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IEEE Workshop on Stereo and Multi-Baseline vision (SMBV)

作者： T. Pajdla Center for Machine Perception Faculty of Electrical Engineering Czech Technical University Praque Czech Republic

ISBN: (纸本)0769513271

Mosaics acquired by pushbroom cameras, stereo panoramas, omnivergent mosaics, and spherical mosaics can be viewed as images taken by non-central cameras, i.e. cameras that project along rays that do not all intersect at one point. It has been shown that in order to reduce the correspondence search in mosaics to a one-parametric search along curves, the rays of the non-central cameras have to lie in double ruled epipolar surfaces. In this work, we introduce the oblique stereo geometry, which has nonintersecting double ruled epipolar surfaces. We analyze the configurations of mutually oblique rays that see every point in space. We call such configurations oblique cameras. We argue that oblique cameras are important because they are the most non-central cameras among all cameras. We show that oblique cameras, and the corresponding oblique stereo geometry, exist and give an example of a physically realizable oblique stereo geometry.

关键词： Cameras Geometry Layout Image reconstruction Humans Rendering (computer graphics) Mirrors

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三维表面的曲面描述与相似性判别

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中国图象图形学报（A辑） 2001年第2期6卷 199-203页

作者：柳葆芳肖菁平西建邵美珍郑州信息工程大学信息技术学院信息科学系郑州450002

针对三维物体表面的描述和识别问题 ,从描述三维表面变化的基本参数——法向量出发 ,以法向量累积分布曲线 NVCDC为不变量 ,对比较光滑的三维曲面 ,给出了一种描述形状的方法和相似性判别准则 ,并依法向量的方向角将三维空间分割成子空... 详细信息

针对三维物体表面的描述和识别问题 ,从描述三维表面变化的基本参数——法向量出发 ,以法向量累积分布曲线 NVCDC为不变量 ,对比较光滑的三维曲面 ,给出了一种描述形状的方法和相似性判别准则 ,并依法向量的方向角将三维空间分割成子空间 ,然后统计落入每个子空间的法向量个数 ,以得到法向量的分布 ,再将其排序后 ,即得到法向量累积分布曲线 NVCDC.由于与不同的法向量累积分布曲线对应的三维曲面也是不同的 ,所以采用 NVCDC之间的差异为相似性判别准则 ,对不同三维曲面进行了一对一的相似性判别 .为检验该方法的效果 ,还对足底表面进行了实验 ,结果表明。

关键词：计算机视觉法向量法向量累积分布曲线三维表面曲面描述相似性判别

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Curve and surface reconstruction from regular and non-regular point sets

Curve and surface reconstruction from regular and non-regula...

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Conference on computer vision and Pattern Recognition (CVPR)

作者： E. Boyer S. Petitjean GRAVIR-INRIA Montbonnot France Loruia-cnrs Inria Lorraine France

In this paper, we address the problem of curve and surface reconstruction from sets of points. We introduce regular interpolants which are polygonal approximations of planar curves and surfaces verifying a local sampling criterion. Properties of regular interpolants lead to new polygonal reconstruction methods from sets of organized and unorganized points. These methods do not need any parameter of additional information apart from the original points and allow unorganized sets of points to be easily handled.

关键词： Surface reconstruction Image reconstruction Sampling methods Shape computer vision computer graphics Computational geometry Application software Electronic switching systems Image analysis

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Recurrent nasal tumor detection by dynamic MRI

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IEEE ENGINEERING IN MEDICINE AND BIOLOGY MAGAZINE 1999年第4期18卷 100-105页

作者： Huang, WC Hsu, CC Lee, C Lai, PH Chia Nan Coll Pharm & Sci Dept Management Informat Sci Tainan Taiwan

The purpose of this research is to detect and enhance the recurrent nasal tumor region by computing the relative intensity difference between consecutive MR images after using a contrast agent. In this article, we apply a relative signal increase model to recognize a recurrent nasal tumor by dynamic MR images. A robust estimation technique is used to deal with matching corresponding points among different images. The active contour technique is applied to refine automatically the region of interest and obtain a more precise definition of the area of interest. The quantitative evaluation of dynamic MR data is modeled by fitting three-parameter time-intensity curves.

关键词： Neoplasms Magnetic resonance imaging Active contours Biomedical imaging Image converters computer displays Image segmentation Pixel Brain modeling Hopfield neural networks

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Human-assisted system to build 3-D models from a single image

International Conference on Multimedia Computing and Systems...

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International Conference on Multimedia Computing and Systems -Proceedings 1999年 1卷 282-288页

作者： Francois, Alexandre R.J. Medioni, Gerard G. Univ of Southern California Los Angeles United States

We present a system at the junction between computer vision and computer graphics, to produce a 3-D model of an object as observed in a single image, with a minimum of high-level interaction from a user. The input to our system is a single image. First, the user points, coarsely, at image features (edges) that are subsequently automatically and reproducibly extracted in real-time. The user then performs a high level labeling of the curves (e.g. limb edge, cross-section) and specifies relations between edges (e.g. symmetry, surface or part). NURBS are used as working representation of image edges. The objects described by the user specified, qualitative relationships are then reconstructed either as a set of connected parts modeled as Generalized Cylinders, or as a set of 3-D surfaces for 3-D bilateral symmetric objects. In both cases, the texture is also extracted from the image.

关键词： Three dimensional computer graphics

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A system's architecture for warping and morphing of graphical objects

A system's architecture for warping and morphing of graphica...

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International Symposium on computer graphics, Image Processing, and vision (SIBGRAPI 98)

作者： Gomes, J Darsa, L Costa, B Velho, L Inst Matemat Pura & Aplicada BR-22460320 Rio De Janeiro Brazil

ISBN: (纸本)0818692162

This paper describes a system architecture that enables the use of different techniques of warping and morphing applied to various classes of graphical objects (images, surfaces, plane curves, volumetric data, implicit surfaces etc.) Combinations of warping and morphing techniques can lead to more powerful and expressive results. The possibility of experimenting with alternative techniques for distinct classes of graphical objects creates a very flexible and robust warping and morphing system.

关键词： warping morphing interaction graphics system

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A system's architecture for warping and morphing of graphical objects

A system's architecture for warping and morphing of graphica...

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Brazilian Symposium on computer graphics and Image Processing (SIBGRAPI)

作者： J. Gomes L. Darsa B. Costa L. Velho Estrada Dona Castorina 110 IMPA-Instituto de Matematica Pura e Aplicada Rio de Janeiro Rio de Janeiro Brazil Microsoft Corporation Redmond WA USA

关键词： Electrical capacitance tomography computer graphics Shape Application software Animation Biomedical imaging Packaging Software architecture Cameras Rendering (computer graphics)

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Multi-axis roughing and finishing of ruled surface pockets for CAD/CAM systems

Multi-axis roughing and finishing of ruled surface pockets f...

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ASME 1998 Design Engineering Technical Conferences, DETC 1998

作者： Koc, Bahattin Lee, Yuan-Shin Department of Industrial Engineering North Carolina State University RaleighNC27695-7906 United States

ISBN: (纸本)9780791880340

This paper presents a new methodology for 5-axis rough cutting of free-form ruled surface pockets. An Inclined Zig-zag method is proposed to rough cut the core region and an Ellipse-offset method is developed for semi-roughing and finishing the ruled surface pockets. The Ellipse-offset method is developed to calculate the non-constant offset curves for 5- axis tool path planning of rough cutting. Different from the traditional 2 1/2D machining method, the developed Ellipseoffset method allows the cutter to change its tool orientation and to get as close to the part surface as possible in roughing. The proposed method allows the manufacturing engineers to use 5-axis machining to rough cut the parts to near-finish shape for finishing. computer implementation and illustrative examples are also presented in this paper. Copyright © 1998 by ASME.

关键词： computer aided design

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Matching of freeform curves

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computer-AIDED DESIGN 1997年第5期29卷 369-378页

作者： Cohen, S Elber, G BarYehuda, R Department of Computer Science Technion Israel Institute of Technology Haifa 32000 Israel

Freeform parametric curves are extensively employed in various fields such as computer graphics, computer vision, robotics, and geometric modeling. While many applications exploit and combine univariate freeform entities into more complex forms such as sculptured surfaces, the problem of a fair or even optimal relative parameterization of freeforms, under some norm, has been rarely considered. In this work, we present a scheme that closely approximates the optimal relative matching between two or even n given freeform curves, under a user's prescribed norm that is based on differential properties of the curves. This matching is computed as a reparameterization of n-1 of the curves that can be applied explicitly using composition. The proposed matching algorithm is completely automatic and has been successfully employed in different applications with several demonstrated herein: metamorphosis of freeform curves with feature preservations, key frame interpolation for animation, self-intersection free ruled surface construction, and automatic matching of rail curves of blending surfaces. (C) 1997 Elsevier Science Ltd.

关键词： dynamic programming tangent/Gauss map feature recognition fairness

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Parabolic curves of evolving surfaces

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INTERNATIONAL JOURNAL OF computer vision 1996年第3期17卷 291-306页

作者： Bruce, JW Giblin, PJ Tari, E Department of Pure Mathematics The University of Liverpool P.O. Box 147 L6 3BX Liverpool England

In this article we show how certain geometric structures which are also associated with a smooth surface evolve as the shape of the surface changes in a 1-parameter family. We concentrate on the parabolic set and its image under the Gauss map, but the same techniques also classify the changes in the dual of the surface. All these have significance for computer vision, for example through their connection with specularities and apparent contours. With the aid of our complete classification, which includes all the phenomena associated with multi-contact tangent planes as well as those associated with parabolic sets, we re-examine examples given by J. Koenderink in his book (1990) under the title of Morphological Scripts. We also explain some of the connections between parabolic sets and 'ridges' of a surface, where principal curvatures achieve turning values along lines of curvature. The point of view taken is the analysis of the contact between surfaces and their tangent planes. A systematic investigation of this yields the results using singularity theory. The mathematical details are suppressed here and appear in Bruce et al. (1993).

关键词： parabolic curve surface morphogenetic script

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