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Automated CAD-Based Vision, 1991., Workshop on Directions in

Date 2-3 June 1991

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Displaying Results 1 - 20 of 20
  • 3D object recognition using invariant feature indexing of interpretation tables

    Publication Year: 1991, Page(s):115 - 123
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (621 KB)

    The authors propose a technique for 3D object recognition from range data; the technique collects partial interpretations from precompiled tables indexed by invariant features of pairs of surface patches. This technique was motivated by some recent work in so-called geometric hashing procedures. A technique for automated construction of invariant feature indexed interpretation tables from CAD mode... View full abstract»

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  • Workshop on Directions in Automated CAD-Based Vision. (Cat. No.91TH0377-2)

    Publication Year: 1991
    Request permission for commercial reuse | PDF file iconPDF (17 KB)
    Freely Available from IEEE
  • Computing stable poses of piecewise smooth objects

    Publication Year: 1991, Page(s):66 - 75
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (708 KB)

    When a three dimensional object is known to be lying on a planar surface, its pose is restricted from six to three degrees of freedom. Computer vision algorithms can exploit the few stable poses of modelled objects to simplify scene interpretation and more accurately determine object location. The paper presents necessary and sufficient conditions for the pose of a piecewise smooth curved three di... View full abstract»

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  • Implementation of geometric hashing on the Connection Machine

    Publication Year: 1991, Page(s):76 - 84
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (656 KB)

    The authors report on a scalable implementation of geometric hashing on the Connection Machine. Using this implementation, it is possible to recognize models consisting of patterns of points embedded in scenes, independent of translation, rotation, and scale changes. With 1024 models and a scene of 200 points, the implementation yields an execution time of 70 milliseconds for recognition of the on... View full abstract»

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  • INGEN: a robot vision system for generic object recognition

    Publication Year: 1991, Page(s):166 - 175
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (900 KB)

    Generic shape recognition is the problem of determining the pose and dimensions of objects for which only shape models are available and the object's size is unknown. One application domain for generic object recognition is the handling and sorting of postal objects. Because metrical information relating object features to one another is not available, the more common feature-based approaches are ... View full abstract»

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  • Automatic camera and light-source placement using CAD models

    Publication Year: 1991, Page(s):22 - 32
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (928 KB)

    The paper describes model-based methods to determine the region where a camera and light source should be placed. It presents new techniques that determine the region of light placements that guarantee specified object edges will be detected. These methods use geometric models of the objects and the characteristics of the camera, lens, digitiser, and edge detector to determine the region of accept... View full abstract»

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  • Context-constrained matching of hierarchical CAD-based models for outdoor scene interpretation

    Publication Year: 1991, Page(s):186 - 195
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1696 KB)

    The authors propose a method for outdoor scene interpretation which recognizes many kinds of objects in the scene, and determines their geometric structures using context information of objects in the scene and flexible matching of hierarchical CAD-based models. The system can deal with outdoor scenes with artificial objects which may have various shapes and sizes, and natural objects for which th... View full abstract»

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  • On using CAD models to compute the pose of curved 3D objects

    Publication Year: 1991, Page(s):136 - 145
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (860 KB)

    A new approach is presented for explicitly relating image observables to models of curved three-dimensional objects. This relationship is used for object recognition and positioning. Object models consist of collections of parametric surface patches. The image observables considered are raw range data, surface normals and Gaussian curvature, raw image contours, contour orientation and curvature, r... View full abstract»

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  • Perspective projection aspect graphs of solids of revolution: an implementation

    Publication Year: 1991, Page(s):44 - 53
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (764 KB)

    Over the past few years, a number of researchers have presented algorithms for computing the aspect graph representation for both polyhedra and curved-surface objects. Viewpoint space models have included the viewing sphere (orthographic projection) and all of 3-D space (perspective projection). The paper presents the first (only) complete implementation of an algorithm to compute the exact aspect... View full abstract»

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  • CAD-based feature-utility measures for automatic vision programming

    Publication Year: 1991, Page(s):106 - 114
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (916 KB)

    Three feature-utility measures-detectability, reliability, and error rate-are defined and related to the execution time of a vision program. Using a realistic vision task as a scenario, the authors show how the utility measures can be used to automatically generate the most efficient vision programs. They also present the experimental result of estimating the feature-utility measures using synthet... View full abstract»

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  • PREMIO: an overview [object recognition]

    Publication Year: 1991, Page(s):11 - 21
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1896 KB)

    A model-based vision system attempts to find a correspondence between features of an object model and features detected in an image. Most feature-based matching schemes assume that all the features that are potentially visible in a view of all object will appear with equal probability. The resultant matching algorithms have to allow for `errors' without really understanding what they mean. PREMIO ... View full abstract»

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  • A generic bridge finder [object recognition]

    Publication Year: 1991, Page(s):176 - 185
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1060 KB)

    The authors show that for some objects whose geometry is not precisely known, it is possible to design a robust recognition scheme based on discriminating features through an exhaustive tree-search. They deal with the problem of finding one instantiation of an object in a single image that is the best one according to a predefined quality-score. It is also assumed that the object surely lies withi... View full abstract»

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  • Why aspect graphs are not (yet) practical for computer vision

    Publication Year: 1991, Page(s):97 - 104
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (576 KB)

    The aspect graph of an object is a graph structure in which each node represents a general view of the object as seen from some maximal, connected cell of viewpoint space; each arc represents an accidental view (or visual event) which occurs on the boundary between two cells of general viewpoint; there is a node for each possible general view of the object, and there is an arc for each possible vi... View full abstract»

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  • Automatic generation of recognition strategies using CAD models

    Publication Year: 1991, Page(s):124 - 133
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    A new scheme for generating CAP-based object recognition strategies is introduced. The strategy is used to locate a given CAD model in a scene. Similar to many previous model-based vision systems, the proposed scheme is divided into offline and online stages. In the offline stage, the CAD model is used to compile a tree, referred to as the recognition tree. The CAD model's features are organized i... View full abstract»

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  • On the characteristic views of quadric-surfaced solids

    Publication Year: 1991, Page(s):34 - 43
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (652 KB)

    Given a 3D object (solid), it is possible to subdivide the exterior viewing space of the solid into maximally connected subspaces of vantage points such that the perspective views of the solid from all vantage points within a subspace are isomorphic in terms of their line junction graphs. The authors refer to such subspaces as the characteristic-view domains (CVDs) of the solid, and to a represent... View full abstract»

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  • CBCV: a CAD-based computer vision system

    Publication Year: 1991, Page(s):146 - 154
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (628 KB)

    The CBCV system has been developed in order to provide the capability of automatically synthesizing executable vision modules for various functions like object recognition, pose determination, quality inspection, etc. A wide range of tools exist for both 2D and 3D vision, including not only software capabilities for various vision algorithms, but also a high-level frame-based system for describing... View full abstract»

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  • Model based recognition of specular objects using sensor models

    Publication Year: 1991, Page(s):2 - 10
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (868 KB)

    The authors present a model-based object recognition system for specular objects. Objects with specular surfaces present a problem for computer vision. Simulating object appearances by using the sensor model, and the object model allows us to predict specular features, and to analyze the detectability and reliability of each feature. The system generates a set of aspects of the object. By precompi... View full abstract»

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  • From volumes to views: an approach to 3-D object recognition

    Publication Year: 1991, Page(s):85 - 96
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (952 KB)

    The authors present an approach to the recovery and recognition of 3-D objects from a single 2-D image. Given a recognition domain consisting of a database of objects, they select a set of object-centered 3-D volumetric modeling primitives that can be used to construct the objects. They take the set of primitives and generate a hierarchical aspect representation based on their projected surfaces; ... View full abstract»

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  • CAD based inspection: using a vision cell demonstrator

    Publication Year: 1991, Page(s):155 - 164
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (896 KB)

    The paper addresses issues in developing an automated visual inspection system. To achieve a truly flexible automated visual inspection system, the interface between the vision system and the CAD system is an important factor. Although both vision and CAD systems rely on models of objects, these two fields remain rather disjoint in data representation. An interface which bridges the gap between th... View full abstract»

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  • Constrained viewpoint from occluding contour

    Publication Year: 1991, Page(s):54 - 63
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (880 KB)

    The paper addresses the problem of how to constrain the set of viewpoints from which a 3D model will project to a given a set of occluding contour features. The approach is new in that it relies on a precomputed occluding contour representation for polyhedral models that makes T-junctions, contour terminals and the change in contour topology explicit. Potential model-image correspondences of occlu... View full abstract»

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