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132 records returned

Image fusion methodology for efficient interpretation of multiband images in 3D high-resolution ultrasonic transmission tomographyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
With the critical innovations of using submillimeter transducers and multiband analysis of the first arrival pulse, a high-resolution ultrasonic transmission tomography (HUTT) system has been built and tested to produce multiband images of biological organs at submillimeter resolution. Since the resulting multiband images consist of frequency-dependent attenuation coefficients (relative to water reference) of transmitted ultrasound pulses, their contrast and sharpness depend on the specific frequency band(s) used for image formation. Even though this multiband representation provides a powerful tool for soft-tissue differe...
Source: International Journal of Imaging Systems and Technology - November 7, 2009 Category: Radiology Authors: Jeong-Won Jeong, Dae C. Shin, Vasilis Z. Marmarelis Tags: Research Articles Source Type: journals

An image compression method based on multiple models for the probabilities of patternsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
This article proposes an image compression method based on multiple models for the probabilities of patterns (MMPP method) to encode a gray-level image f. First, the MMPP method employs a median edge detector (MED) to reduce the entropy of f. The intensities of two adjacent pixels in an image are usually close to each other. A base switching transformation (BST) is then used to lessen the spatial redundancy of f. Finally, the arithmetic encoding method is applied to further encode the data generated after the processing of MED and BST. To reduce the memory space required to hold f, the MMPP method classifies the data and t...
Source: International Journal of Imaging Systems and Technology - November 6, 2009 Category: Radiology Authors: Yung-Kuan Chan, Ching-Lin Wang Tags: Research Articles Source Type: journals

Complexity-reduced and contrast-enhanced halftoning with hybrid modelEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
A high-efficiency and contrast-enhanced halftoning approach is presented in this article. The contrast of digital image depends highly on the nature of the ambient lighting and the quality of the lens. The required processing time skyrockets when a high printed work of high resolution and quality is needed. In this article, we use the benefits of high-speed ordered dithering and high-quality error diffusion to simultaneously solve the problems described earlier. Experimental results demonstrate that this technique is able to enlarge the dynamic range of the histogram and achieve improvement in execution efficiency of 15-47...
Source: International Journal of Imaging Systems and Technology - November 6, 2009 Category: Radiology Authors: Jing-Ming Guo, Chih-Yu Lin Tags: Research Articles Source Type: journals

Cross-band fusion by energy weight as solution to illumination and arch restrictions in palm-print recognitionEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
This article presents palm-print recognition based on cross-band fusion by energy weight and comprehensively takes into account the noisy properties of various sub-bands in single wavelet level and decomposition coefficient of the adjacent sub-band, thus the method of energy weight based on palm-print image is employed. Then two-dimensional principal component analysis (2DPCA) is employed for dimension reduction and decorrelated. Finally, a nearest neighbor classifier is used for palm-print recognition. Experimental results on Hong Kong PolyU palm-print database show that correct recognition rate can reach 100% by the meth...
Source: International Journal of Imaging Systems and Technology - November 6, 2009 Category: Radiology Authors: Xiao-Hua Chen, Chun-Zhi Li Tags: Research Articles Source Type: journals

Intra mode selection in downsizing video transcoder based on H.264Email this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
An intra mode selection scheme is proposed in this work, which supports both downsizing transcoding and re-quantization transcoding simultaneously. In the proposal, a total number of nonzero coefficients in precoded frame is used as criterion and a thresholding method is applied to select intra macroblock mode in re-encoder. To calculate this threshold, which is related to re-quantization parameter (denoted as Qr), we propose a Th_I-Qr model which includes direct method and percentage I16MB method. In the former, an exponent model is proposed to describe relationship between the threshold and the Qr; while in the latter, t...
Source: International Journal of Imaging Systems and Technology - November 6, 2009 Category: Radiology Authors: Zhao-Guang Liu, Yu Wang Tags: Research Articles Source Type: journals

Color-edge detection based on discrimination of noticeable color contrastsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Color-edge detection is an important research task in the field of image processing. Efficient and accurate edge detection will lead to higher performance of subsequent image processing techniques, including image segmentation, object-based image coding, and image retrieval. To improve the performance of color-edge detection while considering that human eyes are ultimate receiver of color images, the perceptually insignificant edges should avoid being over-detected. In this article, a color-edge detection scheme based on the perceptual color contrast is proposed. The perceptual color contrast is defined as the visible colo...
Source: International Journal of Imaging Systems and Technology - November 6, 2009 Category: Radiology Authors: Kuo-Cheng Liu Tags: Research Articles Source Type: journals

A study on restoration of iris images with motion-and-optical blur on mobile iris recognition devicesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
This article presents three contributions over previous research. (1) A new focus assessment method is proposed to measure accurate focus scores regardless of motion blurring. (2) Previous research restored coexisting motion-and-optical blurred images in terms of visibility, but in this article, we restored them in terms of recognition. (3) We used a modified CLS (Constrained Least Square) filter to prevent the zero-crossing of the PSF (Point Spread Function) of motion blurring with a uniform shape. So, the iris recognition accuracy was better than when using a conventional CLS filter. Experimental results showed that the ...
Source: International Journal of Imaging Systems and Technology - November 6, 2009 Category: Radiology Authors: Byung Jun Kang, Kang Ryoung Park Tags: Research Articles Source Type: journals

Application of highlight removal and multivariate image analysis to color measurement of flotation bubble imagesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Machine vision based analysis provides a novel technology for froth flotation monitoring. Froth images collected are characterized by fully occupied bubbles with different size and shape under various illuminations. Convex bubbles lead to the formation of white spots that seriously affect froth color measurement. In this article, specular highlights are detected and preprocessed so as to estimate underlying color of white spots region. Because of the fact that color information is believed to be related to flotation performance, therefore, after the application of highlight inpainting, multivariate image analysis is propos...
Source: International Journal of Imaging Systems and Technology - November 6, 2009 Category: Radiology Authors: Chunhua Yang, Canhui Xu, Weihua Gui, Kaijun Zhou Tags: Research Articles Source Type: journals

An adaptive scheme for compressed video steganography using temporal and spatial features of the video signalEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
This article proposes an adaptive steganographic algorithm that embeds secret data in a compressed video stream using temporal and spatial features of the video signal and human visual system characteristics. Qualified-DCT coefficients of I-VOP and motion vectors of P-VOP and B-VOP are used for spatial and temporal features of the video, respectively. Embedded-data are extracted without using the original video and there is no need for full decompression. Experimental results demonstrate that the proposed algorithm has high imperceptibility and capacity. Furthermore, the bit rate remains approximately constant. © 2009 Wil...
Source: International Journal of Imaging Systems and Technology - November 6, 2009 Category: Radiology Authors: Jafar Mansouri, Morteza Khademi Tags: Research Articles Source Type: journals

Image reconstruction for a partially immersed imperfectly conducting cylinder by genetic algorithmEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
This article presents a computational approach to the imaging of a partially immersed imperfectly conducting cylinder. An imperfectly conducting cylinder of unknown shape and conductivity scatters the incident transverse magnetic (TM) wave in free space while the scattered field is recorded outside. Based on the boundary condition and the measured scattered field, a set of nonlinear integral equations, and the inverse scattering problem are reformulated into an optimization problem. We use genetic algorithm (GA) to reconstruct the shape and the conductivity of a partially immersed imperfectly conducting cylinder. The genet...
Source: International Journal of Imaging Systems and Technology - November 6, 2009 Category: Radiology Authors: Wei Chien, Chi-Hsien Sun, Chien-Ching Chiu Tags: Research Articles Source Type: journals

Computer-aided diagnosis system for the detection of bronchiectasis in chest computed tomography imagesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
A computer-aided diagnosis (CAD) system has been developed for the detection of bronchiectasis from computed tomography (CT) images of chest. A set of CT images of the chest with known diagnosis were collected and these images were first denoised using Wiener filter. The lung tissue was then segmented using optimal thresholding. The Pathology Bearing Regions (PBRs) were then extracted by applying pixel-based segmentation. For each PBR, a gray level co-occurrence matrix (GLCM) was constructed. From the GLCM texture features were extracted and feature vectors were constructed. A probabilistic neural network (PNN) was constru...
Source: International Journal of Imaging Systems and Technology - November 6, 2009 Category: Radiology Authors: D. Shiloah Elizabeth, A. Kannan, H. Khanna Nehemiah Tags: Research Articles Source Type: journals

Reduced model of discrete-time dynamic image segmentation system and its bifurcation analysisEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We have developed a discrete-time dynamic image segmentation system consisting of chaotic neurons and a global inhibitor. Our system receives an image with isolated regions and can output segmented images in time series based on oscillatory responses of chaotic neurons. In this article, we derive a reduced model to find intrinsic properties of the system of dynamic image segmentation. Using numerical method for analyzing dynamical systems, we investigated bifurcation phenomena of a fixed point observed in the reduced model. As the results, in a model of two coupled chaotic neurons, we found that a set of Neimark-Sacker bif...
Source: International Journal of Imaging Systems and Technology - November 6, 2009 Category: Radiology Authors: Ken'ichi Fujimoto, Mio Musashi, Tetsuya Yoshinaga Tags: Research Articles Source Type: journals

A framework of view-dependent planar scene active camouflageEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Active camouflage is a technique for occluding objects disappear from the observer. Current implementations make assumptions on the viewpoints of both the observer and the camouflaged target. In this work, we present a framework of view-dependent planar scene camouflage. The cameras representing the observer and the occluding object are placed in general positions. The images captured by the object camera are transformed to the observer viewpoint to generate globally consistent visual data for transparent camouflage. Experimental results are presented for real scene images. © 2009 Wiley Periodicals, Inc. Int J Imaging Sys...
Source: International Journal of Imaging Systems and Technology - August 27, 2009 Category: Radiology Authors: Huei-Yung Lin, Wen-Nung Lie, Min-Liang Wang Source Type: journals

Attenuation map estimation with SPECT emission data onlyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Quantitative single-photon emission computed tomography can be well achieved if photon attenuation is taken into account in the reconstruction process. Using a transmission scan is a common approach. A dramatic simplification could be made if the attenuation map could be obtained from the emission data. In this article, we propose a new method to estimate the attenuation map using the data consistency conditions of the attenuated Radon transform. It is based on deriving boundaries of the constant regions of the true attenuation map using an iterative algorithm. This new method is tested by Monte Carlo simulations with the ...
Source: International Journal of Imaging Systems and Technology - August 4, 2009 Category: Radiology Authors: Yan Yan, Gengsheng Lawrence Zeng Source Type: journals

Detection and segmentation of cervical cell cytoplast and nucleusEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
This article aims to develop a method for the detection and segmentation of a cytoplast and nucleus from a cervix smear image. First, the technique of equalization method with Gaussian filter is adopted to eliminate noise in the image. Second, a new edge enhancement technique is proposed to work out the coarseness of each pixel, which is later used as a determining characteristic of reinforced object images. A two-group object enhancement technique is then used to reinforce this object according to rough pixels. Third, the proposed detector enhances the gradients of the edges of the cytoplast and nucleus while suppressing ...
Source: International Journal of Imaging Systems and Technology - August 4, 2009 Category: Radiology Authors: Chuen-Horng Lin, Yung-Kuan Chan, Chun-Chieh Chen Source Type: journals

Contemporary technologies for 3D digitization of Maori and Pacific Island artifactsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The objective of this article is to investigate contemporary technologies for creating accurate 3D digital models of artifacts from the Maori and Pacific heritage and to establish a generic digitization methodology so that the 3D models can be archived and exhibited both over the internet and within museum displays. This process involves procedures for selecting artifacts that are suitable for laser scanning and then setting up the artifact for scanning. This is followed by the actual scanning and postprocessing stages. To achieve this, the Polhemus FastSCAN laser scanner has been used to collect raw point cloud surface da...
Source: International Journal of Imaging Systems and Technology - August 4, 2009 Category: Radiology Authors: Nanda K. Surendran, Xun W. Xu, Oliver Stead, Heather Silyn-Roberts Source Type: journals

Plant leaf identification using Gabor waveletsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
This article presents a novel method of plant classification using Gabor wavelet filters to extract texture filters in a foliar surface. The aim of this promising method is to add to the results obtained by other leaf attributes (such as shape, contour, color, among others), increasing, therefore, the percentage of classification of plant species. To corroborate the efficiency of the technique, an experiment using 20 species from Brazilian flora was done and discussed. The results are also compared with texture Fourier descriptors and cooccurrence matrices. © 2009 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 19, 23...
Source: International Journal of Imaging Systems and Technology - August 4, 2009 Category: Radiology Authors: Dalcimar Casanova, Jarbas Joaci de Mesquita Sá Junior, Odemir Martinez Bruno Source Type: journals

Secure video distribution scheme based on partial encryptionEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
In TV program distribution, the receiver's identification information is embedded into video data in order to trace illegal distributors, and video data are encrypted in order to protect the confidentiality against unauthorized users. In traditional method, the TV program is firstly fingerprinted, then encrypted, and finally transmitted. For N receivers, N times of encryption, and N times of fingerprinting operations are required, which makes the sender of high loading. In another method, the media content is decrypted and fingerprinted simultaneously by the joint fingerprint embedding and decryption, which is difficult to...
Source: International Journal of Imaging Systems and Technology - August 4, 2009 Category: Radiology Authors: Shiguo Lian Source Type: journals

Compensating for nonstationary blurring by further blurring and deconvolutionEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
This article presents a new idea of using a noniterative method to compensate for the spatially variant PSF. This method first further blurs the image with a nonstationary kernel so that the resultant image has a stationary PSF, then deblurs the resultant image using an efficient decovolution technique. The proposed method is illustrated and implemented by single photon emission computed tomography applications. © 2009 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 19, 221-226, 2009 (Source: International Journal of Imaging Systems and Technology)
Source: International Journal of Imaging Systems and Technology - August 4, 2009 Category: Radiology Authors: Gengsheng L. Zeng Source Type: journals

Visual data association for real-time video tracking using genetic and estimation of distribution algorithmsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
In this article, an efficient and novel approach for video data association is developed. This new method is formulated as a search across the hypotheses space defined by the possible association among tracks and detections, carried out for each frame of a video sequence. The full data association problem in visual tracking is formulated as a combinatorial hypotheses search with a heuristic evaluation function taking into account structural and specific information such as distance, shape, color, etc. To guarantee real-time performance, a time limit is set for the search process explore alternative solutions. This time lim...
Source: International Journal of Imaging Systems and Technology - August 4, 2009 Category: Radiology Authors: Miguel A. Patricio, Jesús García, Antonio Berlanga, José M. Molina Source Type: journals

Satellite image segmentation using hybrid variable genetic algorithmEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Image segmentation is an important task in image processing and analysis. Many segmentation methods have been used to segment satellite images. The success of each method depends on the characteristics of the acquired image such as resolution limitations and on the percentage of imperfections in the process of image acquisition due to noise. Many of these methods require a priori knowledge which is difficult to obtain. Some of them are parametric statistical methods that use many parameters which are dependent on image property. In this article, a new unsupervised nonparametric method is developed to segment satellite imag...
Source: International Journal of Imaging Systems and Technology - August 4, 2009 Category: Radiology Authors: Mohamad M. Awad, Kacem Chehdi Source Type: journals

Texture-based parametric active contour for target detection and trackingEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
This article presents a new tracking method based on parametric active contour models. In the proposed method, a new pressure energy called "texture pressure energy" is added to the energy function of the parametric active contour model to detect and track a texture target object in a texture background. In this scheme, the texture features of the contour are calculated by a moment-based method. Then, by comparing these features with texture features of the target object, the contour curve is expanded or contracted to be adapted to the object boundaries. Experimental results show that the proposed method is more efficient ...
Source: International Journal of Imaging Systems and Technology - August 4, 2009 Category: Radiology Authors: Ali Reza Vard, Payman Moallem, Ahmad Reza Naghsh Nilchi Source Type: journals

Finger vein recognition using minutia-based alignment and local binary pattern-based feature extractionEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
This article proposes a new finger vein recognition method using minutia-based alignment and local binary pattern (LBP)-based feature extraction. Our study makes three novelties compared to previous works. First, we use minutia points such as bifurcation and ending points of the finger vein region for image alignment. Second, instead of using the whole finger vein region, we use several extracted minutia points and a simple affine transform for alignment, which can be performed at fast computational speed. Third, after aligning the finger vein image based on minutia points, we extract a unique finger vein code using a LBP,...
Source: International Journal of Imaging Systems and Technology - August 4, 2009 Category: Radiology Authors: Eui Chul Lee, Hyeon Chang Lee, Kang Ryoung Park Source Type: journals

EM algorithm-based adaptive custom thresholding for image denoising in wavelet domainEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
In this article, a novel denoising technique based on custom thresholding operating in the wavelet transform domain is proposed. The denoising process is spatially adaptive and also sub-band adaptive. To render the denoising algorithm space adaptive, a Vector Quantization (VQ)-based algorithm is used. The design of the VQ is based on Expectation Maximization (EM) algorithm. The results of the algorithm is demonstrated on SAR images corrupted by speckle noise. Experimental results show that Custom thresholding function outperforms the traditional soft, hard, and Bayes threshoding functions, improving the denoised results si...
Source: International Journal of Imaging Systems and Technology - August 4, 2009 Category: Radiology Authors: S. Selvakumar Raja, Mala John Source Type: journals

Guest editorial: Contemporary challenges in combinatorial image analysisEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
No abstract. (Source: International Journal of Imaging Systems and Technology)
Source: International Journal of Imaging Systems and Technology - May 15, 2009 Category: Radiology Authors: Reneta P. Barneva, Valentin E. Brimkov Source Type: journals

Algorithms for connected component labeling based on quadtreesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
An algorithm of linear time complexity is presented to label connected components of a binary image by a quadtree. For a given node, the search for all adjacent nodes is carried out in O(1) (i.e., constant time complexity for the worst case) using our formerly presented algorithm in (Aizawa et al., 3rd International Symposium on Communications, Control, and Signal Processing,, 505-510), whereas it explores all possible adjacencies for each node in a usual way. Then during the process of tree formulation in the search, all equivalent relations of labels are stored as lists. Time complexity of the algorithm is O(B+W) for the...
Source: International Journal of Imaging Systems and Technology - May 13, 2009 Category: Radiology Authors: Kunio Aizawa, Shojiro Tanaka, Koyo Motomura, Ryosuke Kadowaki Source Type: journals

Neighborhood sequences in the diamond grid: Algorithms with two and three neighborsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
In the digital image processing, digital distances are useful; distances based on neighborhood sequences are widely used. In this article, the diamond grid is considered, that is, the three-dimensional grid of carbon atoms in the diamond crystal. An algorithm to compute a shortest path defined by a neighborhood sequence between any two points in the diamond grid is presented. A formula to compute the distance based on neighborhood sequences with two neighborhood relations is given. The metric and nonmetric properties of some distances based on neighborhood sequences are also discussed. Finally, the constrained distance tra...
Source: International Journal of Imaging Systems and Technology - May 13, 2009 Category: Radiology Authors: Benedek Nagy, Robin Strand Source Type: journals

Recognizability of iso-picture languages by Wang systemsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
In the context of a syntactic approach to pattern recognition, there have been several studies in the last few decades ontheoretical models for generating or recognizing two-dimensional objects, pictures, and picture languages. Motivated by these studies, we have introduced a new notion of recognizability for a class of picture languages called iso-picture languages through iso-triangular tiling systems (ITS) and studied the properties of these languages [Kalyani et al.,]. In [Kalyani et al.,], we introduced iso-triangular domino systems (IDS) to recognize iso-picture languages, and proved the equivalence of ITS and IDS. I...
Source: International Journal of Imaging Systems and Technology - May 13, 2009 Category: Radiology Authors: T. Kalyani, V. R. Dare, D. G. Thomas Source Type: journals

Computing surfaces via pq-permutationsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
In algebraic topology, compact two-dimensional manifolds are usually dealt through a well-defined class of words denoting polygonal presentations. In this article, we show how to eliminate the useless bureaucracy intrinsic to word-based presentations by considering very simple combinatorial structures called pq-permutations. Thanks to their specific effectiveness, pq-permutations induce a rewriting system P able to compute, in a very easy and intuitive way, the quotient surface associated with any given polygonal presentation. The system P is shown to enjoy both the fundamental computational properties of strong normalizat...
Source: International Journal of Imaging Systems and Technology - May 13, 2009 Category: Radiology Authors: Gabriele Pulcini Source Type: journals

Supervised pattern classification based on optimum-path forestEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We present a supervised classification method which represents each class by one or more optimum-path trees rooted at some key samples, called prototypes. The training samples are nodes of a complete graph, whose arcs are weighted by the distances between the feature vectors of their nodes. Prototypes are identified in all classes and the minimization of a connectivity function by dynamic programming assigns to each training sample a minimum-cost path from its most strongly connected prototype. This competition among prototypes partitions the graph into an optimum-path forest rooted at them. The class of the samples in an ...
Source: International Journal of Imaging Systems and Technology - May 13, 2009 Category: Radiology Authors: J. P. Papa, A. X. Falcão, C. T. N. Suzuki Source Type: journals

A theoretical solution to MAP-EM partial volume segmentation of medical imagesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
This article presents, based on the assumption that PV effect could be fully described by a tissue mixture model, a theoretical solution to the MAP-EM segmentation algorithm, as opposed to our previous approximation which simplified the posteriori cost function as a quadratic term. It was found out that the theoretically-derived solution existed in a set of high-order nonlinear equations. Despite of the induced computational complexity when seeking for optimum numerical solutions to nonlinear equations, potential gains in robustness, consistency and quantitative precision were noticed. Results from both synthetic digital p...
Source: International Journal of Imaging Systems and Technology - May 13, 2009 Category: Radiology Authors: Su Wang, Hongyu Lu, Zhengrong Liang Source Type: journals

Producing stylized videos using the AnimVideo rendering toolEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
This article describes the AnimVideo rendering tool that was developed for stylizing videos with temporal coherence. The temporal coherence is achieved by first fully segmenting the input video with a fast fuzzy segmentation algorithm that uses hybrid color spaces and motion information. The result of the segmentation algorithm is used to constrain the result of an optical flow algorithm, given as dense optical flow maps that are then used to correctly move, remove, or add structural drawing elements. The combination of these two methods is referred to as constrained optical flow, and we also provide the option of initiali...
Source: International Journal of Imaging Systems and Technology - May 13, 2009 Category: Radiology Authors: Rafael B. Gomes, Lucas M. Oliveira, Laurindo S. Britto-Neto, Tiago S. Santos, Gilbran S. Andrade, Bruno M. Carvalho, Luiz M. G. Gonçalves Source Type: journals

Temporal motion recognition and segmentation approachEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Separating or segmenting complex activities into basic action primitives is important for event recognition and other applications. In this article, simple approaches are presented for appearance-based action recognition, as well as motion segmentation into its action primitives. Optical flow is computed and split into four channels based on four directions, namely, up, down, left, and right. Based on these four motion vectors, motion history and the corresponding energy templates are generated. These are used for action recognition. Moreover, to segment sequential activity, the temporal motion segmentation (TMS) method is...
Source: International Journal of Imaging Systems and Technology - May 13, 2009 Category: Radiology Authors: Md. Atiqur Rahman Ahad, J. K. Tan, H. S. Kim, S. Ishikawa Source Type: journals

Motion segmentation and activity representation in crowdsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Video surveillance of large facilities, such as airports, rail stations, and casinos, is developing rapidly. Cameras installed at such locations often overlook large crowds, which makes problems such as activity and scene understanding very challenging. Traditional activity understanding techniques, which rely on input from lower level processing units dealing with background subtraction, human detection, and tracking, are unable to cope with frequent occlusions in such scenes. We propose a novel spatiotemporal segmentation and activity recognition framework that bypasses these commonly used low-level modules. We model eac...
Source: International Journal of Imaging Systems and Technology - May 13, 2009 Category: Radiology Authors: Yunqian Ma, Petr Cisar, Aniruddha Kembhavi Source Type: journals

Languages for constrained binary segmentation based on maximum a posteriori probability labelingEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We use a MRF with asymmetric pairwise compatibility constraints between direct pixel neighbors to solve a constrained binary image segmentation task. The model is constraining shape and alignment of individual contiguous binary segments by introducing auxiliary labels and their pairwise interactions. Such representation is not necessarily unique. We study several ad-hoc labeling models for binary images consisting of nonoverlapping rectangular contiguous regions. Nesting and equivalence of these models are studied. We observed a noticeable increase in performance even in cases when the differences between the models were s...
Source: International Journal of Imaging Systems and Technology - May 13, 2009 Category: Radiology Authors: Jan [Ccaron]ech, Radim [Scaron]ára Source Type: journals

Data clustering as an optimum-path forest problem with applications in image analysisEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We propose an approach for data clustering based on optimum-path forest. The samples are taken as nodes of a graph, whose arcs are defined by an adjacency relation. The nodes are weighted by their probability density values (pdf) and a connectivity function is maximized, such that each maximum of the pdf becomes root of an optimum-path tree (cluster), composed by samples "more strongly connected" to that maximum than to any other root. We discuss the advantages over other pdf-based approaches and present extensions to large datasets with results for interactive image segmentation and for fast, accurate, and automatic brain...
Source: International Journal of Imaging Systems and Technology - May 13, 2009 Category: Radiology Authors: Leonardo Marques Rocha, Fábio A. M. Cappabianco, Alexandre Xavier Falcão Source Type: journals

Combining ubiquitous direction-sensitive digitizing with a multimedia electronic dictionary for enhanced understandingEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We propose and discuss a novel method for enhancing books and other printed materials with layers of digital data blended with their page content. In document digitizing a patented Cluster Pattern Interface (CLUSPI®) is used for providing orientation and position feedback that establishes connections with an electronic multimedia dictionary employing pictures, multilingual word explanations, and pronunciation samples. The work is mainly oriented to young children and aims to enhance their reading comprehension and to develop their language learning skills. © 2009 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 19, 39...
Source: International Journal of Imaging Systems and Technology - May 13, 2009 Category: Radiology Authors: Reneta P. Barneva, Valentin E. Brimkov, Kamen D. Kanev Source Type: journals

Resolution trade-off analysis for aperture size and signaling bandwidth of diffraction tomography based on spatial-frequency spectral coverageEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The objective of this article is to present the trade-off analysis of resolving capability of diffraction tomography between aperture size and illumination signal bandwidth based on the span of spatial spectral coverage. The analysis is conducted on both the transmission and reflection modes, and can be generalized into various data acquisition configurations. In addition, the analysis provides an important link to other tomographic imaging modalities such as the classical X-ray tomography and synthetic aperture radar systems. © 2009 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 19, 1-4, 2009 (Source: International ...
Source: International Journal of Imaging Systems and Technology - February 10, 2009 Category: Radiology Authors: Hua Lee Source Type: journals

Iterative algorithm for optimal fiducials under weak perspective projectionEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
In previous work, we designed space fiducials with the aim of making camera pose determination as noise-insensitive as possible. These fiducials turned out to be sets of points that formed concentric regular polyhedra. Here, we apply an idea of Dementhon and Davis and test and analyze an iterative linear algorithm in conjunction with our optimal fiducials to increase the accuracy of the computed camera pose. We also analyze under what circumstances this iterative algorithm is guaranteed to converge to the correct solution. Comprehensive computer simulations illustrate the behavior of the algorithm and the degree of improve...
Source: International Journal of Imaging Systems and Technology - February 9, 2009 Category: Radiology Authors: Alfred M. Bruckstein, Robert J. Holt, Arun N. Netravali Source Type: journals

Color reduction for complex document imagesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
A new technique for color reduction of complex document images is presented in this article. It reduces significantly the number of colors of the document image (less than 15 colors in most of the cases) so as to have solid characters and uniform local backgrounds. Therefore, this technique can be used as a preprocessing step by text information extraction applications. Specifically, using the edge map of the document image, a representative set of samples is chosen that constructs a 3D color histogram. Based on these samples in the 3D color space, a relatively large number of colors (usually no more than 100 colors) are o...
Source: International Journal of Imaging Systems and Technology - February 9, 2009 Category: Radiology Authors: Nikos Nikolaou, Nikos Papamarkos Source Type: journals

Conoscopic holograms analysis using variations of the Hough transformEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The analysis of holograms obtained using a Conoscopic setup is a very complex subject, given their nature. Holograms contain the 3D depth information about an object whose surface is to be measured and later reconstructed. The recovery of depth information has so far been carried out using mathematical transforms in combination with linear regression techniques. Here the Hough transform, a useful Computer Vision technique for detecting features in images is adapted to the analysis of holograms in order to establish distance relationships for a given object. The captured images of holograms are pre-processed and subsequentl...
Source: International Journal of Imaging Systems and Technology - February 9, 2009 Category: Radiology Authors: Julius Butime, Luis Galo Corzo, Luis Fontan, Íñigo Gutiérrez García, Ainhoa Galarza, Iñaki Sancho Source Type: journals

Control of dermatology image integrity using reversible watermarkingEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We describe, after that, our proposed reversible watermarking method used for integrity verification, we also evaluate image visual quality after watermark embedding and the effectiveness of locating tampered regions. © 2009 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 19, 5-9, 2009 (Source: International Journal of Imaging Systems and Technology)
Source: International Journal of Imaging Systems and Technology - February 9, 2009 Category: Radiology Authors: Imen Fourati Kallel, Mohamed Salim Bouhlel, Jean-Christophe Lapayre, Eric Garcia Source Type: journals

An improvement in the moment-preserving thresholding methodEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Thresholding is frequently used for image segmentation. One of the most popular approach to thresholding is the moment-preserving thresholding method proposed by Tsai in 1985. However, it does not work well when the peaks of a histogram have a great size variation. Hence, in this study we propose a simple and effective improvement in Tsai's method such that suitable thresholds can be found even when the histogram has peaks with a great size variation. Experimental results show the effectiveness of the proposed improvement. © 2008 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 18, 365-370, 2008 (Source: International ...
Source: International Journal of Imaging Systems and Technology - December 5, 2008 Category: Radiology Authors: I-Ping Chen, Ming-Yi Lai, Ling-Ling Wang Source Type: journals

Transform-domain penalized-likelihood filtering of tomographic dataEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
We present motivation for performing the filtering step of the widely used filtered back-projection algorithm in a non-Radon domain. For square-error optimal penalized-likelihood regularization, filtering in a domain for which the true projection data is sparse in the angle dimension yields coefficients that are more faithful to the ideal filtered data than directly filtering the observed Radon-domain data. In contrast to traditional regularization techniques that filter each projection independently, the proposed filtering technique delivers improved reconstructions by exploiting the correlation of the data in the angle d...
Source: International Journal of Imaging Systems and Technology - December 5, 2008 Category: Radiology Authors: Ian C. Atkinson, Farzad Kamalabadi Source Type: journals

Artifactual time-course correlations in echo-planar fMRI with implications for studies of brain functionEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Brain function is widely investigated with functional magnetic resonance imaging (fMRI) in humans and animals. In fMRI, the time courses of voxels typically reflect the local blood-oxygen level, which is taken as an indicator of neuronal activity. Voxel time-course correlations are often explicitly modeled and interpreted in terms of neuronal interactions. They also affect standard analyses that do not explicitly target neuronal interactions. As a consequence, time-course correlations between voxels influence conclusions about cognitive and physiological brain processes in many studies. However, voxel correlations are know...
Source: International Journal of Imaging Systems and Technology - December 5, 2008 Category: Radiology Authors: Nikolaus Kriegeskorte, Jerzy Bodurka, Peter Bandettini Source Type: journals

Parallel fuzzy segmentation of multiple objectsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The usefulness of fuzzy segmentation algorithms based on fuzzy connectedness principles has been established in numerous publications. New technologies are capable of producing larger-and-larger datasets and this causes the sequential implementations of fuzzy segmentation algorithms to be time-consuming. We have adapted a sequential fuzzy segmentation algorithm to multiprocessor machines. We demonstrate the efficacy of such a distributed fuzzy segmentation algorithm by testing it with large datasets (of the order of 50 million points/voxels/items): a speed-up factor of [sim]5 over the sequential implementation seems to be ...
Source: International Journal of Imaging Systems and Technology - December 5, 2008 Category: Radiology Authors: Edgar Garduño, Gabor T. Herman Source Type: journals

Co-registration of in vivo human MRI brain images to postmortem histological microscopic imagesEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Certain features such as small vascular lesions seen in human MRI (Magnetic Resonance Imaging) are detected reliably only in postmortem histological samples by microscopic imaging. Co-registration of these microscopically detected features to their corresponding locations in the in vivo images would be of great benefit to understanding the MRI signatures of specific diseases. Using nonlinear Polynomial transformation, we report a method to co-register in vivo MRIs to microscopic images of histological samples drawn off the postmortem brain. The approach utilizes digital photographs of postmortem slices as an intermediate r...
Source: International Journal of Imaging Systems and Technology - December 5, 2008 Category: Radiology Authors: Manbir Singh, Amrita Rajagopalan, Tae-Seong Kim, Darryl Hwang, Helena Chui, Xiao-Ling Zhang, Ae-Young Lee, Chris Zarow Source Type: journals

Assessing spatial probabilistic distributional differences in the common space between schizophrenics and normal controls based on a novel automated probabilistic pattern analysis methodEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
Because of the complex nature of the human brain, a full understanding of its various group specific variation factors such as volume, shape, and location related to age, gender, ethnic, and disease might be provided in both structural and functional neuroimaging studies. To serve this purpose, a novel approach for characterizing the group variability information using group specific labeled probabilistic maps was introduced in this article. An automatic labeling technique was applied to encode group specific probabilistic information for each region of interests (ROIs) covering the overall cortical region and a probabilis...
Source: International Journal of Imaging Systems and Technology - December 5, 2008 Category: Radiology Authors: Bang-Bon Koo, Jong-Min Lee, June Sic Kim, Jun Sung Park, Jun Soo Kwon, Sun I. Kim Source Type: journals

Spectral weighting for distributed backward propagation image reconstruction in diffraction tomographyEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The objective of this work is to provide the formulation of the spatial-frequency weighting of distributed filtered backward propagation in multiple-projection diffraction tomography. This formulation provides the precise frequency-weighting characteristics for the generalized tomographic data-acquisition configurations. © 2008 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 18, 307-309, 2008 (Source: International Journal of Imaging Systems and Technology)
Source: International Journal of Imaging Systems and Technology - December 5, 2008 Category: Radiology Authors: Hua Lee Source Type: journals

Correcting image defects of stained glass windowsEmail this article to a colleague. Save this article to My Clippings. Discuss or comment on this article.
The main problem of photographing stained glass windows is setting the correct exposure. An overall average exposure setting frequently results in the highlight areas being overexposed, or dark area being under-exposed, or both. It is therefore necessary to provide a suitable set of image processing tools to correct the image defects. In this work describe several algorithms to solve this problem of nonuniformity of illumination. © 2008 Wiley Periodicals, Inc. Int J Imaging Syst Technol, 18, 296-306, 2008 (Source: International Journal of Imaging Systems and Technology)
Source: International Journal of Imaging Systems and Technology - December 5, 2008 Category: Radiology Authors: S. Suganthan, L. W. MacDonald Source Type: journals