Medical and Biomedical Researches

Fuzzy vector median-based surface smoothing.

June 28th, 2008
Fuzzy vector median-based surface smoothing. Abstract-This paper proposes a novel approach for smoothing surfaces represented by triangular meshes. The proposed method is a two-step procedure: surface normal smoothing through fuzzy vector median (FVM) filtering followed by integration of surface normals for vertex position update based on ...

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Camera-sampling field and its applications.

June 28th, 2008
Camera-sampling field and its applications. Abstract-In this paper, we propose a novel vector field, called a camera-sampling field, to represent the sampling density distribution of a pinhole camera. We give the derivation and discuss some essential properties of the camera-sampling field, including flux, divergence, curl, gradient, ...

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Eye gaze correction with stereovision for video-teleconferencing.

June 28th, 2008
Eye gaze correction with stereovision for video-teleconferencing. Abstract-The lack of eye contact in desktop video teleconferencing substantially reduces the effectiveness of video contents. While expensive and bulky hardware is available on the market to correct eye gaze, researchers have been trying to provide a practical software-based ...

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Gaussian MRF Rotation-Invariant Features for Image Classification.

June 28th, 2008
Gaussian MRF Rotation-Invariant Features for Image Classification. Abstract-Features based on Markov random field (MRF) models are sensitive to texture rotation. This paper develops an anisotropic circular Gaussian MRF (ACGMRF) model for retrieving rotation-invariant texture features. To overcome the singularity problem of the least squares estimate method, ...

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Contrast definition for optical coherent polarimetric images.

June 28th, 2008
Contrast definition for optical coherent polarimetric images. Abstract-We consider polarimetric images formed with coherent waves, such as in laser-illuminated imagery or synthetic aperture radar. A definition of the contrast between regions with different polarimetric properties in such images is proposed, and it is shown that the ...

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Multiview panoramic cameras using mirror pyramids.

June 28th, 2008
Multiview panoramic cameras using mirror pyramids. Abstract-A mirror pyramid consists of a set of planar mirror faces arranged around an axis of symmetry and inclined to form a pyramid. By strategically positioning a number of conventional cameras around a mirror pyramid, the viewpoints of the cameras\' ...

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A new way to detect arrows in line drawings.

June 28th, 2008
A new way to detect arrows in line drawings. Abstract-A new way of detecting arrows in line drawings is proposed in this paper. We provide a set of criteria which are aggregated using the Choquet integral. These criteria are defined from the geometric properties of an ...

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A new convexity measure for polygons.

June 28th, 2008
A new convexity measure for polygons. Abstract-Convexity estimators are commonly used in the analysis of shape. In this paper, we define and evaluate a new convexity measure for planar regions bounded by polygons. The new convexity measure can be understood as a \"boundary-based\" measure and in ...

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Spectral Filter Optimization for the Recovery of Parameters which Describe Human Skin.

June 28th, 2008
Spectral Filter Optimization for the Recovery of Parameters which Describe Human Skin. Abstract-This paper presents a method for finding spectral filters that minimize the error associated with histological parameters characterizing normal skin tissue. These parameters can be recovered from digital images of the skin using a ...

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Fast branch & bound algorithms for optimal feature selection.

June 28th, 2008
Fast branch & bound algorithms for optimal feature selection. Abstract-A novel search principle for optimal feature subset selection using the Branch & Bound method is introduced. Thanks to a simple mechanism for predicting criterion values, a considerable amount of time can be saved by avoiding many ...

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Camera calibration with one-dimensional objects.

June 28th, 2008
Camera calibration with one-dimensional objects. Abstract-Camera calibration has been studied extensively in computer vision and photogrammetry and the proposed techniques in the literature include those using 3D apparatus (two or three planes orthogonal to each other or a plane undergoing a pure translation, etc.), 2D objects ...

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Higher-order nonlinear priors for surface reconstruction.

June 28th, 2008
Higher-order nonlinear priors for surface reconstruction. Abstract-For surface reconstruction problems with noisy and incomplete range data, a Bayesian estimation approach can improve the overall quality of the surfaces. The Bayesian approach to surface estimation relies on a likelihood term, which ties the surface estimate to the ...

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Skin Color-Based Video Segmentation under Time-Varying Illumination.

June 28th, 2008
Skin Color-Based Video Segmentation under Time-Varying Illumination. Abstract-A novel approach for real-time skin segmentation in video sequences is described. The approach enables reliable skin segmentation despite wide variation in illumination during tracking. An explicit second order Markov model is used to predict evolution of the skin-color ...

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On pose recovery for generalized visual sensors.

June 28th, 2008
On pose recovery for generalized visual sensors. Abstract-With the advances in imaging technologies for robot or machine vision, new imaging devices are being developed for robot navigation or image-based rendering. However, to satisfy some design criterion, such as image resolution or viewing ranges, these devices are ...

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Multiresolution histograms and their use for recognition.

June 28th, 2008
Multiresolution histograms and their use for recognition. Abstract-The histogram of image intensities is used extensively for recognition and for retrieval of images and video from visual databases. A single image histogram, however, suffers from the inability to encode spatial image variation. An obvious way to extend ...

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Focus-of-Attention from Local Color Symmetries.

June 28th, 2008
Focus-of-Attention from Local Color Symmetries. Abstract-In this paper, a continuous valued measure for local color symmetry is introduced. The new algorithm is an extension of the successful gray value-based symmetry map proposed by Reisfeld et al. The use of color facilitates the detection of focus points ...

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The template update problem.

June 28th, 2008
The template update problem. Abstract-Template tracking dates back to the 1981 Lucas-Kanade algorithm. One question that has received very little attention, however, is how to update the template so that it remains a good model of the tracked object. We propose a template update algorithm that ...

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Self-adaptive regularization.

June 28th, 2008
Self-adaptive regularization. Abstract-Often an image g(x,y) is regularized and even restored by minimizing the Mumford-Shah functional. Properties of the regularized image u(x,y) depends critically on the numerical value of the two parameters \\alpha and \\gamma controlling smoothness and fidelity. When \\alpha and \\gamma are constant over ...

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Influence of the noise model on level set active contour segmentation.

June 28th, 2008
Influence of the noise model on level set active contour segmentation. Abstract-We analyze level set implementation of region snakes based on the maximum likelihood method for different noise models that belong to the exponential family. We show that this approach can improve segmentation results in noisy ...

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Automatic writer identification using connected-component contours and edge-based features of upperc

June 28th, 2008
Automatic writer identification using connected-component contours and edge-based features of uppercase Western script. Abstract-In this paper, a new technique for offline writer identification is presented, using connected-component contours (COCOCOs or CO;3s) in uppercase handwritten samples. In our model, the writer is considered to be characterized by ...

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Inference of segmented color and texture description by tensor voting.

June 28th, 2008
Inference of segmented color and texture description by tensor voting. Abstract-A robust synthesis method is proposed to automatically infer missing color and texture information from a damaged 2D image by N\\rm D tensor voting (N > 3). The same approach is generalized to range and 3D ...

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An efficient solution to the five-point relative pose problem.

June 28th, 2008
An efficient solution to the five-point relative pose problem. Abstract-An efficient algorithmic solution to the classical five-point relative pose problem is presented. The problem is to find the possible solutions for relative camera pose between two calibrated views given five corresponding points. The algorithm consists of ...

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Benchmarking a reduced multivariate polynomial pattern classifier.

June 28th, 2008
Benchmarking a reduced multivariate polynomial pattern classifier. Abstract-A novel method using a reduced multivariate polynomial model has been developed for biometric decision fusion where simplicity and ease of use could be a concern. However, much to our surprise, the reduced model was found to have good ...

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Linear Dimensionality Reduction via a Heteroscedastic Extension of LDA: The Chernoff Criterion.

June 28th, 2008
Linear Dimensionality Reduction via a Heteroscedastic Extension of LDA: The Chernoff Criterion. Abstract-We propose an eigenvector-based heteroscedastic linear dimension reduction (LDR) technique for multiclass data. The technique is based on a heteroscedastic two-class technique which utilizes the so-called Chernoff criterion, and successfully extends the well-known linear ...

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Circular motion geometry using minimal data.

June 28th, 2008
Circular motion geometry using minimal data. Abstract-Circular motion or single axis motion is widely used in computer vision and graphics for 3D model acquisition. This paper describes a new and simple method for recovering the geometry of uncalibrated circular motion from a minimal set of only ...

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