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"How many planar viewing surfaces are there in noncentral catadioptric cameras?" Towards singe-image localization of space lines

"How many planar viewing surfaces are there in noncentral ca...

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2006 ieee computer society conference on computer Vision and pattern recognition, CVPR 2006

作者： Caglioti, Vincenzo Gasparini, Simone Italy

ISBN: (纸本)0769525970

In-door environments often contain several straight line segments. The 3D reconstruction of such environments can thus reduce to the localization of lines in the 3D space. Multi-view reconstruction requires the solution of the correspondence problem. The use of a single image to localize space lines is attractive, since the correspondence problem can be avoided. However, using a perspective camera (or a central one), a line can not be localized, since its viewing surface is planar, and hence it can contain infinite lines other than the correct one. In this paper we study the number of planar viewing surfaces for a general class of catadioptric cameras, constituted by an axial symmetric mirror and a perspective camera placed at generic relative position. We show that, under broad conditions, there is only a discrete set of planar viewing surfaces for the considered class of cameras. This result establishes a qualitative difference with respect to axial-symmetric cameras (e.g., catadioptric cameras constituted by an axial-symmetric mirror plus a perspective camera, whose viewpoint is constrained to be on the mirror axis), where an infinite set of planar viewing surfaces exists. Then, some conditions are derived for the localization of lines in the 3D space from single images. Preliminary experiments are also reported. © 2006 ieee.

关键词： image processing

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Learning association fields from natural images

Learning association fields from natural images

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2006 conference on computer Vision and pattern recognition Workshops

作者： Orabona, Francesco Metta, Giorgio Sandini, Giulio LIRA-Lab. DIST University of Genoa Genoa 16145 Italy

ISBN: (纸本)0769526462

Previous studies have shown that it is possible to learn certain properties of the responses of the neurons of the visual cortex, as for example the receptive fields of complex and simple cells, through the analysis of the statistics of natural images and by employing principles of efficient signal encoding from information theory. Here we want to go further and consider how the output signals of 'complex cells' are correlated and which information is likely to be grouped together. We want to learn 'association fields', which are a mechanism to integrate the output of filters with different preferred orientation, in particular to link together and enhance contours. We used static natural images as training set and the tensor notation to express the learned fields. Finally we tested these association fields in a computer model to measure their performance. © 2006 ieee.

关键词： image processing

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Video completion by motion field transfer

Video completion by motion field transfer

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2006 ieee computer society conference on computer Vision and pattern recognition, CVPR 2006

作者： Shiratori, Takaaki Matsushita, Yasuyuki Kang, Sing Bing Tang, Xiaoou University of Tokyo Tokyo Japan Microsoft Research Asia Beijing China Microsoft Research WA United States

ISBN: (纸本)0769525970

Existing methods for video completion typically rely on periodic color transitions, layer extraction, or temporally local motion. However, periodicity may be imperceptible or absent, layer extraction is difficult, and temporally local motion cannot handle large holes. This paper presents a new approach for video completion using motion field transfer to avoid such problems. Unlike prior methods, we fill in missing video parts by sampling spatio-temporal patches of local motion instead of directly sampling color. Once the local motion field has been computed within the missing parts of the video, color can then be propagated to produce a seamless hole-free video. We have validated our method on many videos spanning a variety of scenes. We can also use the same approach to perform frame interpolation using motion fields from different videos. © 2006 ieee.

关键词： Color image processing

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Evaluation of colour image segmentation hierarchies

Evaluation of colour image segmentation hierarchies

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3rd Canadian conference on computer and Robot Vision, CRV 2006

作者： MacDonald, Darren Jochen, Lang McAllister, Michael SITE University of Ottawa Ottawa Ont. Canada Computer Science Dalhousie University Halifax NS Canada

ISBN: (纸本)0769525423

image segmentation is a key low-level vision process for many tasks in image understanding and applications in image processing. The groups of related pixels produced by a segmentation are expected to reveal some information about the objects in a scene. Many equally valid segmentations exist for most images depending on the context of the segmentation, in particular, the level-of-detail. Segmentation hierarchies can represent different level-of-detail simultaneously. In this paper, we employ the Earth Mover's Distance (EMD) as a segmentation criterion in a hierarchical colour segmentation algorithm. The use of EMD is motivated by its success in content-based image retrieval based on colour signatures. We also develop a novel evaluation method which looks at the stability of segmentation hierarchies in stereo images. This evaluation method allows us to compare the EMD segmentation criterion with variants and with criterions based on mean colour. © 2006 ieee.

关键词： image segmentation

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Neighborhood aided implicit active contours

Neighborhood aided implicit active contours

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2006 ieee computer society conference on computer Vision and pattern recognition, CVPR 2006

作者： Liu, Huafeng Chen, Yunmei Chen, Wufan Shi, Pengcheng State Key Laboratory of Modern Optical Instrumentation Zhejiang University Hangzhou China Department of Electrical and Electronic Engineering Hong Kong University of Science and Technology Clear Water Bay Hong Kong Hong Kong Department of Mathematics University of Florida Gainesville FL United States Key Laboratory of Medical Image Processing Southern Medical University Guangzhou China

ISBN: (纸本)0769525970

We have developed a geometric deformable model that employs neighborhood influence to achieve robust segmentation for noisy and broken edges. The fundamental power of this strategy rests with the explicitly combination of regional inter-point constraints, image forces, and a priori boundary information for each geometric contour point within its adaptively determined local influence domain. This formulation thus naturally unifies the essences of the geometric and parametric snakes through automatic local scale selection, and exhibits their respective fundamental strengths of allowing stable boundary detection when the edge information is weak and possibly discontinuous, while maintaining the abilities to handle topological changes during front evolution. In particular, this paper presents an implementation of the method through local integration of the level set function and the image/prior-driven evolution forces, where the resulting partial differential equation is solved numerically using standard finite difference method. Experimental results on synthetic and real images demonstrate its superior performance. © 2006 ieee.

关键词： Edge detection

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BICIR:Boundary-constrained inverse consistent image registration using WEB-splines

BICIR:Boundary-constrained inverse consistent image registra...

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2006 conference on computer Vision and pattern recognition Workshops

作者： Kumar, Dinesh Geng, Xiujuan Hoffman, Eric A. Christensen, Gary E. Department of Electrical and Computer Engineering University of Iowa Iowa City IA 52242 Department of Radiology University of Iowa Iowa City IA 52242

ISBN: (纸本)0769526462

We present a new registration method called boundaryconstrained inverse consistent image registration (BICIR). This method is novel because it performs boundary constrained intensity based image registration by combining surface- and intensity-based registration. The method registers a region of interest and ignores everything outside the region eliminating interference caused by surrounding regions. The boundaries of the two objects are first registered using the transitive inverse-consistent manifold registration (TICMR) described in [4], This provides the boundary conditions, which are used to compute the displacement over the object using the Element Free Galerkin Method (EFGM). The EFGM solution is used as an initialization and is fine-tuned using the intensity information inside the object. The transformations are represented with shape specific basis functions that have local support. These basis functions are defined only over the region of interest and help improve the computational performance. The BICIR method was tested for a number of 2-dimensional test images. The method was validated using the similarity cost, relative overlap and inverse consistency error. © 2006 ieee.

关键词： image processing

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Good continuation in layers: Shading flows, color flows, surfaces and shadows

Good continuation in layers: Shading flows, color flows, sur...

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2006 conference on computer Vision and pattern recognition Workshops

作者： Ben-Shahar, Ohad Glaser, Andreas Zucker, Steven W. Computer Science Ben Gurion University Israel Applied Mathematics Yale University New Haven CT 06520-8285 United States Computer Science Yale University New Haven CT 06520-8285 United States

ISBN: (纸本)0769526462

We extend the concept of good continuation in a uniform fashion from boundaries to shading, hue, and texture. Each has the property that heal measurements yield an orientation, which we explicitly establish for hue using geometric harmonic techniques. Good continuation arises in a geometric sense, because these orientations all vary smoothly in an appropriate sense. Thus they correspond to flows. Taken together they define a layered set of flows, in the sense the "horizontal" computations within each flow provide global consistency while "vertical" computations across flows enable the identification of shading and shadowing and different types of edges. Evidence is reviewed that primate visual systems enjoy such an organization.1 © 2006 ieee.

关键词： image processing

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Multi-scale contour extraction based on natural image statistics

Multi-scale contour extraction based on natural image statis...

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2006 conference on computer Vision and pattern recognition Workshops

作者： Estrada, Francisco J. Elder, James H. Centre for Vision Research York University 4700 Keele St. Toronto Ont. M3J 1P3 Canada

ISBN: (纸本)0769526462

Perceptual grouping of the complete boundaries of objects in natural images remains an unsolved problem in computer vision. The computational complexity of the problem and difficulties capturing global constraints limit the performance of current algorithms. In this paper we develop a coarse-to-fine Bayesian algorithm which addresses these constraints. Candidate contours are extracted at a coarse scale and then used to generate spatial priors on the location of possible contours at finer scales. In this way, a rough estimate of the shape of an object is progressively refined. The coarse estimate provides robustness to texture and clutter while the refinement process allows for the extraction of detailed object contours. The grouping algorithm is probabilistic and uses multiple grouping cues derived from natural scene statistics. We present a quantitative evaluation of grouping performance on the Berkeley Segmentation Database, and show that the multi-scale approach outperforms several single-scale contour extraction algorithms. © 2006 ieee.

关键词： image processing

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How do movie viewers perceive scene structure from dynamic cues

How do movie viewers perceive scene structure from dynamic c...

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2006 ieee computer society conference on computer Vision and pattern recognition, CVPR 2006

作者： Cheong, Loong-Fah Xiang, Xu Department of Electrical and Computer Engineering National University of Singapore 4 Engineering Drive 3 Singapore 117576 Singapore

ISBN: (纸本)0769525970

Cinema viewed from a location other than a Canonical Viewing Point (CVP) presents distortions to the viewer in both its static and dynamic aspects. Past works have investigated mainly the static aspect of this problem and attempted to explain why viewers still seem to perceive the scene very well. The dynamic aspect of depth perception, which is known as structure from motion, and its possible distortion, have not been well investigated. In this paper, we derive the dynamic depth cues perceived by the viewer and use the so-called iso-distortion framework to understand its distortion. The result is that viewers seated at a reasonably central position experience a shift in the intrinsic parameters of their visual systems. Despite this shift, the key properties of the perceived depths remain largely the same, being determined in the main by the accuracy to which extrinsic motion parameters can be recovered. For a viewer seated at a non-central position and watching the movie screen with a slant angle, the view is related to the view at the CVP by a homography, resulting in various aberrations such as non-central projection. © 2006 ieee.

关键词： image processing

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Making a long video short: Dynamic video synopsis

Making a long video short: Dynamic video synopsis

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2006 ieee computer society conference on computer Vision and pattern recognition, CVPR 2006

作者： Rav-Acha, Alex Pritch, Yael Peleg, Shmuel School of Computer Science and Engineering Hebrew University of Jerusalem 91904 Jerusalem Israel

ISBN: (纸本)0769525970

The power of video over still images is the ability to represent dynamic activities. But video browsing and retrieval are inconvenient due to inherent spatio-temporal redundancies, where some time intervals may have no activity, or have activities that occur in a small image region. Video synopsis aims to provide a compact video representation, while preserving the essential activities of the original video. We present dynamic video synopsis, where most of the activity in the video is condensed by simultaneously showing several actions, even when they originally occurred at different times. For example, we can create a "stroboscopic movie", where multiple dynamic instances of a moving object are played simultaneously. This is an extension of the still stroboscopic picture. Previous approaches for video abstraction addressed mostly the temporal redundancy by selecting representative key-frames or time intervals. In dynamic video synopsis the activity is shifted into a significantly shorter period, in which the activity is much denser. Video examples can be found online in http://***/synopsis © 2006 ieee.

关键词： Video signal processing

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