Journal of the Optical Society of America A via MedWorm.com MedWorm.com provides a medical RSS filtering service. Over 6000 RSS medical sources are combined and output via different filters. This feed contains the latest items from the 'Journal of the Optical Society of America A' source. Thu, 09 Feb 2012 20:29:25 +0100 Comparison of two scanning instruments to measure peripheral refraction in the human eye http://www.medworm.com/index.php?rid=5674171&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-3-258 To better understand how peripheral refraction affects development of myopia in humans, specialized instruments are fundamental for precise and rapid measurements of refraction over the visual field. We compare here two prototype instruments that measure in a few seconds the peripheral refraction ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5674171 Fri, 10 Feb 2012 01:10:49 +0100 5674171 Study on the propagation parameters of Bessel–Gaussian beams carrying optical vortices through atmospheric turbulence http://www.medworm.com/index.php?rid=5674170&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-3-251 Based on the integral representation of Bessel function and the extended Huygens–Fresnel principle, an integral expression of the Wigner distribution function (WDF) for partially coherent Bessel–Gaussian beams (PBGBs) propagating through turbulent atmosphere has been obtained. Also, ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5674170 Fri, 10 Feb 2012 01:10:49 +0100 5674170 Reconstruction in interferometric synthetic aperture microscopy: comparison with optical coherence tomography and digital holographic microscopy http://www.medworm.com/index.php?rid=5674175&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-3-244 It is shown that the spatial frequencies recorded in interferometric synthetic aperture microscopy do not correspond to exact backscattering [as they do in unistatic synthetic aperture radar (SAR)] and that the reconstruction process based on SAR is therefore based on an approximation. The spatial ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5674175 Thu, 09 Feb 2012 05:00:00 +0100 5674175 Toward a cylindrical cloak via inverse homogenization http://www.medworm.com/index.php?rid=5674174&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-3-239 An effective cylindrical cloak may be conceptualized as an assembly of adjacent local neighborhoods, each of which is made from a homogenized composite material (HCM). The HCM is required to be a certain uniaxial dielectric-magnetic material, characterized by positive-definite constitutive dyadics. ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5674174 Thu, 09 Feb 2012 05:00:00 +0100 5674174 Modeling the diffuse reflectance due to a narrow beam incident on a turbid medium http://www.medworm.com/index.php?rid=5674173&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-3-231 We present a model for the diffuse reflectance when a continuous beam is incident normally on a half space composed of a uniform scattering and absorbing medium. This model is the result of an asymptotic analysis of the radiative transport equation for strong scattering, weak absorption, and a ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5674173 Thu, 09 Feb 2012 05:00:00 +0100 5674173 High-efficiency x-ray gratings with asymmetric-cut multilayers http://www.medworm.com/index.php?rid=5674172&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-3-216 We present the fabrication and analysis of efficient and highly dispersive gratings for the x-ray and extreme ultraviolet (EUV) regime. We show that an asymmetric-cut multilayer structure can act as a near-perfect blazed grating. The precision and high line density are achieved by layer deposition ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5674172 Thu, 09 Feb 2012 05:00:00 +0100 5674172 Study of incident angle dependence for dual-band double negative-index material using elliptical nanohole arrays http://www.medworm.com/index.php?rid=5674178&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-3-209 This article, it is believed for the first time, analyzes the scattering coefficients and displacement ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5674178 Wed, 08 Feb 2012 05:00:00 +0100 5674178 Designation of lenses with a single freeform surface for multiple point sources http://www.medworm.com/index.php?rid=5674177&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-3-200 In this study, the formulation is ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5674177 Wed, 08 Feb 2012 05:00:00 +0100 5674177 Effect of surface plasmons on spectral switching of polychromatic light with Au-double-slit http://www.medworm.com/index.php?rid=5674176&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-3-195 It is shown that the generation of surface plasmons on a metal-dielectric interface, i.e., a Au-double-slit and air interface, appreciably affects the intensity of the diffracted light. With a specific example of Au-double-slit and electro-optic devices before the slits, the spectral switching in ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5674176 Wed, 08 Feb 2012 05:00:00 +0100 5674176 Advanced vibration suppression algorithms in adaptive optics systems http://www.medworm.com/index.php?rid=5674179&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-3-185 Vibration suppression in astronomical adaptive optics (AO) systems has gathered great attention in the context of next-generation instrumentation for current telescopes and future Extremely Large Telescopes. Laser tomographic AO systems require natural guide stars to measure the low-order modes ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5674179 Fri, 03 Feb 2012 05:00:00 +0100 5674179 The Farnsworth Flashlight is not equivalent to the Farnsworth Lantern http://www.medworm.com/index.php?rid=5656877&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A377 The Farnsworth Lantern has been accepted in many occupational applications. Modern instruments purporting to be equivalent were inevitable given the ubiquity of its use. The OPTEC900® (Stereo Optical) has been validated and adopted as an acceptable substitute, although the fail rate is ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5656877 Thu, 02 Feb 2012 05:00:00 +0100 5656877 Domain of metamers exciting intrinsically photosensitive retinal ganglion cells (ipRGCs) and rods http://www.medworm.com/index.php?rid=5656886&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A366 Any stimulus can be described as composed of two components—a fundamental color stimulus that controls the three cone responses and a metameric black that has no effect on cones but can drive photoreceptors other than cones [e.g., rods and melanopsin expressing retinal ganglion cells ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5656886 Wed, 01 Feb 2012 05:00:00 +0100 5656886 Role of eye movements in chromatic induction http://www.medworm.com/index.php?rid=5656885&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A353 There exist large interindividual differences in the amount of chromatic induction [Vis. Res.49, 2261 (2009)10.1016/j.visres.2009.06.015]. One possible reason for these differences between subjects could be differences in subjects’ eye movements. In experiment 1, subjects either had to look ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5656885 Wed, 01 Feb 2012 05:00:00 +0100 5656885 A three-dimensional color space from the 13th century http://www.medworm.com/index.php?rid=5656884&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A346 We present a new commentary on Robert Grosseteste’s De colore, a short treatise that dates from the early 13th century, in which Grosseteste constructs a linguistic combinatorial account of color. In contrast to other commentaries (e.g., Kuehni & Schwarz, Color Ordered: A Survey of Color ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5656884 Wed, 01 Feb 2012 05:00:00 +0100 5656884 The Verriest Lecture: Color lessons from space, time and motion http://www.medworm.com/index.php?rid=5656883&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A337 The appearance of a chromatic stimulus depends on more than the wavelengths composing it. The scientific literature has countless examples showing that spatial and temporal features of light influence the colors we see. Studying chromatic stimuli that vary over space, time, or direction of motion ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5656883 Wed, 01 Feb 2012 05:00:00 +0100 5656883 Quantal and non-quantal color matches: failure of Grassmann’s laws at short wavelengths http://www.medworm.com/index.php?rid=5656882&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A324 Previous studies of color matching found that Grassmann’s laws are not obeyed in the short-wavelength region when the method of maximum saturation matching is compared with Maxwell matching. The first experiment evaluated whether the discrepancy might be due to a discrimination matching ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5656882 Wed, 01 Feb 2012 05:00:00 +0100 5656882 Psychophysical and physiological responses to gratings with luminance and chromatic components of different spatial frequencies http://www.medworm.com/index.php?rid=5656881&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A314 Gratings that contain luminance and chromatic components of different spatial frequencies were used to study the segregation of signals in luminance and chromatic pathways. Psychophysical detection and discrimination thresholds to these compound gratings, with luminance and chromatic components of ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5656881 Wed, 01 Feb 2012 05:00:00 +0100 5656881 Electroretinographic responses to photoreceptor specific sine wave modulation http://www.medworm.com/index.php?rid=5656880&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A306 Electroretinographic responses to cone and rod isolating stimuli and to simultaneous L- and M-cone modulation were measured at different temporal frequencies between 2 and 60 Hz and at two mean luminances using a four primary stimulator. The responses driven by each photoreceptor type had distinct ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5656880 Wed, 01 Feb 2012 05:00:00 +0100 5656880 A tritan Waldo would be easier to detect in the periphery than a red/green one: evidence from visual search http://www.medworm.com/index.php?rid=5656879&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A298 In a color naming task from 0° to 55° eccentricity, we found that red/green performance (n=10 subjects) declines around 40° eccentricity, 5° earlier than does tritan performance (main effect of color, p=0.009; eccentricity, p (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5656879 Wed, 01 Feb 2012 05:00:00 +0100 5656879 Color discrimination across four life decades assessed by the Cambridge Colour Test http://www.medworm.com/index.php?rid=5656878&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A290 Color discrimination was estimated using the Cambridge Colour Test (CCT) in 160 normal trichromats of four life decades, 20–59 years of age. For each age cohort, medians and tolerance limits of the CCT parameters are tabulated. Compared across the age cohorts (Kruskal–Wallis test), ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5656878 Wed, 01 Feb 2012 05:00:00 +0100 5656878 Quantal and non-quantal color matches: failure of Grassmann’s laws at short wavelengths http://www.medworm.com/index.php?rid=5656887&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A327 Previous studies of color matching found that Grassmann’s laws are not obeyed in the short-wavelength region when the method of maximum saturation matching is compared with Maxwell matching. The first experiment evaluated whether the discrepancy might be due to a discrimination matching ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5656887 Tue, 31 Jan 2012 05:00:00 +0100 5656887 Color discrimination across four life decades assessed by the Cambridge Colour Test http://www.medworm.com/index.php?rid=5656888&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A293 Color discrimination was estimated using the Cambridge Colour Test (CCT) in 160 normal trichromats of four life decades, 20–59 years of age. For each age cohort, medians and tolerance limits of the CCT parameters are tabulated. Compared across the age cohorts (Kruskal–Wallis test), ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5656888 Mon, 30 Jan 2012 05:00:00 +0100 5656888 Systematic violations of von Kries rule reveal its limitations for explaining color and lightness constancy http://www.medworm.com/index.php?rid=5635701&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A275 Cone contrast remains constant, when the same object/background is seen under different illuminations—the von Kries rule [Shevell, Vis. Res. 18, 1649 (1978)]. Here we explore this idea using asymmetric color matching. We find that von Kries adaptation holds, regardless of whether chromatic ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5635701 Sat, 28 Jan 2012 01:35:15 +0100 5635701 Color Vision: Introduction http://www.medworm.com/index.php?rid=5635700&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2- [J. Opt. Soc. Am. A 29, - (2012)] (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5635700 Sat, 28 Jan 2012 01:35:15 +0100 5635700 Contrast edge colors under different natural illuminations http://www.medworm.com/index.php?rid=5635705&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A240 Essential to sensory processing in the human visual system is natural illumination, which can vary considerably not only across space but also along the day depending on the atmospheric conditions and the sun’s position in the sky. In this work, edges derived from the three postreceptoral ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5635705 Fri, 27 Jan 2012 05:00:00 +0100 5635705 Context-dependent judgments of color that might allow color constancy in scenes with multiple regions of illumination http://www.medworm.com/index.php?rid=5635704&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A247 For a color-constant observer, a change in the spectral composition of the illumination is accompanied by a corresponding change in the chromaticity associated with an achromatic percept. However, maintaining color constancy for different regions of illumination within a scene implies the ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5635704 Fri, 27 Jan 2012 05:00:00 +0100 5635704 Do color appearance judgments interfere with detection of small threshold stimuli? http://www.medworm.com/index.php?rid=5635703&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A258 The application of adaptive optics to vision science creates the potential to directly probe the link between the retinal mosaic and visual perception. However, interrogation on a cellular level requires small, threshold stimuli and therefore an implicit detection model. Unfortunately the ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5635703 Fri, 27 Jan 2012 05:00:00 +0100 5635703 Hypoxia, color vision deficiencies, and blood oxygen saturation http://www.medworm.com/index.php?rid=5635702&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A268 Chromatic thresholds were measured using the Cambridge Colour Test (CCT), the Colour Assessment and Diagnosis (CAD) test, and the Cone Specific Contrast Test (CSCT) at ground and 3780 m (12 400 ft) for subjects with normal color vision and red-green color vision defects. The CAD revealed a small ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5635702 Fri, 27 Jan 2012 05:00:00 +0100 5635702 Influence of the correlated color temperature of a light source on the color discrimination capacity of the observer http://www.medworm.com/index.php?rid=5635714&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A209 It is well known that there are different preferences in correlated color temperature of light sources for daily living activities or for viewing artistic paintings. There are also data relating the capacity of observers to make judgments on color differences with the spectral power distribution of ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5635714 Thu, 26 Jan 2012 05:00:00 +0100 5635714 Predicting frequency of metamerism in natural scenes by entropy of colors http://www.medworm.com/index.php?rid=5635713&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A200 Estimating the frequency of metameric surfaces in natural scenes usually requires many comparisons of surface colors to determine which are visually indistinguishable under one light but distinguishable—by a certain criterion degree—under another. The aim here was to test the ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5635713 Thu, 26 Jan 2012 05:00:00 +0100 5635713 Visual search in natural scenes explained by local color properties http://www.medworm.com/index.php?rid=5635712&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A194 Success in visually searching for a small object or target in a natural scene depends on many factors, including the spatial structure of the scene and the pattern of observers’ eye movements. The aim of this study was to determine to what extent local color properties of natural scenes can ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5635712 Thu, 26 Jan 2012 05:00:00 +0100 5635712 Lateral suppression of mesopic rod and cone flicker detection http://www.medworm.com/index.php?rid=5635711&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A188 This study investigated the mechanisms of flicker detection suppression by measuring mesopic rod and cone critical flicker frequencies (CFFs) at different center and surround illuminance levels. Stimuli were generated with a four-primary photostimulator that provided independent control of rod and ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5635711 Thu, 26 Jan 2012 05:00:00 +0100 5635711 A chromatic diversity index based on complex scenes http://www.medworm.com/index.php?rid=5635710&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A174 We propose a chromatic diversity index based on the Munsell set capable of predicting illuminant induced changes in chromatic diversity of complex scenes. The color differences between complex scenes derived from hyperspectral data under a test and under a reference CIE D65 illuminant were computed ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5635710 Thu, 26 Jan 2012 05:00:00 +0100 5635710 Uniform color spaces and natural image statistics http://www.medworm.com/index.php?rid=5635709&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A182 Many aspects of visual coding have been successfully predicted by starting from the statistics of natural scenes and then asking how the stimulus could be efficiently represented. We started from the representation of color characterized by uniform color spaces, and then asked what type of color ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5635709 Thu, 26 Jan 2012 05:00:00 +0100 5635709 Effect of luminosity on color discrimination of dichromatic marmosets (Callithrix jacchus) http://www.medworm.com/index.php?rid=5635708&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A216 Psychophysical data have shown that under mesopic conditions cones and rods can interact, improving color vision. Since electrophysiological data have suggested that rods of dichromatic marmosets appear to be active at higher luminance, we aimed to investigate the effect of different levels of ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5635708 Thu, 26 Jan 2012 05:00:00 +0100 5635708 Spatial distributions of cone inputs to cells of the parvocellular pathway investigated with cone-isolating gratings http://www.medworm.com/index.php?rid=5635707&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A223 Receptive fields of midget ganglion cells and parvocellular lateral geniculate nucleus (LGN) neurons show color-opponent responses because they receive antagonistic input from the middle- and long-wavelength sensitive cones. It has been controversial as to whether this opponency can derive from ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5635707 Thu, 26 Jan 2012 05:00:00 +0100 5635707 The relationship between peripherally matched invariant hues and unique hues: a cone-contrast approach http://www.medworm.com/index.php?rid=5635706&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A233 A characteristic shift in hue and saturation occurs when colored targets are viewed peripherally compared with centrally. Four hues, one in each of the red, blue, green, and yellow regions of color space, remain unchanged when presented in the peripheral field. Apart from green, these peripherally ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5635706 Thu, 26 Jan 2012 05:00:00 +0100 5635706 Psychophysical optimization of lighting spectra for naturalness, preference, and chromatic diversity http://www.medworm.com/index.php?rid=5656889&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A144 The optimal spectral profiles of lighting for naturalness, individual preference, and chromatic diversity were estimated with psychophysical experiments in which observers selected illuminants from a set of metamers of D65 to render outdoor and indoor scenes. For naturalness, the illuminant ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5656889 Wed, 25 Jan 2012 05:00:00 +0100 5656889 Contrast adaptation reveals increased organizational complexity of chromatic processing in the visual evoked potential http://www.medworm.com/index.php?rid=5635717&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A152 Results from psychophysics and single-unit recordings suggest that color vision comprises multiple stages of processing. Postreceptoral channels appear to consist of both a stage of broadly tuned opponent channels that compare cone signals and a subsequent stage, which includes cells tuned to many ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5635717 Wed, 25 Jan 2012 05:00:00 +0100 5635717 Cardinal axes are not independent in color discrimination http://www.medworm.com/index.php?rid=5635716&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A157 We measured chromatic discrimination under conditions where the target fields could be distinguished only by the ratio of excitation of the long- (L) and middle-wavelength (M) cones. The excitation level of the short-wavelength (S) cones was varied in the experiments, although for any given ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5635716 Wed, 25 Jan 2012 05:00:00 +0100 5635716 Tests of a functional account of the Abney effect http://www.medworm.com/index.php?rid=5635715&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A165 The Abney effect refers to changes in the hue of lights as they are desaturated. Normally the purity is varied by desaturating with a fixed spectrum. Mizokami et al. [J. Vis.6, 996 (2006)10.1167/6.9.121534-7362] instead varied purity by using Gaussian spectra and increasing their bandwidth. ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5635715 Wed, 25 Jan 2012 05:00:00 +0100 5635715 Psychophysical optimization of lighting spectra for naturalness, preference, and chromatic diversity http://www.medworm.com/index.php?rid=5625022&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A144 The optimal spectral profiles of lighting for naturalness, individual preference, and chromatic diversity were estimated with psychophysical experiments in which observers selected illuminants from a set of metamers of D65 to render outdoor and ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5625022 Wed, 25 Jan 2012 02:26:59 +0100 5625022 Contrast adaptation reveals increased organizational complexity of chromatic processing in the visual evoked potential http://www.medworm.com/index.php?rid=5625023&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A153 Results from psychophysics and single-unit recordings suggest that color vision comprises multiple stages of processing. Postreceptoral channels appear to consist of both a stage of broadly tuned opponent channels that compare cone signals and a subsequent stage, which includes cells tuned to many ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5625023 Mon, 23 Jan 2012 05:00:00 +0100 5625023 Experimental comparison of performance degradation from terahertz and infrared wireless links in fog http://www.medworm.com/index.php?rid=5635718&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-179 We describe a lab setup for analyzing impairments of terahertz (THz) and infrared (IR) free space links caused by local refraction index changes in the signal’s propagation paths that could be induced by turbulence, particles, humidity, etc. A THz signal comprising a 2.5??Gb/s data load ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5635718 Thu, 19 Jan 2012 05:00:00 +0100 5635718 Estimating illuminant color based on luminance balance of surfaces http://www.medworm.com/index.php?rid=5617297&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A133 In this study we showed whether color constancy ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5617297 Thu, 19 Jan 2012 05:00:00 +0100 5617297 Feature binding of a continuously changing object http://www.medworm.com/index.php?rid=5604305&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A128 Consider a feature of a stimulus (such as color, luminance, or spatial frequency) that changes over time along a continuum. When a second stimulus is briefly pulsed with the same feature value as the first stimulus, the two stimuli are not perceived to match. Instead, the continuously changing ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5604305 Thu, 19 Jan 2012 02:02:33 +0100 5604305 Effect of spatial structure on colorfulness adaptation for natural images http://www.medworm.com/index.php?rid=5604304&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A118 We examined whether the perception of the colorfulness of an image is influenced by the adaptation of the visual system to natural and shuffled images with different degrees of saturation. In the experiment, observers first became adapted to several images with different levels of saturation and ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5604304 Thu, 19 Jan 2012 02:02:33 +0100 5604304 The perceptual balance of color http://www.medworm.com/index.php?rid=5604306&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A108 We examined how this perceptual balance is adjusted by adaptation to the contrast in images. Observers set the level of L vs. M ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5604306 Tue, 17 Jan 2012 05:00:00 +0100 5604306 Blue–green color categorization in Mandarin–English speakers http://www.medworm.com/index.php?rid=5593562&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A102 Observers are faster to detect a target among a set of distracters if the targets and distracters come from different color categories. This cross-boundary advantage seems to be limited to the right visual field, which is consistent with the dominance of the left hemisphere for language processing ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5593562 Mon, 16 Jan 2012 03:34:06 +0100 5593562 Determination of unit normal vectors of aspherical surfaces given unit directional vectors of incoming and outgoing rays http://www.medworm.com/index.php?rid=5593561&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-174 Snell’s law describes the relationship between the incidence angle and reflection (or refraction) angle of a light ray impinging on the interface between two different isotropic media. In this paper, Snell’s law is used to derive the unit normal vectors of an aspherical surface given ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5593561 Mon, 16 Jan 2012 03:34:06 +0100 5593561 Real-world stimuli show perceived hue shifts in the peripheral visual field http://www.medworm.com/index.php?rid=5593569&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A96 Certain hues undergo shifts in their appearance when they are viewed by the peripheral retina. This has often been shown on a 3-primary color CRT monitor. To investigate the possible role of metamerism, we replicated our peripheral color matching experiments using Munsell paper stimuli viewed under ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5593569 Fri, 13 Jan 2012 05:00:00 +0100 5593569 1/f noise in human color vision: the role of S-cone signals http://www.medworm.com/index.php?rid=5593568&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A82 We examine the functional role of S-cone signals on reaction time (RT) variability in human color vision. Stimuli were selected along red–green and blue–yellow cardinal directions and at random directions in the isoluminant plane of the color space. Trial-to-trial RT variability was ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5593568 Fri, 13 Jan 2012 05:00:00 +0100 5593568 Direction in the color plane as a factor in chromatic flicker and chromatic motion http://www.medworm.com/index.php?rid=5593567&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A74 A percept of motion results when a chromatic grating, formed from a spatial alternation between two isoluminant hues, drifts across the visual field. With hue pairs chosen to be equally subjectively dissimilar, the motion is greater for alternation along some directions in color space (orange/blue) ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5593567 Fri, 13 Jan 2012 05:00:00 +0100 5593567 Chromatic visual evoked potential responses in preschool children http://www.medworm.com/index.php?rid=5593566&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A69 The purpose of the study was to analyze chromatic visual evoked potential (VEP) responses to isoluminant red–green (R–G) and blue–yellow (B–Y) stimuli in 30 preschool children (1.5–6??years). The predominant part of the response consisted of a positive (P) wave, ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5593566 Fri, 13 Jan 2012 05:00:00 +0100 5593566 Hue discrimination, unique hues and naming http://www.medworm.com/index.php?rid=5593565&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A60 The hue discrimination curve (HDC) that characterizes performances over the entire hue circle was determined by using sinusoidally modulated spectral power distributions of 1.5?c/300??nm with fixed amplitude and twelve reference phases. To investigate relationship between hue discrimination and ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5593565 Fri, 13 Jan 2012 05:00:00 +0100 5593565 Individual differences in simultaneous color constancy are related to working memory http://www.medworm.com/index.php?rid=5593564&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A52 Few studies have investigated the possible role of higher-level cognitive mechanisms in color constancy. Following up on previous work with successive color constancy [J. Exper. Psychol. Learn. Mem. Cogn.37, 1014 (2011)10.1037/a0023257JEPCEA0278-7393], the current study examined the relation ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5593564 Fri, 13 Jan 2012 05:00:00 +0100 5593564 Color appearance at ±10° along the vertical and horizontal meridians http://www.medworm.com/index.php?rid=5593563&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A44 Hue-scaling data were collected from three observers using the “4+1” color-naming procedure for circular (0.25°–5°), monochromatic (440–660 nm) stimuli. Stimuli were presented at ±10° along the vertical and horizontal meridians under conditions ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5593563 Fri, 13 Jan 2012 05:00:00 +0100 5593563 Intensity fluctuations of flat-topped beam in non-Kolmogorov weak turbulence http://www.medworm.com/index.php?rid=5593570&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-169 Results obtained on the intensity fluctuations of flat-topped Gaussian beams in weakly turbulent non-Kolmogorov horizontal atmospheric optics links are represented. Effects on the scintillation index of the power law α that describes the non-Kolmogorov spectrum are examined. Our results ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5593570 Tue, 10 Jan 2012 05:00:00 +0100 5593570 Mean level signal crossing rate for an arbitrary stochastic process: reply to comment http://www.medworm.com/index.php?rid=5593575&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-167 Harold T. Yura, Steen G. Hanson [J. Opt. Soc. Am. A 29, 167-168 (2012)] (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5593575 Mon, 09 Jan 2012 05:00:00 +0100 5593575 Mean level signal crossing rate for an arbitrary stochastic process: comment http://www.medworm.com/index.php?rid=5593574&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-164 In J. Opt. Soc. Am. A27, 797 (2010), Yura and Hanson derived what they claim to be “a general expression for the mean level crossing rate for an arbitrary” random process following any desired probability distribution function. On the other hand, the authors themselves assert that in ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5593574 Mon, 09 Jan 2012 05:00:00 +0100 5593574 Rod hue biases produced on CRT displays http://www.medworm.com/index.php?rid=5593573&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A36 Studies of rod hue biases using monochromatic stimuli have shown that rod stimulation can shift the balance of hues at mesopic light levels. We found that the CRT display produced all three previously identified rod hue biases, which shifted the loci of all four unique hues at low mesopic light ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5593573 Mon, 09 Jan 2012 05:00:00 +0100 5593573 Mean level signal crossing rate for an arbitrary stochastic process: reply to comment http://www.medworm.com/index.php?rid=5593572&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-4 Harold T. Yura, Steen G. Hanson [J. Opt. Soc. Am. A 29, 4-5 (2012)] (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5593572 Mon, 09 Jan 2012 05:00:00 +0100 5593572 Mean level signal crossing rate for an arbitrary stochastic process: comment http://www.medworm.com/index.php?rid=5593571&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-1 In J. Opt. Soc. Am. A27, 797 (2010), Yura and Hanson derived what they claim to be “a general expression for the mean level crossing rate for an arbitrary” random process following any desired probability distribution function. On the other hand, the authors themselves assert that in ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5593571 Mon, 09 Jan 2012 05:00:00 +0100 5593571 Intensity fluctuations of flat-topped beam in non-Kolmogorov weak turbulence http://www.medworm.com/index.php?rid=5569224&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A36 Results obtained on the intensity fluctuations of flat-topped Gaussian beams in weakly turbulent non-Kolmogorov horizontal atmospheric optics links are represented. Effects on the scintillation index of the power law α that describes the non-Kolmogorov spectrum are examined. Our results ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5569224 Fri, 06 Jan 2012 05:00:00 +0100 5569224 Changes in color vision with decreasing light level: separating the effects of normal aging from disease http://www.medworm.com/index.php?rid=5569223&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A27 The purpose of this study was to obtain additional information about the health of the retina (HR) by measuring the rate of loss of chromatic sensitivity with decreasing light level. The HR_index is introduced to separate the effects of normal aging from early stage disease. For normal subjects the ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5569223 Fri, 06 Jan 2012 05:00:00 +0100 5569223 Self-consistent optical constants of sputter-deposited B_4C thin films http://www.medworm.com/index.php?rid=5533930&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-1-117 The optical constants of ion-beam-sputtered B_4C films have been measured by ellipsometry in the 190–950?nm range. The set of data has been extended toward both shorter and longer wavelengths with data in the literature, along with interpolations and extrapolations, in order to obtain a ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5533930 Thu, 22 Dec 2011 05:00:00 +0100 5533930 Mesopic rod and S-cone interactions revealed by modulation thresholds http://www.medworm.com/index.php?rid=5533929&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A19 We analyzed mesopic rod and S-cone interactions in terms of their contributions to the blue–yellow opponent pathway. Stimuli were generated using a four-primary colorimeter. Mixed rod and S-cone modulation thresholds (constant L-, M-cone excitation) were measured as a function of their phase ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5533929 Thu, 22 Dec 2011 05:00:00 +0100 5533929 Phase retrieval via spatial light modulator phase modulation in 4f optical setup: numerical inverse imaging with sparse regularization for phase and amplitude http://www.medworm.com/index.php?rid=5520764&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-1-105 The 4f optical setup is considered with a wave field modulation by a spatial light modulator located in the focal plane of the first lens. Phase as well as amplitude of the wave field are reconstructed from noisy multiple-intensity observations. The reconstruction is optimal due to a constrained ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5520764 Mon, 19 Dec 2011 05:00:00 +0100 5520764 Rigorous analysis of whispering gallery mode frequency conversion because of time variation of refractive index in a spherical resonator http://www.medworm.com/index.php?rid=5492790&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-1-99 We investigate theoretically the switching effects for the whispering gallery modes in a spherical dielectric resonator when its material is subject to abrupt time change in permittivity. A rigorous analytical approach is used to study the transformation process. Details of both the transient ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5492790 Sun, 11 Dec 2011 15:11:50 +0100 5492790 Polarization ellipse and Stokes parameters in geometric algebra http://www.medworm.com/index.php?rid=5492789&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-1-89 In this paper, we use geometric algebra to describe the polarization ellipse and Stokes parameters. We show that a solution to Maxwell’s equation is a product of a complex basis vector in Jackson and a linear combination of plane wave functions. We convert both the amplitudes and the wave ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5492789 Sun, 11 Dec 2011 15:11:50 +0100 5492789 Method for estimating the relative contribution of phase and power spectra to the total information in natural-scene patches http://www.medworm.com/index.php?rid=5533931&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-1-55 A wide variety of recent studies have argued that the human visual system provides an efficient means of processing the information in the natural environment. However, the amount of information (entropy) in the signal can be estimated in a number ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5533931 Wed, 07 Dec 2011 05:00:00 +0100 5533931 Effect of spatial coherence on scattering from optically inhomogeneous media http://www.medworm.com/index.php?rid=5483618&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-1-85 The properties of light scattered from material systems depend on the characteristics of input optical fields. We study numerically the effect of the state of spatial coherence on the properties of scattered fields. Using a customized coupled dipole technique, we demonstrate that this influence ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5483618 Wed, 07 Dec 2011 05:00:00 +0100 5483618 Coherence effects in Mie scattering http://www.medworm.com/index.php?rid=5483617&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-1-78 The scattering of a partially coherent beam by a deterministic, spherical scatterer is studied. In particular, the Mie scattering by a Gaussian Schell-model beam is analyzed. Expressions are derived for (a) the extinguished power, (b) the radiant intensity of the scattered field, and (c) the ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5483617 Wed, 07 Dec 2011 05:00:00 +0100 5483617 Design of a general point focusing crystal geometry for x-ray spectroscopy http://www.medworm.com/index.php?rid=5483616&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-1-68 A nearly exact general equation for geometrical angular deviations from the Bragg angle over entire curved crystal surfaces is derived using a toroidally curvilinear coordinate system and applied on the nine conventional crystal geometries. Although the derived formula confirms Wittry’s ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5483616 Wed, 07 Dec 2011 05:00:00 +0100 5483616 Method for estimating the relative contribution of phase and power spectra to the total information in natural-scene patches http://www.medworm.com/index.php?rid=5483615&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-1-55 A wide variety of recent studies have argued that the human visual system provides an efficient means of processing the information in the natural environment. However, the amount of information (entropy) in the signal can be estimated in a number of ways, and it is has been unclear how much of the ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5483615 Wed, 07 Dec 2011 05:00:00 +0100 5483615 Multipole theory for tight focusing of polarized light, including radially polarized and other special cases http://www.medworm.com/index.php?rid=5483614&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-1-32 A multipole expansion, based on spherical harmonics, provides an efficient method for calculating the field in the focal region of a lens for radially polarized illumination, or other illumination polarization and phase distributions, including vortex beams. The multipole approach also has the ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5483614 Wed, 07 Dec 2011 05:00:00 +0100 5483614 Multiple scattering of electromagnetic waves by an aggregate of uniaxial anisotropic spheres http://www.medworm.com/index.php?rid=5483613&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-1-22 An exact analytical solution is obtained for the scattering of electromagnetic waves from a plane wave with arbitrary directions of propagation and polarization by an aggregate of interacting homogeneous uniaxial anisotropic spheres with parallel primary optical axes. The expansion coefficients of ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5483613 Wed, 07 Dec 2011 05:00:00 +0100 5483613 High-accuracy wave field reconstruction: decoupled inverse imaging with sparse modeling of phase and amplitude http://www.medworm.com/index.php?rid=5483619&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-1-44 We apply a nonlocal adaptive spectral transform for sparse modeling of phase and amplitude of a coherent wave field. The reconstruction of this wave field from complex-valued Gaussian noisy observations is considered. The problem is formulated as a multiobjective constrained optimization. The ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5483619 Tue, 06 Dec 2011 05:00:00 +0100 5483619 Specularity and shadow detection for the multisource photometric reconstruction of a textured surface http://www.medworm.com/index.php?rid=5465426&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-1-11 Textured surface analysis is essential for many applications. In this paper, we present a three-dimensional (3D) recovery approach for real textured surfaces based on photometric stereo. The aim is to be able to reconstruct the textured surfaces in 3D with a high degree of accuracy. For this, the ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5465426 Fri, 02 Dec 2011 05:00:00 +0100 5465426 Convergence analysis and oscillations in the method of fictitious sources applied to dielectric scattering problems http://www.medworm.com/index.php?rid=5465425&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-1-1 Several wave scattering phenomena in optics are modeled by the method of fictitious sources (MFS). Despite its interesting features, the effectiveness of the MFS and its applicability are restricted by open issues, including the placement of the fictitious sources (FS) and the fields’ ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5465425 Fri, 02 Dec 2011 05:00:00 +0100 5465425 Partial polarization in three dimensions http://www.medworm.com/index.php?rid=5454339&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-12-2655 Various different parameters have been introduced to describe the degree of polarization of a partially polarized electromagnetic field in three dimensions. Of these, parameters based on the eigenvalues of the coherency matrix are invariant under a unitary transformation. Here, explicit expressions ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5454339 Mon, 28 Nov 2011 05:00:00 +0100 5454339 Electromagnetic plane-wave pulse transmission into a Lorentz half-space http://www.medworm.com/index.php?rid=5454338&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-12-2647 The propagation of an electromagnetic plane-wave signal obliquely incident upon a Lorentz half-space is studied analytically. Time-domain asymptotic expressions that increase in accuracy with propagation distance are derived by application of uniform saddle point methods on the ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5454338 Mon, 28 Nov 2011 05:00:00 +0100 5454338 Aberrations and spherocylindrical powers within subapertures of freeform surfaces http://www.medworm.com/index.php?rid=5437510&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-12-2642 A method is described for the derivation of refractive properties and aberration structure of subapertures of freeform surfaces. Surface shapes are described in terms of Zernike polynomials. The method utilizes matrices to transform between Zernike and Taylor coefficients. Expression as a Taylor ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5437510 Wed, 23 Nov 2011 13:39:34 +0100 5437510 Is the Kanizsa illusion triggered by the simultaneous contrast mechanism? http://www.medworm.com/index.php?rid=5437512&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-12-2629 Current illusory contour models do not predict the disappearance of the Kanizsa illusion due to specific spatial luminance distributions within the inducers. We suggest that these stimulus conditions are characterized by an insufficient amount of induced brightness. Our model’s core ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5437512 Wed, 23 Nov 2011 05:00:00 +0100 5437512 Are Gaussian spectra a viable perceptual assumption in color appearance? http://www.medworm.com/index.php?rid=5437511&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A10 Natural illuminant and reflectance spectra can be roughly approximated by a linear model with as few as three basis functions, and this has suggested that the visual system might construct a linear representation of the spectra by estimating the weights of these functions. However, such models do ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5437511 Wed, 23 Nov 2011 05:00:00 +0100 5437511 Caustics in a meridional plane produced by plano-convex conic lenses http://www.medworm.com/index.php?rid=5428495&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-12-2619 We study the formation of caustic surfaces formed in both convex-plano and plano-convex conic lenses by considering a plane wave incident on the lens along the optical axis. By using the caustic formulas and a paraxial approximation, we derive analytic expressions to evaluate the spherical ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5428495 Sun, 20 Nov 2011 13:57:13 +0100 5428495 Probabilistic 3D object recognition and pose estimation using multiple interpretations generation http://www.medworm.com/index.php?rid=5418117&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-12-2607 This paper presents a probabilistic object recognition and pose estimation method using multiple interpretation generation in cluttered indoor environments. How to handle pose ambiguity and uncertainty is the main challenge in most recognition systems. In order to solve this problem, we approach it ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5418117 Fri, 18 Nov 2011 04:17:24 +0100 5418117 Middle- and long-wavelength discrimination declines with rod photopigment regeneration http://www.medworm.com/index.php?rid=5418116&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-12-2600 Hue-discrimination functions were derived from hue-naming data (480–620?nm, 20?nm steps) obtained in 4?min intervals from 4?min to 28?min postbleach at 10° temporal retinal eccentricity. Hue-naming data were also obtained in the fovea. Hue-discrimination functions derived at the 4, 8, ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5418116 Fri, 18 Nov 2011 04:17:24 +0100 5418116 Fault detection in metallic grid scattering http://www.medworm.com/index.php?rid=5418121&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-12-2588 The canonical problem of detecting and localizing missing scatterers (faults) inside a known grid of small cross section perfect electric conducting cylinders is dealt with. The case of a TM scalar two-dimensional geometry is considered. The scattering by a fault is modeled as the radiation of a ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5418121 Thu, 17 Nov 2011 05:00:00 +0100 5418121 Scattering of a transversely confined Neumann beam by a spherical particle http://www.medworm.com/index.php?rid=5418120&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-12-2577 Various properties of an electromagnetic wave whose spherical multipole expansion contains only Riccati–Neumann functions are examined. In particular, the novel behavior of the beam phase during diffractive spreading is discussed. When a Neumann beam is scattered by a spherical particle, the ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5418120 Thu, 17 Nov 2011 05:00:00 +0100 5418120 Impact of finite receiver-aperture size in a non-line-of-sight single-scatter propagation model http://www.medworm.com/index.php?rid=5418119&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-12-2568 In this paper, a single-scatter propagation model is developed that expands the classical model by considering a finite receiver-aperture size for non-line-of-sight communication. The expanded model overcomes some of the difficulties with the classical model, most notably, inaccuracies in scenarios ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5418119 Thu, 17 Nov 2011 05:00:00 +0100 5418119 Self-calibrating technique for terahertz time-domain material parameter extraction http://www.medworm.com/index.php?rid=5418118&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-12-2561 This manuscript introduces a self-calibrating technique for terahertz (THz) time-domain material characterization in transmission mode. The self-calibrating technique utilizes the relations between the multiple transmissions of a transient plane wave through a sample under test in order to extract ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5418118 Thu, 17 Nov 2011 05:00:00 +0100 5418118 Zernike–Galerkin method: efficient computational tool for elastically deformable optics http://www.medworm.com/index.php?rid=5418122&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-12-2554 We present the Zernike–Galerkin method, a tool for the discretization of partial differential equations (PDEs) on thin membranes in polar coordinates. The use of a truncated Zernike series as ansatz yields a semianalytical compact and parametric solution of the PDE. We demonstrate its use ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5418122 Wed, 16 Nov 2011 05:00:00 +0100 5418122 Scaling law for computational imaging using spherical optics http://www.medworm.com/index.php?rid=5418124&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-12-2540 The resolution of a camera system determines the fidelity of visual features in captured images. Higher resolution implies greater fidelity and, thus, greater accuracy when performing automated vision tasks, such as object detection, recognition, and tracking. However, the resolution of any camera ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5418124 Tue, 15 Nov 2011 05:00:00 +0100 5418124 Chromatic discrimination: differential contributions from two adapting fields http://www.medworm.com/index.php?rid=5418123&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-29-2-A1 To test whether a retinal or cortical mechanism sums contributions from two adapting fields to chromatic discrimination, L/M discrimination was measured with a test annulus surrounded by an inner circular field and an outer rectangular field. A retinal summation mechanism predicted that the ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5418123 Tue, 15 Nov 2011 05:00:00 +0100 5418123 Detection of chemical interfaces in coherent anti-Stokes Raman scattering microscopy: D-CARS. II. Arbitrary interfaces http://www.medworm.com/index.php?rid=5418128&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-12-2531 We address the general problem of detecting chemical interfaces arbitrarily oriented in space in coherent anti-Stokes Raman scattering (CARS) microscopy. Such a task is accomplished by using a beam reversal scheme, as recently demonstrated experimentally [J. Biomed. Opt.16, 086006 ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5418128 Fri, 11 Nov 2011 05:00:00 +0100 5418128 Detection of chemical interfaces in coherent anti-Stokes Raman scattering microscopy: Dk-CARS. I. Axial interfaces http://www.medworm.com/index.php?rid=5418127&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-12-2519 We develop a full vectorial theoretical investigation of the chemical interface detection in conventional coherent anti-Stokes Raman scattering (CARS) microscopy. In Part I, we focus on the detection of axial interfaces (i.e., parallel to the optical axis) following a recent experimental ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5418127 Fri, 11 Nov 2011 05:00:00 +0100 5418127 Electromagnetic scattering from cylindrical objects above a conductive surface using a hybrid finite-element–surface integral equation method http://www.medworm.com/index.php?rid=5418126&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-12-2510 This work presents a novel finite-element solution to the problem of scattering from a finite and an infinite array of cylindrical objects with arbitrary shapes and materials over perfectly conducting ground planes. The formulation is based on using the surface integral equation with Green’s ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5418126 Fri, 11 Nov 2011 05:00:00 +0100 5418126 Characterizing flash-radiography source spots http://www.medworm.com/index.php?rid=5418125&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-12-2501 Flash radiography of large hydrodynamic experiments driven by high explosives is a venerable diagnostic technique in use at many laboratories. The size of the radiographic source spot is often quoted as an indication of the resolving power of a particular flash-radiography machine. A variety of ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5418125 Fri, 11 Nov 2011 05:00:00 +0100 5418125 Lensless vision system for in-plane positioning of a patterned plate with subpixel resolution http://www.medworm.com/index.php?rid=5397148&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-12-2494 Whereas vision is an efficient way for noncontact sensing of many physical quantities, it assumes a cumbersome imaging system that may be very problematic in confined environments. In such contexts, the design of a compact vision probe can be based on digital holography that is a lensless imaging ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5397148 Fri, 11 Nov 2011 05:00:00 +0100 5397148 Optomechanical imaging system for breast cancer detection http://www.medworm.com/index.php?rid=5397147&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-12-2473 In this report, we describe a new approach to ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5397147 Fri, 11 Nov 2011 05:00:00 +0100 5397147 Diffraction characteristics of optical elements designed as phase layers with cosine-profiled periodicity in the azimuthal direction http://www.medworm.com/index.php?rid=5397152&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-12-2465 The article concerns an investigation of the Fresnel diffraction characteristics of two types of phase optical elements under Gaussian laser beam illumination. Both elements provide an azimuthal periodicity of the phase retardation. The first element possesses azimuthal cosine-profiled phase ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5397152 Thu, 10 Nov 2011 05:00:00 +0100 5397152 Computer simulation study of nonlinear imaging properties for two phase-typed scatterers http://www.medworm.com/index.php?rid=5397151&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-12-2459 Nonlinear imaging of two phase-typed scatterers in super-Gaussian laser beams is modeled and its properties obtained by computer simulation are presented. The formations of hot images and second-order hot images are verified. It is found that the in-beam locations of hot images correspond to those ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5397151 Thu, 10 Nov 2011 05:00:00 +0100 5397151 Derivation of the propagation equations for higher order aberrations of local wavefronts http://www.medworm.com/index.php?rid=5397150&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-12-2442 From the literature the analytical calculation of local power and astigmatism of a wavefront after refraction and propagation is well known; it is, e.g., performed by the Coddington equation for refraction and the classical vertex correction formula for propagation. Recently the authors succeeded ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5397150 Thu, 10 Nov 2011 05:00:00 +0100 5397150 Importance sampling the Rayleigh phase function http://www.medworm.com/index.php?rid=5397149&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-12-2436 Rayleigh scattering is used frequently in Monte Carlo simulation of multiple scattering. The Rayleigh phase function is quite simple, and one might expect that it should be simple to importance sample it efficiently. However, there seems to be no one good way of sampling it in the literature. This ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5397149 Thu, 10 Nov 2011 05:00:00 +0100 5397149 Dispersion analysis of perpendicular modes in anisotropic crystals and layers http://www.medworm.com/index.php?rid=5376021&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-12-2428 Until today dispersion analysis could not be successfully applied to evaluate oscillator parameters of modes that have their transition moments perpendicular to the surface of an anisotropic crystal or a layered medium. The main reason for this failure is that while such modes generate maxima in ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5376021 Fri, 04 Nov 2011 05:00:00 +0100 5376021 Spectral bidirectional reflectance distribution function measurements on well-defined textured surfaces: direct observation of shadowing, masking, inter-reflection, and transparency effects http://www.medworm.com/index.php?rid=5397155&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-11-2414 We present results for the bidirectional reflectance distribution function (BRDF) for samples of uniform rectangular and triangular grooves constructed from polydimethylsilicone replicas. The measurements are performed with the detector in the plane of incidence, but with varying groove ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5397155 Mon, 31 Oct 2011 05:00:00 +0100 5397155 Code aperture optimization for spectrally agile compressive imaging http://www.medworm.com/index.php?rid=5397154&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-11-2400 Coded aperture snapshot spectral imaging (CASSI) provides a mechanism for capturing a 3D spectral cube with a single shot 2D measurement. In many applications selective spectral imaging is sought since relevant information often lies within a subset of spectral bands. Capturing and reconstructing ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5397154 Mon, 31 Oct 2011 05:00:00 +0100 5397154 Spectral color constancy using a maximum entropy approach http://www.medworm.com/index.php?rid=5397153&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-11-2385 This paper proposes a solution to the spectral color constancy problem. The method is based on a statistical model for the surface reflectance spectrum and applies a maximum entropy constraint. Unlike prior methods based on linear models, the solution process does not require a set of basis ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5397153 Mon, 31 Oct 2011 05:00:00 +0100 5397153 Integral imaging using phase-only LCoS spatial light modulators as Fresnel lenslet arrays http://www.medworm.com/index.php?rid=5397156&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-11-2359 We present a digital integral imaging system. A Fresnel lenslet array pattern is written on a phase-only LCoS spatial light modulator device (SLM) to replace the regular analog lenslet array in a conventional integral imaging system. We ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5397156 Thu, 27 Oct 2011 05:00:00 +0100 5397156 Electromagnetic plane wave scattering by arbitrarily oriented elliptical dielectric cylinders http://www.medworm.com/index.php?rid=5355687&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-11-2376 The electromagnetic scattering by an arbitrarily oriented elliptical cylinder having different constitutive parameters than those of the background medium is treated in this work. The separation of variables method is used to solve this problem, but, due to the oblique incidence of the source ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5355687 Thu, 27 Oct 2011 05:00:00 +0100 5355687 Integral imaging using phase-only LCoS spatial light modulators as Fresnel lenslet arrays http://www.medworm.com/index.php?rid=5355686&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-11-2359 We present a digital integral imaging system. A Fresnel lenslet array pattern is written on a phase-only LCoS spatial light modulator device (SLM) to replace the regular analog lenslet array in a conventional integral imaging system. We theoretically analyze the capture part of the proposed system ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5355686 Thu, 27 Oct 2011 05:00:00 +0100 5355686 Resolution improvement by single-exposure superresolved interferometric microscopy with a monochrome sensor http://www.medworm.com/index.php?rid=5355690&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-11-2346 Single-exposure superresolved interferometric microscopy (SESRIM) by RGB multiplexing has recently been proposed as a way to achieve one-dimensional superresolved imaging in digital holographic microscopy by a single-color CCD snapshot [Opt. Lett.36, 885 (2011)10.1364/OL.36.000885]. Here we provide ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5355690 Wed, 26 Oct 2011 05:00:00 +0100 5355690 Self-consistent optical constants of SiC thin films http://www.medworm.com/index.php?rid=5355689&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-11-2340 The optical constants of ion-beam-sputtered SiC films have been measured by ellipsometry in the 190 to 950?nm range. The set of data has been extended both toward shorter and longer wavelengths with data in the literature, along with inter- and extrapolations, in order to obtain a self-consistent ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5355689 Wed, 26 Oct 2011 05:00:00 +0100 5355689 Off-plane anastigmatic imaging in Offner spectrometers http://www.medworm.com/index.php?rid=5355688&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-11-2332 In this paper, the imaging performance of an Offner concentric imaging spectrometer is analyzed when the spectrometer entrance slit is disposed arbitrarily on the plane that is parallel to the grating grooves and contains the common center of curvature. Astigmatism-corrected designs are obtained ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5355688 Wed, 26 Oct 2011 05:00:00 +0100 5355688 Ultrasound-modulated optical tomography: recovery of amplitude of vibration in the insonified region from boundary measurement of light correlation http://www.medworm.com/index.php?rid=5331081&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-11-2322 We address a certain inverse problem in ultrasound-modulated optical tomography: the recovery of the amplitude of vibration of scatterers [p(r)] in the ultrasound focal volume in a diffusive object from boundary measurement of the modulation depth (M) of the amplitude autocorrelation of light ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5331081 Thu, 20 Oct 2011 05:00:00 +0100 5331081 Full-complex amplitude modulation with binary spatial light modulators http://www.medworm.com/index.php?rid=5331083&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-11-2310 Imperfections and nonrobust behavior of practical multilevel spatial light modulators (SLMs) degrade the performance of many proposed full-complex amplitude modulation schemes. We consider the use of more robust binary SLMs for this purpose. We propose a generic method, by which, out of K binary ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5331083 Wed, 19 Oct 2011 05:00:00 +0100 5331083 Fast computation of an optimal controller for large-scale adaptive optics http://www.medworm.com/index.php?rid=5331082&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-11-2298 The linear quadratic Gaussian regulator provides the minimum-variance control solution for a linear time-invariant system. For adaptive optics (AO) applications, under the hypothesis of a deformable mirror with instantaneous response, such a controller boils down to a minimum-variance phase ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5331082 Wed, 19 Oct 2011 05:00:00 +0100 5331082 Effective medium theory for random media composed of two-layered spheres http://www.medworm.com/index.php?rid=5321759&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-11-2292 We study the effective index of random media composed of two-layered spheres by using the energy-density coherent potential approximation method. As expected from the Ewald–Oseen extinction theorem, in the long-wavelength limit, the optical properties of a random medium composed of ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5321759 Sun, 16 Oct 2011 16:23:44 +0100 5321759 Highlight detection and removal from spectral image http://www.medworm.com/index.php?rid=5311174&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-11-2284 We present a constrained spectral unmixing method to remove highlight from a single spectral image. In the constrained spectral unmixing method, the constraints have been imposed so that all the fractions of diffuse and highlight reflection sum up to 1 and are positive. As a result, the spectra of ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5311174 Thu, 13 Oct 2011 05:00:00 +0100 5311174 Three-dimensional polarization states of monochromatic light fields http://www.medworm.com/index.php?rid=5311173&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-11-2279 The 3×1 generalized Jones vectors (GJVs) [E_xE_yE_z]^t (t indicates the transpose) that describe the linear, circular, and elliptical polarization states of an arbitrary three-dimensional (3-D) monochromatic light field are determined in terms of the geometrical parameters of the 3-D ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5311173 Thu, 13 Oct 2011 05:00:00 +0100 5311173 Fast convergence with spectral volume integral equation for crossed block-shaped gratings with improved material interface conditions http://www.medworm.com/index.php?rid=5311175&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-11-2269 For block-shaped dielectric gratings with two-dimensional periodicity, a spectral-domain volume integral equation is derived in which explicit Fourier factorization rules are employed. The Fourier factorization rules are derived from a projection-operator framework and enhance the numerical ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5311175 Wed, 12 Oct 2011 05:00:00 +0100 5311175 Solutions of large-scale electromagnetics problems involving dielectric objects with the parallel multilevel fast multipole algorithm http://www.medworm.com/index.php?rid=5293667&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-11-2261 Fast and accurate solutions of large-scale electromagnetics problems involving homogeneous dielectric objects are considered. Problems are formulated with the electric and magnetic current combined-field integral equation and discretized with the Rao–Wilton–Glisson functions. ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5293667 Fri, 07 Oct 2011 23:05:53 +0100 5293667 Orbital angular momentum of Laguerre–Gaussian beams beyond the paraxial approximation http://www.medworm.com/index.php?rid=5293666&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-11-2253 We derive a full field solution for Laguerre–Gaussian beams consistent with the Helmholtz equation using the angular spectrum method. Field components are presented as an order expansion in the ratio of the wavelength to the beam waist, f=λ/(2πw_0), which is typically small. The ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5293666 Fri, 07 Oct 2011 23:05:53 +0100 5293666 Methods for computing weighting tables based on local power expansion for tristimulus values computations http://www.medworm.com/index.php?rid=5293665&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-11-2243 In this paper, two types of weighting tables are derived by applying the local power expansion method proposed by Oleari [Color Res. Appl.25, 176 (2000)CREADU0361-231710.1002/(SICI)1520-6378(200006)25:33.0.CO;2-Z]. Both tables at two different levels consider the deconvolution ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5293665 Fri, 07 Oct 2011 23:05:53 +0100 5293665 Depth-minimized, large period half-wave corrugation for linear to radial and azimuthal polarization transformation by grating-mode phase management http://www.medworm.com/index.php?rid=5293668&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-11-2235 The transformation of the polarization distribution of a laser beam from linear to radial and azimuthal by means of a subwavelength binary corrugation etched in a high-index substrate faces fabrication difficulties and an inherent contradiction preventing the achievement of both conditions of 100% ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5293668 Fri, 07 Oct 2011 05:00:00 +0100 5293668 Generalization of color-difference formulas for any illuminant and any observer by assuming perfect color constancy in a color-vision model based on the OSA-UCS system http://www.medworm.com/index.php?rid=5293669&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-11-2226 The most widely used color-difference formulas are based on color-difference data obtained under D65 illumination or similar and for a 10° visual field; i.e., these formulas hold true for the CIE 1964 observer adapted to D65 illuminant. This work considers the psychometric color-vision model ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5293669 Thu, 06 Oct 2011 05:00:00 +0100 5293669 Performance enhancements to absorbance-modulation optical lithography. II. Plasmonic superlenses http://www.medworm.com/index.php?rid=5293671&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-11-2218 The ability to improve the transmission and intensity profiles in absorbance-modulation optical lithography (AMOL) [J. Opt. Soc. Am. A23, 2290 (2006)JOAOD60740-323210.1364/JOSAA.23.002290 and Phys. Rev. Lett.98, 043905 (2007)PRLTAO0031-900710.1103/PhysRevLett.98.043905] through the introduction of ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5293671 Wed, 05 Oct 2011 05:00:00 +0100 5293671 Performance enhancements to absorbance-modulation optical lithography. I. Plasmonic reflector layers http://www.medworm.com/index.php?rid=5293670&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-11-2209 The ability to improve the transmission and intensity profiles in absorbance-modulation optical lithography [J. Opt. Soc. Am. A23, 2290–2294 (2006)JOAOD60740-323210.1364/JOSAA.23.002290 and Phys. Rev. Lett.98, 043905 (2007)PRLTAO0031-900710.1103/PhysRevLett.98.043905] through the ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5293670 Wed, 05 Oct 2011 05:00:00 +0100 5293670 Numerical simulation of multiple scattering by random discrete particles illuminated by Gaussian beams http://www.medworm.com/index.php?rid=5269370&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-11-2200 In this paper, we present an efficient numerical method for the simulation of multiple scattering by random discrete particles illuminated by focused Gaussian beams with arbitrary incidence. Specifically, the Davis first-order approximation in combination with rotation Euler angles is used to ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5269370 Sat, 01 Oct 2011 00:37:34 +0100 5269370 Comparison of polarimetric techniques for the identification of biological and chemical materials using Mueller matrices, lateral waves, and surface waves http://www.medworm.com/index.php?rid=5246629&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-10-2139 We present here several options for the measurement of optical rotation, ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5246629 Fri, 23 Sep 2011 05:00:00 +0100 5246629 Cumulative Reconstructor: fast wavefront reconstruction algorithm for Extremely Large Telescopes http://www.medworm.com/index.php?rid=5246630&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-10-2132 The Cumulative Reconstructor (CuRe) is a new direct reconstructor for an optical wavefront from Shack–Hartmann wavefront sensor measurements. In this paper, the algorithm is adapted to realistic telescope geometries and the transition from modified Hudgin to Fried geometry is discussed. ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5246630 Thu, 22 Sep 2011 05:00:00 +0100 5246630 Bessel–Gauss beams as rigorous solutions of the Helmholtz equation http://www.medworm.com/index.php?rid=5233826&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-10-2100 The study of the nonparaxial propagation of optical beams has received considerable attention. In particular, the so-called complex-source/sink model can be used to describe strongly focused beams near the beam waist, but this method has not yet been applied to the Bessel–Gauss (BG) beam. In ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5233826 Tue, 20 Sep 2011 04:24:26 +0100 5233826 Approximate Fourier phase information in the phase retrieval problem: what it gives and how to use it http://www.medworm.com/index.php?rid=5233825&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-10-2124 This work evaluates the importance of approximate Fourier phase information in the phase retrieval problem. The main discovery is that a rough phase estimate (up to π/2?rad) allows development of very efficient algorithms whose reconstruction time is an order of magnitude faster than that of ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5233825 Tue, 20 Sep 2011 04:24:26 +0100 5233825 Generating inhomogeneously polarized higher-order laser beams by use of diffractive optical elements http://www.medworm.com/index.php?rid=5233824&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-10-2115 We propose an improved version of the earlier developed optical arrangement for generating inhomogeneously polarized laser light modes with the aid of a diffractive optical element (DOE) with carrier frequency. By eliminating lenses from the optical arrangement, we achieve the miniaturization, ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5233824 Tue, 20 Sep 2011 04:24:26 +0100 5233824 Quantitative determination of dynamical properties using coherent spatial frequency domain imaging http://www.medworm.com/index.php?rid=5233823&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-10-2108 Laser speckle imaging (LSI) is a fast, noninvasive method to obtain relative particle dynamics in highly light scattering media, such as biological tissue. To make quantitative measurements, we combine LSI with spatial frequency domain imaging, a technique where samples are illuminated with ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5233823 Tue, 20 Sep 2011 04:24:26 +0100 5233823 Compensation of shear waves in photoacoustic tomography with layered acoustic media http://www.medworm.com/index.php?rid=5233827&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-10-2091 An image reconstruction formula is presented for photoacoustic computed tomography that accounts for conversion between longitudinal and shear waves in a planar-layered acoustic medium. We assume the optical absorber that produces the photoacoustic wave field is embedded in a single fluid layer and ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5233827 Mon, 19 Sep 2011 05:00:00 +0100 5233827 Light scattering by optically soft large particles of arbitrary shape http://www.medworm.com/index.php?rid=5233829&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-10-2086 Light scattering by chaotically oriented optically soft large particles of arbitrary shape is considered within the framework of the Rayleigh–Gans approximation. It has been shown that outside the forward direction, the scattering pattern has the dependence of ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5233829 Fri, 16 Sep 2011 05:00:00 +0100 5233829 Vectorized polarization-sensitive model of non-line-of-sight multiple-scatter propagation http://www.medworm.com/index.php?rid=5233828&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-10-2082 The existing Monte-Carlo-based non-line-of-sight (NLOS) multiple-scatter propagation model is extended to include polarization and also vectorized to improve the simulation speed by about 500 times. This model is validated by the noncoplanar single-scatter model; the results show a perfect match. ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5233828 Fri, 16 Sep 2011 05:00:00 +0100 5233828 Pseudo-time particle filtering for diffuse optical tomography http://www.medworm.com/index.php?rid=5233830&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-10-2070 We recast the reconstruction problem of diffuse optical tomography (DOT) in a pseudo-dynamical framework and develop a method to recover the optical parameters using particle filters, i.e., stochastic filters based on Monte Carlo simulations. In particular, we have implemented two such filters, ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5233830 Tue, 13 Sep 2011 05:00:00 +0100 5233830 Distortion of terahertz signals due to imperfect synchronization with chirped probe pulses http://www.medworm.com/index.php?rid=5204458&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-10-2049 Terahertz (THz) signals measured by means of the spectral-encoding technique with different temporal discrepancies between probe pulses and THz signals are investigated. It is found that imperfect synchronization between the chirped probe and THz pulses induce a distortion and this distortion ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5204458 Sun, 11 Sep 2011 04:59:37 +0100 5204458 From CIE 2006 physiological model to improved age-dependent and average colorimetric observers http://www.medworm.com/index.php?rid=5204457&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-10-2033 In the context of color perception on modern wide-gamut displays with narrowband spectral primaries, we performed a theoretical analysis on various aspects of physiological observers proposed by CIE TC 1-36 (CIEPO06). We allowed certain physiological factors to vary, which was not considered in the ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5204457 Sun, 11 Sep 2011 04:59:37 +0100 5204457 Multiresolution subspace-based optimization method for inverse scattering problems http://www.medworm.com/index.php?rid=5204456&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-10-2057 This paper investigates an approach to inverse scattering problems based on the integration of the subspace-based optimization method (SOM) within a multifocusing scheme in the framework of the contrast source formulation. The scattering equations are solved by a nested three-step procedure ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5204456 Sun, 11 Sep 2011 04:59:37 +0100 5204456 Effects of primary spherical aberration, coma, astigmatism, and field curvature on the focusing of ultrashort pulses: Gaussian illumination and experiment http://www.medworm.com/index.php?rid=5204461&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-10-1990 We analyze the spatiotemporal intensity of Gaussian temporal envelope pulses with initial durations of 200?fs and a carrier wavelength of 810?nm at the paraxial focal plane of an achromatic doublet lens for a well-collimated incoming pulse beam by using the Seidel aberration theory for thin lenses ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5204461 Fri, 09 Sep 2011 05:00:00 +0100 5204461 Precision and accuracy of the analog mean-delay method for high-speed fluorescence lifetime measurement http://www.medworm.com/index.php?rid=5204460&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-10-2026 The analog mean-delay (AMD) method is a new alternative method to measure the lifetime of a fluorescence molecule. Because of its powerful advantages of accurate lifetime determination, good photon economy, and a high photon detection rate, the AMD method is considered to be very suitable for ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5204460 Fri, 09 Sep 2011 05:00:00 +0100 5204460 Trajectories in parallel optics http://www.medworm.com/index.php?rid=5204459&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-10-2014 In our previous work we showed the ability to improve the optical system’s matrix condition by optical design, thereby improving its robustness to noise. It was shown that by using singular value decomposition, a target point-spread function (PSF) matrix can be defined for an auxiliary ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5204459 Fri, 09 Sep 2011 05:00:00 +0100 5204459 Modal method based on subsectional Gegenbauer polynomial expansion for lamellar gratings http://www.medworm.com/index.php?rid=5204463&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-10-2006 A first approach of a modal method by Gegenbauer polynomial expansion (MMGE1) is presented for a plane wave diffraction by a lamellar grating. Modal methods are among the most popular methods that are used to solve the problem of lamellar gratings. They consist in describing the electromagnetic ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5204463 Thu, 08 Sep 2011 05:00:00 +0100 5204463 Second-order derivatives of a ray with respect to the variables of its source ray in optical systems containing spherical boundary surfaces http://www.medworm.com/index.php?rid=5204462&cid=s_36564_75_f&fid=36564&url=http%3A%2F%2Fwww.opticsinfobase.org%2Fabstract.cfm%3FURI%3Djosaa-28-10-1995 The second-order derivative matrix of a scalar function with respect to a variable vector is called a Hessian matrix, which is a square matrix. Our research group previously presented a method for determination of the first-order derivatives (i.e., the Jacobian matrix) of a skew ray with respect to ... (Source: Journal of the Optical Society of America A) Journal of the Optical Society of America A journals http://www.medworm.com/rss/comments.php?id=5204462 Thu, 08 Sep 2011 05:00:00 +0100 5204462