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检索条件"任意字段=2006 IEEE Computer Society Conference on Computer Vision and Pattern Recognition, CVPR 2006"

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A shock grammar for recognition

A shock grammar for recognition

引用

conference on computer vision and pattern recognition (cvpr)

作者： K. Siddiqi B.B. Kimia Department of Electrical Engineering McGill University Montreal QUE Canada Division of Engineering Brown University Providence RI USA

We confront the theoretical and practical difficulties of computing a representation for two-dimensional shape, based on shocks or singularities that arise as the shape's boundary is deformed. First, we develop subpixel local detectors for finding and classifying shocks. Second, to show that shock patterns are not arbitrary but obey the rules of a grammar, and in addition satisfy specific topological and geometric constraints. Shock hypotheses that violate the grammar or are topologically or geometrically invalid are pruned to enforce global consistency. Survivors are organized into a hierarchical graph of shock groups computed in the reaction-diffusion space, where diffusion plays a role of regularization to determine the significance of each shock group. The shock groups can be functionally related to the object's parts, protrusions and bends, and the representation is suited to recognition: several examples illustrate its stability with rotations, scale changes, occlusion and movement of parts, even at very low resolutions.

关键词： Electric shock Shape Detectors Stability Databases Humans Birds Proposals Engine cylinders Skeleton

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Gauging relational consistency and correcting structural errors

Gauging relational consistency and correcting structural err...

引用

conference on computer vision and pattern recognition (cvpr)

作者： R.C. Wilson E.R. Hancock Department of Computer Science University of York York UK

The aim of this paper is to provide a comparative evaluation of a number of contrasting approaches to relational matching. Unique to this study is the way in which we show how a diverse family of algorithms relate to one-another using a common Bayesian framework. Broadly speaking there are two main aspects to this study. Firstly we focus on the issue of how relational inexactness may be quantified. We illustrate that several popular relational distance measures can be recovered as specific limiting cases of the same Bayesian consistency measure. The second aspect of our comparison concerns the way in which structural inexactness is controlled. We investigate three different realisations of the matching process which draw on contrasting control models. The main conclusion of our study is that the active process of graph-editing outperforms the alternatives in terms of its ability to effectively control a large population of contaminating clutter.

关键词： Error correction Bayesian methods Pollution measurement Filtering computer errors computer science Measurement uncertainty Image segmentation Associative memory Turning

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A combined physical and statistical approach to colour constancy

A combined physical and statistical approach to colour const...

引用

conference on computer vision and pattern recognition (cvpr)

作者： G. Schaefer S. Hordley G. Finlayson School of Computing and Informatics Nottingham Trent University UK School of Computing Sciences University of East Anglia UK

Computational colour constancy tries to recover the colour of the scene illuminant of an image. Colour constancy algorithms can, in general, be divided into two groups: statistics-based approaches that exploit statistical knowledge of common lights and surfaces, and physics-based algorithms which are based on an understanding of how physical processes such as highlights manifest themselves in images. A combined physical and statistical colour constancy algorithm that integrates the advantages of the statistics-based colour by correlation method with those of a physics-based technique based on the dichromatic reflectance model is introduced. In contrast to other approaches not only a single illuminant estimate is provided but a set of likelihoods for a given illumination set. Experimental results on the benchmark Simon Fraser image database show the combined method to clearly outperform purely statistical and purely physical algorithms.

关键词： Neural networks Layout Reflectivity Lighting Image databases computer vision Informatics Color Correlation Digital cameras

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Recognizing three-dimensional objects by comparing two-dimensional images

Recognizing three-dimensional objects by comparing two-dimen...

引用

conference on computer vision and pattern recognition (cvpr)

作者： D.P. Huttenlocher L.M. Lorigo Computer Science Department Cornell University Ithaca NY USA Artificial Intelligence Laboratory Massachusetts Institute of Technology Cambridge MA USA

In this paper we address the problem of recognizing an object from a novel viewpoint, given a single "model" view of that object. As is common in model-based recognition, objects and images are represented as sets of feature points. We present an efficient algorithm for determining whether two sets of image points (in the plane) could be projections of a common object (a three-dimensional point set). The method relies on the fact that two sets of points in the plane are orthographic projections of the same three-dimensional point set exactly when they have a common projection onto a line. This is a form of the well-known epipolar constraint used in stereopsis. Our algorithm can be used to recognize an object by comparing a stored two-dimensional view of the object against an unknown view, without requiring the correspondence between points in the views to be known a priori. We provide some examples illustrating the approach.

关键词： Image recognition Contracts computer science Shape Fellows Hip Artificial intelligence Object recognition Solid modeling Data mining

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Face verification across age progression

Face verification across age progression

引用

conference on computer vision and pattern recognition (cvpr)

作者： N. Ramanathan R. Chellappa ECE Department University of Maryland College Park USA

Human faces undergo considerable amount of variations with aging. While studies have revealed the extent to which factors such as illumination variations, pose variations, facial expression and occlusions affect face recognition, the role of natural factors such as aging effects in affecting the same are yet to be studied. How does age progression affect the similarity between two images of an individual? What is the confidence associated with establishing the identity between two age separated face images of an individual? On a database of pairs of passport images, we study similarity of faces as a function time. We propose a Bayesian age-difference classifier that is built on a probabilistic eigenspaces framework. Since age separated face images invariably differ in illumination and have facial variations due to aging, we propose a method to overcome non uniform illumination across face images. The problem discussed in this paper has direct applications in passport renewal and homeland security.

关键词： Aging Face recognition Humans Shape Lighting Face detection Educational institutions Image databases Capacitive sensors Pixel

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On the number of digital straight lines on an N*N grid

On the number of digital straight lines on an N*N grid

引用

conference on computer vision and pattern recognition (cvpr)

作者： M. Lindenbaum J. Koplowitz A. Bruckstein Department of Electrical Engineering Technion-Israel Institute of Technology Haifa Israel Department of Electrical and Computer Engineering Clarkson University Potsdam NY USA

The number of different digital straight lines on an N*N square pixel array is studied. The problem is equivalent to finding the number of linear dichotomies of a planar set of N/sup 2/ points of an N*N grid. For any planar set of points, adjacent pairs are defined to be pairs of points from the set such that no other point from the set lie on the line segment between them. A one-to-one correspondence between linear dichotomies and adjacent pairs is proved. Then, the adjacent pairs of points of an N*N grid are counted, and the number of linear dichotomies, as well as the number of digital straight lines, follows. An asymptotic evaluation is proved and an efficient algorithm for finding L(N) for any particular N is given.< >

关键词： Pixel pattern recognition Joining ieee

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Camera stability problem and dynamic stereo vision

Camera stability problem and dynamic stereo vision

引用

conference on computer vision and pattern recognition (cvpr)

作者： S. Moezzi S.L. Bartlett T.E. Weymouth Artificial Intelligence Laboratory University of Michigan Ann Arbor MI USA

The authors show how stereo-based range data, obtained over time by a moving vehicle can be integrated without the explicit knowledge or computation of camera motion. A unique aspect of the approach is the transformation of range information into relative distances and encoding these distances in image registered maps. Results of experiments on dynamic stereo images, are presented.< >

关键词： Cameras Stability Stereo vision Vehicle dynamics Navigation Image sequences Layout Artificial intelligence Laboratories Intelligent vehicles

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A Real-Time Human Stress Monitoring System Using Dynamic Bayesian Network

A Real-Time Human Stress Monitoring System Using Dynamic Bay...

引用

ieee computer society conference on computer vision and pattern recognition Workshops (cvprW)

作者： Wenhui Liao Weihong Zhang Zhiwei Zhu Qiang Ji Department of Electrical Computer and Systems Engineering Rensselaer Polytechnic Institute Troy NY USA

We present a real time non-invasive system that infers user stress level from evidences of different modalities. The evidences include physical appearance (facial expression, eye movements, and head movements) extracted from video via visual sensors, physiological conditions collected from an emotional mouse, behavioral data from user interaction activities with the computer, and performance measures. We provide a Dynamic Bayesian Network (DBN) framework to model the user stress and these evidences. We describe the computer vision techniques we used to extract the visual evidences, the DBN model for modeling stress and the associated factors, and the active sensing strategy to collect the most informative evidences for efficient stress inference. Our experiments show that the inferred user stress level by our system is consistent with that predicted by psychological theories.

关键词： Real time systems Stress Bayesian methods Human factors Data mining Biomedical monitoring Mice Physics computing computer vision Psychology

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Modelling reflections via multiperspective imaging

Modelling reflections via multiperspective imaging

引用

conference on computer vision and pattern recognition (cvpr)

作者： Jingyi Yu L. McMillan Massachusetts Institute of Technology Cambridge MA USA University of North Carolina Chapel Hill Chapel Hill NC USA

We present a novel method for analyzing reflections on arbitrary surfaces. We model reflections using a broader than usual class of imaging models, which include both perspective and multiperspective camera types. We provide an analytical framework to locally model reflections as specific multiperspective cameras around every ray based on a new theory of general linear cameras. Our framework better characterizes the complicated image distortions seen on irregular mirror surfaces as well as the conventional catadioptric mirrors. We show the connection between multiperspective camera models and caustic surfaces of reflections and demonstrate how they reveal important surface rulings of the caustics. Finally, we show how to use our analysis to assist mirror design and characterize distortions seen in catadioptric imaging systems.

关键词： Optical reflection Cameras Mirrors Optical imaging Image analysis computer vision Optical distortion Potential well Physics Geometry

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Autonomous fixation

Autonomous fixation

引用

conference on computer vision and pattern recognition (cvpr)

作者： M.A. Taalebinezhaad MIT Artificial Intelligence Laboratory Cambridge MA USA

The author previously introduced a direct method, called fixation, for the recovery of shape and motion in the general case that uses neither feature correspondence nor optical flow. Instead, it directly uses the spatio-temporal gradients of image brightness. The experimental results of applying some of the author's fixation algorithms to a sequence of real images, where the motion is a combination of translation and rotation, are reported. Techniques for autonomous choice of parameters that result in good estimates for important motion parameters are described.< >

关键词： Shape Brightness Equations Vectors Artificial intelligence Laboratories Motion estimation Image motion analysis computer vision Optical computing

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