Proceedings 1992 IEEE Computer Society Conference on Computer Vision and Pattern Recognition

15-18 June 1992

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Displaying Results 1 - 25 of 160
  • Indexing function-based categories for generic recognition

    Publication Year: 1992, Page(s):795 - 797
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The authors report the implementation and evaluation of a function-based recognition system that takes an uninterrupted 3-D object shape as its input and reasons to determine if the object belongs to the superordinate category furniture, and if so, into which (sub)category it falls. The system has analyzed over 250 input objects, and the results largely agree with intuitive human interpretation of... View full abstract»

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  • Proceedings. 1992 IEEE Computer Society Conference on Computer Vision and Pattern Recognition (Cat. No.92CH3168-2)

    Publication Year: 1992
    Request permission for commercial reuse | PDF file iconPDF (20 KB)
    Freely Available from IEEE
  • The scale space aspect graph

    Publication Year: 1992, Page(s):335 - 340
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Currently the aspect graph is computed under the assumption of perfect resolution in the viewpoint, the projected image, and the object shape. Visual detail is represented that an observer might never see in practice. By introducing scale into this framework, a mechanism is provided for selecting levels of detail that are large enough to merit explicit representation, effectively allowing control ... View full abstract»

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  • Saliencies and symmetries: toward 3D object recognition from large model databases

    Publication Year: 1992, Page(s):322 - 327
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (509 KB)

    The construction of interpretation tables from database models is introduced, and a recognition procedure using scene feature groups is discussed. Techniques for extraction of feature group equivalence classes and computation of feature group saliency are discussed. Two methods to reduce the computational burdens associated with a large model database are proposed and tested on polyhedral objects.... View full abstract»

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  • Accurate calibration of CCD-cameras

    Publication Year: 1992, Page(s):96 - 101
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (680 KB)

    A basic review of the bundle adjustment with self-calibration is given. The mathematical model, parameter estimation, and quality analysis of calibration and positioning are covered. The calibration procedure, hardware, and testfield of an accuracy investigation with off-the-shelf CCD (charge-coupled device) camera, lens, and frame grabber are described. A relative accuracy in object space of 1 pa... View full abstract»

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  • Parametrizing and fitting bounded algebraic curves and surfaces

    Publication Year: 1992, Page(s):103 - 108
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    An approach to fitting of implicit algebraic curves and surfaces to point data is introduced. Two families of polynomials with bounded zero sets are presented. Members of these families have the same number of degrees of freedom as general polynomials of the same degree. Methods for fitting members of these families of polynomials to measured data points are described. Experimental results for set... View full abstract»

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  • Efficient model library access by projectively invariant indexing functions

    Publication Year: 1992, Page(s):109 - 114
    Cited by:  Papers (13)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (740 KB)

    Projectively invariant shape descriptors allow fast indexing into model libraries without the need for pose computation or camera calibration. Progress in building a model-based vision system for plane objects that uses algebraic projective invariants is described. A brief account of these descriptors is given, and the recognition system is described, giving examples of the invariant techniques wo... View full abstract»

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  • Adaptive-size physically-based models for nonrigid motion analysis

    Publication Year: 1992, Page(s):833 - 835
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    Adaptive-size physically based models suitable for nonrigid motion analysis are presented. The mesh size increases or decreases dynamically during the surface reconstruction process to locate nodes near surface areas of interests (like high curvature points) and to optimize the fitting error. A priori information about nonrigidity can be included so that the surface model deforms to fit moving dat... View full abstract»

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  • Recovery of hierarchical part structure of 3-D shape from range image

    Publication Year: 1992, Page(s):699 - 702
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    A formulation of the part decomposition problem motived by the minimum-description-length (MDL) criteria is presented. Unlike previous MDL approaches which use analytic functions, a general geometric constraint, convexity, is used as a part constraint. Therefore, the method is suitable for complex natural shapes such as human faces. The recovery process consists of a bottom-up grouping process and... View full abstract»

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  • Properties of energy edge detectors

    Publication Year: 1992, Page(s):586 - 591
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    The author introduces a framework for investigating the properties of energy edge detectors and uses it to derive some results of interest. He shows a necessary condition on the form of constituent linear filters in quadratic detectors, subject to some conditions, and demonstrates some limitations of such detectors. It is shown that no quadratic detector can detect an edge at 0 for both a sinewave... View full abstract»

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  • Correcting chromatic aberrations using image warping

    Publication Year: 1992, Page(s):684 - 687
    Cited by:  Papers (12)  |  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    The use of image warping to reduce the impact of chromatic aberration in vision applications is addressed. The warp is determined using edge displacements which are fit with cubic splines. An image reconstruction algorithm is used for nonlinear resampling. The main contribution of this work is to analyze the quality of the warping approach by comparing it with active lens control. Test results for... View full abstract»

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  • Noise resistant projective and affine invariants

    Publication Year: 1992, Page(s):115 - 121
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB)

    A method of obtaining local projective and affine invariants that is more robust than existing methods is presented. These shape descriptors are useful for object recognition because they eliminate the search for the unknown viewpoint. Being local, these invariants are much less sensitive to occlusion than the global ones used elsewhere. The basic ideas are (i) using an implicit curve representati... View full abstract»

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  • Non-rigid heart wall motion using MR tagging

    Publication Year: 1992, Page(s):399 - 404
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    A measure of deformation energy suitable for fitting deformable models to image data is described. An object's displacement is constrained to be globally smooth by penalizing the variation of the deformation gradient tensor. This homogeneous deformation measure is invariant to arbitrary rigid body motion of object and viewpoint, given the correspondence between model and data. It remains quadratic... View full abstract»

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  • Detecting parameterized curve segments using MDL and the Hough transform

    Publication Year: 1992, Page(s):547 - 552
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    A method for detecting curve segments in a digital image is described. The method takes as input a set of edges, and produces as output the number of and parameters for the segments. The method is robust, requiring no thresholds. In place of thresholds, a model class must be provided. Using the information-theoretic minimum description length (MDL) principle, it evaluates each model in the model c... View full abstract»

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  • Refinement of noisy correspondence using feedback from 3D motion

    Publication Year: 1992, Page(s):836 - 838
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    In automated feature-based motion analysis of multiple frames, correspondence data are usually noisy and fragmented. A technique that gradually refines the initial noisy correspondence data and links fragments of a single trajectory using feedback from 3D motion estimation is presented. First, 3D motion parameters are estimated using the initial correspondence data. Then, each noisy trajectory is ... View full abstract»

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  • Hierarchical waveform matching: a new feature-based stereo technique

    Publication Year: 1992, Page(s):513 - 519
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (864 KB)

    A feature-based stereo matching system that is based on an algorithm for one-dimensional waveform matching is described. It is intended for use in automated cartography, to generate an accurate three-dimensional model of man-made structures and natural terrain. Each epipolar line in the stereo pair is represented as a one-dimensional intensity waveform. The waveform is described as a collection of... View full abstract»

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  • A measure of symmetry based on shape similarity

    Publication Year: 1992, Page(s):703 - 706
    Cited by:  Papers (10)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (280 KB)

    The authors view symmetry as a continuous feature, and define a continuous symmetry measure (CSM) of shapes. The general definition of symmetry measure allows a comparison of the amount of symmetry of different shapes and the amount of different symmetries of a single shape. Furthermore, the CSM is associated with the symmetric shape that is closest to the given one, enabling visual evaluation of ... View full abstract»

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  • Vision-based range estimation using helicopter flight data

    Publication Year: 1992, Page(s):202 - 208
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (816 KB)

    Computer-vision-based methods provide one general approach for obstacle detection and range estimation for pilot assistance during low-altitude flight. Results obtained using helicopter flight data with a feature-based range estimation algorithm are presented. A method for recursively estimating range using a Kalman filter with a monocular sequence of images and knowledge of the camera's motion is... View full abstract»

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  • Deformable models for 3-D medical images using finite elements and balloons

    Publication Year: 1992, Page(s):592 - 598
    Cited by:  Papers (26)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    A 3-D generalization of the balloon model as a 3-D deformable surface, which evolves in 3-D images, is presented. It is deformed under the action of internal and external forces attracting the surface toward detected edge elements by means of an attraction potential. To solve the minimization problem for a surface, two simplified approaches are shown, defining a 3-D surface as a series of 2-D plan... View full abstract»

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  • Object segmentation and binding within a biologically-based neural network model of depth-from-occlusion

    Publication Year: 1992, Page(s):688 - 691
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    The problems of object segmentation and binding are addressed within a biologically based network model capable of determining depth from occlusion. In particular, the authors discuss two subprocesses most relevant to segmentation and binding: contour binding and figure direction. They propose that these two subprocesses have intrinsic constraints that allow several underdetermined problems in occ... View full abstract»

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  • Recognizing human action in time-sequential images using hidden Markov model

    Publication Year: 1992, Page(s):379 - 385
    Cited by:  Papers (465)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    A human action recognition method based on a hidden Markov model (HMM) is proposed. It is a feature-based bottom-up approach that is characterized by its learning capability and time-scale invariability. To apply HMMs, one set of time-sequential images is transformed into an image feature vector sequence, and the sequence is converted into a symbol sequence by vector quantization. In learning huma... View full abstract»

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  • Some invariant linear methods in photogrammetry and model-matching

    Publication Year: 1992, Page(s):122 - 128
    Cited by:  Papers (7)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    For several useful tasks in photogrammetry and in model-based vision, noniterative methods that require only the inversion of systems of linear equations are developed. The methods are based on the theory of projective invariants. The tasks addressed are resection, intersection, and transfer, or model matching (with or without ground control points). The following kinds of transfer are examined: (... View full abstract»

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  • On Poisson solvers and semi-direct methods for computing area based optical flow

    Publication Year: 1992, Page(s):857 - 860
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    T. Simchony et al. (1990) proposed a semidirect method for computing area-based optical flow, based on the iterative application of a direct Poisson solver. This method is restricted to Dirichlet boundary conditions, i.e. it is applicable only when velocity vectors at the boundary of the domain are known a priori. It is shown, both experimentally and through analysis, that the semidirect method co... View full abstract»

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  • The image understanding environment program

    Publication Year: 1992, Page(s):406 - 416
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    The history of the image understanding environment (IUE) project, a five-year program to develop a common software environment for the development of algorithms and application systems, is reviewed. An overview of some of the data structures that are currently evolving as a specification for the IUE is provided. The ultimate goal of the project is to provide the basic data structures and algorithm... View full abstract»

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  • A simple algorithm for shape from shading

    Publication Year: 1992, Page(s):459 - 465
    Cited by:  Papers (69)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (644 KB)

    A shape-from-shading algorithm that recovers depth from a brightness image typically in fewer than ten iterations, is described. This algorithm, which is a simplification of the algorithm of J. Oliensis and P. Dupuis (1991), is based on a minimum downhill principle that guarantees continuous surfaces and stable results. The algorithm is applicable to a broad variety of objects and reflectance maps View full abstract»

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