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A new segmentation method for MRI images of the shoulder joint

A new segmentation method for MRI images of the shoulder joi...

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4th canadian conference on computer and robot vision, crv 2007

作者： Nguyen, Nhat Tan Laurendeau, Denis Branzan-Albu, Alexandra Computer Vision and Systems Laboratory Laval University Que. Canada Computer Vision Laboratory University of Victoria Vic. Canada

ISBN: (纸本)0769527868

this paper presents an integrated region-based and gradient-based supervised method for segmentation of a patient magnetic resonance images (MRI) of the shoulder joint. the method is noninvasive, anatomy-based and requires only simple user interaction. It is generic and easily customizable for a variety of routine clinical uses in orthopedic surgery. © 2007 IEEE.

关键词： Image segmentation

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Dense stereo range sensing with marching pseudo-random patterns

Dense stereo range sensing with marching pseudo-random patte...

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4th canadian conference on computer and robot vision

作者： Desjardins, Danick Payeur, Pierre Univ Ottawa Sch Informat Technol & Engn Ottawa ON Canada

ISBN: (纸本)9780769527864

As an extension to classical structured lighting techniques, the use of bi-dimensional pseudo-random color codes is explored to perform range sensing with variable density from a stereo calibrated rig and a projector. Pseudo-random codes are used to create artificial textures on a scene which are extracted and grouped in a confidence map to ensure reliable feature matching between pairs of images taken from two cameras. Depth estimation is performed on corresponding points with progressive refinement as the pseudo-random pattern projection is marched over the scene to increase the density of matched features, and achieve dense 3D reconstruction. the potential of hi-dimensional pseudo-random color patterns for structured lighting is demonstrated in terms of patterns computation, ease of extraction, matching confidence level, as well as density of depth estimation for 3D reconstruction.

关键词： Image reconstruction Reflective binary codes Layout Cameras Pattern matching Surface reconstruction Calibration robot vision systems Surface texture Gray-scale

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A non-myopic approach to visual search

A non-myopic approach to visual search

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4th canadian conference on computer and robot vision

作者： Vogel, Julia Murphy, Kevin Univ British Columbia Dept Comp Sci Vancouver BC V6T 1W5 Canada

ISBN: (纸本)9780769527864

We show how a greedy approach to visual search - i.e., directly moving to the most likely location of the target - can be suboptimal, if the target object is hard to detect. Instead it is more efficient and leads to higher detection accuracy to first look for other related objects, that are easier to detect. these provide contextual priors for the target that make it easier to find. We demonstrate this in simulation using POMDP models, focussing on two special cases: where the target object is contained within the related object, and where the target object is spatially adjacent to the related object.

关键词： computer vision

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Fourier tags:Smoothly degradable fiducial markers for use in human-robot interaction

Fourier tags:Smoothly degradable fiducial markers for use in...

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4th canadian conference on computer and robot vision

作者： Sattar, Junaed Bourque, Eric Giguere, Philippe Dudek, Gregory McGill Univ Comp Sci Montreal PQ Canada Univ Montreal DIRO Montreal PQ Canada

ISBN: (纸本)9780769527864

In this paper we introduce the Fourier tag, a synthetic fiducial marker used to visually encode information and provide controllable positioning. the Fourier tag is a synthetic target akin to a bar-code that specifies multi-bit information which can be efficiently and robustly detected in an image. Moreover the Fourier tag has the beneficial property that the bit string it encodes has variable length as a function of the distance between the camera and the target. this follows from the fact that the effective resolution decreases as an effect of perspective. this paper introduces the Fourier tag, describes its design, and illustrates its properties experimentally

关键词： Human computer interaction

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Proceedings - Fourth canadian conference on computer and robot vision, crv 2007

Proceedings - Fourth Canadian Conference on Computer and Rob...

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4th canadian conference on computer and robot vision, crv 2007

ISBN: (纸本)0769527868

the proceedings contain 63 papers. the topics discussed include: extrinsic recalibration in camera networks;screen camera calibration using a spherical mirror;a simple operator for very precise estimation of ellipses;training database adequacy analysis for learning-based super-resolution;extracting salient objects from operator-framed images;learning saccadic gaze control via motion prediction;efficient camera motion and 3D recovery using an inertial sensor;can Lucas-Kanade be used to estimate motion parallax in 3D cluttered scenes;local graph matching for object category recognition;efficient registration of 3D SPHARM surfaces;computing view-normalized body parts trajectories;automated detection of mitosis in embryonic tissues;computer assisted detection of polycystic ovary morphology in ultrasound images;automatic detection and clustering of actor faces based on spectral clustering techniques;and petri net-based cooperation in multi-agent systems.

关键词： computer vision

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Non-uniform hierarchical geo-consistency for multi-baseline stereo

Non-uniform hierarchical geo-consistency for multi-baseline ...

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4th canadian conference on computer and robot vision

作者： Drouin, Marc-Antoine Trudeau, Martin Roy, Sebastien Univ Montreal DIRO Montreal PQ H3C 3J7 Canada

ISBN: (纸本)9780769527864

We propose a new and flexible hierarchical multi-baseline stereo algorithm that features a non-uniform spatial decomposition of the disparity map. the visibility computation and refinement of the disparity map are integrated into a single iterative framework that does not add extra constraints to the cost function. this makes it possible to use a standard efficient stereo matcher during each iteration. the level of refinement is increased automatically where it is needed in order to preserve a good localization of boundaries. While two graph-theoretic stereo matchers are used in our experiments, our framework is general enough to be applied to many others. the validity of our framework is demonstrated using real imagery with ground truth.

关键词： Stereo vision

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Terrain modelling for planetary exploration

Terrain modelling for planetary exploration

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4th canadian conference on computer and robot vision

作者： Rekleitis, Loannis Bedwani, Jean-Luc Gemme, Sebastien Lamarche, Tom Dupuis, Erick Canadian Space Agcy 6767 Route Aerport St Hubert PQ J3Y 8YP Canada

ISBN: (纸本)9780769527864

the success of NASA's Mars Exploration Rovers has demonstrated the important benefits that mobility adds to planetary exploration. Very soon, mission requirements will impose that planetary exploration rovers drive autonomously in unknown terrain. this will require an evolution of the methods and technologies currently used. this paper presents our approach to 3D terrain reconstruction from large sparse range data sets, and the data reduction achieved through decimation. the outdoor experimental results demonstrate the effectiveness of the reconstructed terrain model for different types of terrain. We also present a first attempt to classify the terrain based on the scans properties.

关键词： Planetary surface analysis

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Automatic annotation of humans in surveillance video

Automatic annotation of humans in surveillance video

引用

4th canadian conference on computer and robot vision

作者： Hansen, D. M. Mortensen, B. K. Duizer, P. T. Andersen, J. R. Moeslund, T. B. Aalborg Univ Lab Comp Vis & Media Technol Aalborg Denmark

ISBN: (纸本)9780769527864

In this paper we present a system for automatic annotation of humans passing a surveillance camera. Each human has 4 associated annotations: the primary color of the clothing, the height, and focus of attention. the annotation occurs after robust background subtraction based on a Codebook representation. the primary colors of the clothing are estimated by grouping similar pixels according to a body model. the height is estimated based on a 3D mapping using the head and feet. Lastly, the focus of attention is defined as the overall direction of the head, which is estimated using changes in intensity at four different positions. Results show successful detection and hence successful annotation for most test sequences. ©2007 IEEE.

关键词： computer vision

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INVICON:: A toolkit for knowledge-based control of vision systems

INVICON:: A toolkit for knowledge-based control of vision sy...

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4th canadian conference on computer and robot vision

作者： Borzenko, Olena Lesperance, Yves Jenkin, Michael York Univ Comp Sci & Engn 4700 Keele St Toronto ON M3J 1P3 Canada

ISBN: (纸本)9780769527864

To perform as desired in a dynamic environment a vision system must adapt to a variety of operating conditions by selecting vision modules, tuning their parameters, and controlling image acquisition. Knowleage-based (KB) controller-agents that reason over explicitly represented knowledge and interact with their environment can be used for this task;however the lack of a unifying methodology and development tools makes KB controllers difficult to create, maintain, and reuse. this paper presents the INVICON toolkit, based on the IndiGolog agent programming language with elements from control theory. It provides a basic methodology, a vision module declaration template, a suite of control components, and support tools for KB controller development. We have evaluated INVICON in two case studies that involved controlling vision-based pose estimation systems. the case studies show that INVICON reduces the effort needed to build. KB controllers for challenging domains and improves their flexibility and robustness.

关键词： Gesture recognition

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A prototype no-reference video quality system

A prototype no-reference video quality system

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4th canadian conference on computer and robot vision

作者： Dosselmann, Richard Yang, Xue Dong Univ Regina Dept Comp Sci Regina SK S4S 0A2 Canada TR Labs Regina SK S4S 7H9 Canada

ISBN: (纸本)9780769527864

this paper introduces a number of innovative no-reference algorithms to assess the perceived quality of real-time analog and digital television and video streams. A prototype system is developed to locate and measure the impact of three types of impairments that commonly impair television and video signals. Analog sequences are tested for the presence of random noise. In the case of digital signals, two fundamental types of errors are of interest. the first is the blocking artifact that is so pervasive among DCT-based compression schemes such as MPEG. the second category includes errors caused by random changes to the bit stream of a signal. Of the various forms that these distortions may take on, only those that appear as "colored blocks " are detected by this system. Ideas to address the remaining issues are discussed.

关键词： video quality system no-reference metric level of detail random noise MPEG blocking macroblocking

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