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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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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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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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curves and surfaces in computer vision and graphics iii

Curves and Surfaces in Computer Vision and Graphics III

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curves and surfaces in computer vision and graphics iii

This conference proceedings contain 33 papers. The main subjects are: Wavelets and approximation theory, mathematical techniques, curves and surfaces, surface reconstruction techniques, geometric modeling, and surface... 详细信息

ISBN: (纸本)0819410314

关键词： computer graphics

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New, faster, more controlled fitting of implicit polynomial 2D curves and 3D surfaces to data

New, faster, more controlled fitting of implicit polynomial ...

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Conference on computer vision and Pattern Recognition (CVPR)

作者： Zhibin Lei D.B. Cooper Division of Engineering Brown University Providence RI USA

Denote a point in the plane by z=(z,y) and a polynomial of nth degree in z by f(z) /spl Sigma//sub i,j//spl ges/o/sub 1/i+j/spl les/n(a/sub ij/x/sup i/y/sup j/). Denote by Z(f) the set of points for which f(z)=0. Z(f) is the 2D curve represented by f(z). In this paper, we present a new approach to fitting 2D curves to data in the plane (or 3D surfaces to range data) which has significant advantages over presently known methods. It requires considerably less computation and the resulting curve can be forced to lie close to the data set at prescribed points provided that there is an nth degree polynomial that can reasonably approximate the data. Linear programming is used to do the fitting. The approach can incorporate a variety of distance measures and global geometric constraints.

关键词： Surface fitting Curve fitting Polynomials Linear programming Data engineering Databases Shape computer graphics Geometrical optics Object recognition

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Curve and surface interpolation using rational radial basis functions

Curve and surface interpolation using rational radial basis ...

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International Conference on Pattern Recognition

作者： Wen-Hung Liao J.K. Aggarwal Computer and Vision Research Center Department of Electrical and Computer Engineering University of Texas Austin Austin TX USA University of Texas at Austin Austin TX US

This paper addresses the problem of reconstructing two-dimensional curves and three-dimensional surfaces from scattered, sparse measurements. We extend the rational Gaussian (RaG) functions introduced by Goshtasby (1993) to general rational radial basis functions and develop a method to compute the smoothness parameters for the shape model by considering the adjacency relation of the control points. Experimental results demonstrate substantial improvements over the original RaG-based method when the input data is sparse and the distribution of the control points is highly nonuniform.

关键词： Interpolation computer vision Biological system modeling Scattering Shape control computer graphics Optimization methods USA Councils Electric variables measurement Numerical analysis

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PARAMETRIZATION OF CLOSED surfaces FOR 3-D SHAPE-DESCRIPTION

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computer vision AND IMAGE UNDERSTANDING 1995年第2期61卷 154-170页

作者： BRECHBUHLER, C GERIG, G KUBLER, O Communication Technology Laboratory Image Science Swiss Federal Institute of Technology (ETH) CH-8092 Zurich Switzerland

This paper presents procedures for the explicit parametric representation and global description of surfaces of simply connected 3-D objects. The novel techniques overcome severe limitations of earlier methods (restriction to star-shaped objects (D. H. Ballard and Ch. M. Brown, computer vision, Prentice-Hall, Englewood Cliffs, NJ, 1981), constraints on positioning and shape of cross-sections (F. Solina and R. Bajcsy, IEEE Trans. Pattern Anal. Mach. Intell. 12(2), 1990, 131-147;L. H. Staib and J. S. Duncan, in Visualization in Biomedical Computing 1992 (R. A. Robb, Ed.), Vol. Proc. SPIE 108, pp. 90-104, 1992), and nonhomogeneous distribution of parameter space). We parametrize the surface by defining a continuous, one-to-one mapping from the surface of the original object to the surface of a unit sphere. The parametrization is formulated as a constrained optimization problem. Practicable starting values are obtained by an initial mapping based on a heat conduction model. The parametrization enables us to expand the object surface into a series of spherical harmonic functions, extending to 3-D the concept of elliptical Fourier descriptors for 2-D closed curves (E. Persoon and K. S. Fu, IEEE Trans. Syst. Man Cybernetics 7(3), 1977, 388-397;F. P. Kuhl and Ch. R. Giardina, Comput. graphics Image Process. 18(3), 1982, 236-258). Invariant, object-centered descriptors are obtained by rotating the parameter net and the object into standard positions. The new methods are illustrated with 3-D test objects. Potential applications are recognition, classification, and comparison of convoluted surfaces or parts of surfaces of 3-D shapes. (C) 1995 Academic Press, Inc,

关键词： Object recognition

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Verification and reconciliation of virtual world model for radioactive waste cleanup

Verification and reconciliation of virtual world model for r...

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Intelligent Robots and computer vision XIV: Algorithms, Techniques, Active vision, and Materials Handling

作者： Wang, Sharon X. Haddox, Dean Crane iii, Carl D. Tulenko, James S. Univ. of Florida Amherst MA USA

ISBN: (纸本)0819419524

The main task of sensing for robotics and automation is to provide 3D geometrical environment information to robot control and visualization systems, which is often referred as facility characterization or environment mapping. Particularly in radioactive waste cleanup operations, such as the Tank Waste Retrieval (TWR) task where the environment is hazardous, automated sensing techniques are necessary for accurate facility characterization that will be used by remote controlled robots for a safe and orderly cleanup process. This research proposes a facility characterization system which combines the strength of computer vision and computer graphics and which maximizes the use of a priori information. Using a novel image registration method, this system is able to detect the difference between the pre-modeled virtual world and sensed real world. Combined with 3D sensing data, the information can be used for verification and reconciliation of the virtual world database. In the proposed system, the environment is pre-modeled as the virtual world. This virtual world database provides the template for the virtual/real world registration. Once the virtual/real images are registered, the comparison can be accomplished by image subtraction. As the result of the comparison, any missing objects or unanticipated objects will be detected. Utilizing the 3D information, the surfaces of these objects can be reconstructed. This information in turn is used for geometric primitives detection and virtual world updating. The initial testing demonstrates that this system has potential to accomplish the TWR task.

关键词： Radioactive wastes

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