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Proceedings of 13th International Conference on Pattern Recognition

Volume 1 • 25-29 Aug. 1996

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  • Proceedings of 13th International Conference on Pattern Recognition

    Publication Year: 1996
    Request permission for reuse | PDF file iconPDF (631 KB)
    Freely Available from IEEE
  • Fragment grouping via the principle of perceptual occlusion

    Publication Year: 1996, Page(s):3 - 8 vol.1
    Cited by:  Papers (9)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    Bounding contours of physical objects are often fragmented by other occluding objects. Long-distance perceptual grouping seeks to join fragments belonging to the same object. Approaches to grouping based on invariants assume objects are in restricted classes, while those based on minimal energy continuations assume a shape for the missing contours and require this shape to drive the grouping proce... View full abstract»

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  • Using crest lines to guide surface reconstruction from stereo

    Publication Year: 1996, Page(s):9 - 13 vol.1
    Cited by:  Papers (10)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (458 KB)

    We propose an approach to interleave surface reconstruction from multiple images and feature extraction. It uses an object-centered representation that is optimized to conform to the surface shape. It also extracts typical features such as crest lines and uses them to guide the optimization. We present results using aerial images and terrain data. View full abstract»

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  • 3D part segmentation using simulated electrical charge distributions

    Publication Year: 1996, Page(s):14 - 18 vol.1
    Cited by:  Papers (5)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    A novel approach to 3D part segmentation is presented. Beginning with range data of a 3D object, we simulate the charge density distribution over an object's surface which has been tessellated by a triangular mesh. We then locate the object part boundary at deep surface concavities by tracing local charge density minima. Finally, we decompose the object into parts at the part boundary points. View full abstract»

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  • Recognition and learning with polymorphic structural components

    Publication Year: 1996, Page(s):19 - 23 vol.1
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (614 KB)

    We address the problem of describing, recognizing, and learning generic, free-form objects in real-world scenes. An appearance-based system using weak-structure and evidence accumulation where object models are implicitly encoded in a learned decision tree and objects are represented in graph form as in the method developed by Bischof and Caelli (1994). The decision tree is used to classify sequen... View full abstract»

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  • Learning by a generation approach to appearance-based object recognition

    Publication Year: 1996, Page(s):24 - 29 vol.1
    Cited by:  Papers (9)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (657 KB)

    We propose a methodology for the generation of learning samples in appearance-based object recognition. In many practical situations, it is not easy to obtain a large number of learning samples. The proposed method learns object models from a large number of generated samples derived from a small number of actually observed images. The learning algorithm has two steps: 1) generation of a large num... View full abstract»

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  • Assessing feature importance for verification and pose refinement

    Publication Year: 1996, Page(s):30 - 34 vol.1
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (527 KB)

    Object recognition can be defined as consisting of two main stages: indexing and verification, Indexing has received much attention in the literature with many schemes developed. However verification has received less attention and is generally used in its simplest form. This paper discusses evaluation techniques for assessing features in the context of verification and pose refinement strategies.... View full abstract»

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  • Quantifying the reliability of feature-based object recognition

    Publication Year: 1996, Page(s):35 - 39 vol.1
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (563 KB)

    We propose a technique for predicting the number of features that should be extracted from an image to guarantee reliable recognition in various feature-based recognition tasks. Our technique relies on the tools from learning theory, namely, the PAC learning framework and VC-dimension analysis. We derive the upper bounds on the required number of feature measurements for recognition tasks over the... View full abstract»

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  • Gabor space and the development of preattentive similarity

    Publication Year: 1996, Page(s):40 - 44 vol.1
    Cited by:  Papers (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    We show that a certain class of similarity measures, which is based on set-theoretic concepts, and explains many of the characteristics of human similarity assessment, can be interpreted as a distance in a suitable psychological space. This view unifies a number of different measures of similarity that psychological experiments have determined to be active in humans for different classes of stimul... View full abstract»

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  • Affine differential signatures for gray level images of planar shapes

    Publication Year: 1996, Page(s):45 - 49 vol.1
    Cited by:  Papers (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    A framework for generating differential affine invariant signatures based on the gray level images of planar shapes is introduced. Invariant signatures and their corresponding arclengths are computed for planar shapes. These signatures are useful for pattern recognition and classification under partial occlusion. We deal with implementable signatures, which practically means using up to second ord... View full abstract»

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  • A new operator for describing topographical image structure

    Publication Year: 1996, Page(s):50 - 54 vol.1
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (559 KB)

    To develop a computer vision system, it is necessary to define a proper image structure representation to be used for interpreting images efficiently. In this paper, we propose a new operator called shape operator for describing topographical image structure. We consider an image function as a surface, then describe a shape of each pixel comparing with its neighbourhood in terms of topographical s... View full abstract»

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  • Fast analytical medial-axis localization in convex polyhedra

    Publication Year: 1996, Page(s):55 - 61 vol.1
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (646 KB)

    The topography (not the field of radius values) of the medial axis of a convex d-dimensional polyhedron can be represented by: (1) The (2- to (d+1)-fold) intersections of internal Voronoi cell polyhedron hyperfaces. (2) The locus of first derivation discontinuities on the distance transform (DT). (3) A cross-linked tree of intersections, with the DT maximum as root, the polyhedron hyperfaces and e... View full abstract»

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  • Sensitivity analysis for structural matching

    Publication Year: 1996, Page(s):62 - 66 vol.1
    Cited by:  Papers (4)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (498 KB)

    The aim of this paper is to explore the sensitivity of relational matching to attribute and structural information. Broadly speaking there are two main aspects to this study. First, we determine the relative importance of attribute and structural information in matching noise corrupted graphs. The second aspect of our analysis concerns the nature of the relational structures used in matching. Here... View full abstract»

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  • Seeing the obvious [robot vision]

    Publication Year: 1996, Page(s):67 - 72 vol.1
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (638 KB)

    We propose an approach to determine the occurrence of low-parametric qualitative models from images by a hypothesis-and-test approach based on the coincidence of multiple cues, thereby avoiding complete reconstruction of the scene. A system is presented which applies the approach to finding instances of planar surfaces, as it is important in many tasks for mobile or manipulating robots. The system... View full abstract»

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  • Selection of reference views for image-based representation

    Publication Year: 1996, Page(s):73 - 77 vol.1
    Cited by:  Papers (7)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    Recently, much attention has been devoted to image-based scene representations. They allow one to construct an arbitrary view of a 3D scene by the interpolation (transfer) from a sparse set of real 2D (reference) images, rather than by rendering an explicit 3D model. While many authors address mainly the purely geometrical aspect of the task, we focus on the problem of how to select the optimal se... View full abstract»

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  • Registration of CAD-models to images by iterative inverse perspective matching

    Publication Year: 1996, Page(s):78 - 83 vol.1
    Cited by:  Papers (43)  |  Patents (29)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    A new algorithm for registering a 3D model to a single or a sequence of 2D images without a-priori knowledge of correspondences is presented. The algorithm is composed of two iterated steps: the first step determines correspondences between image features and model data, while the second one computes the 3D rigid body transformation that minimizes the displacement of the matched points. As camera ... View full abstract»

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  • Toward image-based scene representation using view morphing

    Publication Year: 1996, Page(s):84 - 89 vol.1
    Cited by:  Papers (20)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (655 KB)

    The question of which views map be inferred from a set of basis images is addressed. Under certain conditions, a discrete set of images implicitly describes scene appearance for a continuous range of viewpoints. In particular it is demonstrated that two basis views of a static scene determine the set of all views an the line between their optical centers. Additional basis views further extend the ... View full abstract»

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  • Mixing synthesis and video images of outdoor environments: application to the bridges of Paris

    Publication Year: 1996, Page(s):90 - 94 vol.1
    Cited by:  Papers (5)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    Augmented reality is the technique by which real images can be enhanced by addition of computer-generated information. Augmented reality shows great promises in fields where a simulation in situ would be either impossible, not realistic enough or too expensive. We present in this paper an augmented reality loop that uses vision tools (perspective inversion, tracking) and show how it was used to fu... View full abstract»

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  • Recovery of 3-D closed surfaces using progressive shell models

    Publication Year: 1996, Page(s):95 - 99 vol.1
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (501 KB)

    This paper is concerned with the problems of reconstructing a closed surface from scattered, noisy 3-D data. A progressive shell model is a 3-D extension of the 2-D progressive contour model. We employ finite element methods (FEMs) to reduce the number of the required variables and improve the efficiency in storage and computation. The fundamental forms in differential geometry are used to measure... View full abstract»

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  • Reconstructing free-form surfaces from sparse data

    Publication Year: 1996, Page(s):100 - 104 vol.1
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (684 KB)

    We propose a scheme to recover general free-form surfaces from sparse data, and the data may contain unknown discontinuities. We use a global voting method to infer from sparse data three dense potential fields for surfaces, edges, and junctions. We then use a new model called "winged B-snakes", which are deformable triangular B-spline surfaces embedded with active curves, to fit the surfaces and ... View full abstract»

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  • A shape distance by complete and stable invariant descriptors for contour tracking

    Publication Year: 1996, Page(s):105 - 109 vol.1
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    We consider the problem of comparing geometric objects in order to determine the extent to which one object resembles another. Invariant feature families are presented. A complete and stable set of invariant features has been applied to define all invariant distance in the shapes space. This distance allows us to detect and follow moving objects in a dynamic scene. In order to evaluate the perform... View full abstract»

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  • Topological investigations of object models

    Publication Year: 1996, Page(s):110 - 114 vol.1
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (523 KB)

    The purpose of this paper is the development of a theoretical basis for the investigation of a 3D model's topological structure which is currently a more or less neglected aspect in the areas of object reconstruction and vision. The knowledge of this structure gives rise to detailed statements on the correspondence between a real world object and a digital model which cannot be made using other me... View full abstract»

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  • Analysis and synthesis of the sounds of impact based on shape-invariant properties of materials

    Publication Year: 1996, Page(s):115 - 119 vol.1
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (559 KB)

    We present a model relating materials to the sounds they make when struck. The model exploits a shape-invariant property of materials: the angle of internal friction. We demonstrate the utility of this model in both analyzing and synthesizing sounds generated by impulsive excitation. For the analysis of impact sounds, we present an active approach for discriminating different materials by impulsiv... View full abstract»

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  • A landmark-based approach of shape dissimilarity

    Publication Year: 1996, Page(s):120 - 124 vol.1
    Cited by:  Papers (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    A general contour-oriented shape dissimilarity measure is shown to give unreliable answers due to the arc-length parametrization. Local differences in curve-length due to biological variation cause mismatches in the contour-representations. In many applications all objects to be compared have a basic model in common, which can often be found by the use of landmarks. In the application shown here, ... View full abstract»

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  • Adaptive finite-element meshes for progressive contour models

    Publication Year: 1996, Page(s):125 - 129 vol.1
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (500 KB)

    This paper presents a progressive contour model based on the idea of deforming a contour from an initial shape as a source of prior knowledge by minimizing a defined contour energy to extract a desired contour from an image. The internal component of the contour energy imposes smoothness constraints on the displacements of deformations and the external component establishes the correspondence betw... View full abstract»

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