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Computer Vision and Pattern Recognition, 1992. Proceedings CVPR '92., 1992 IEEE Computer Society Conference on

Date 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 (6)
    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 (4)
    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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  • 3D model acquisition from monocular image sequences

    Publication Year: 1992, Page(s):209 - 215
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    Automatic building 3D models of objects and scenes from a sequence of 2D monocular images is approached by first building a partial model (possibly noisy) and then extending and refining it. The initial model is built by tracking and reconstructing shallow structures over a sequence of images using the constraint of affine trackability. This model is subsequently used to compute the pose that rela... View full abstract»

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  • An object-oriented approach to template guided visual inspection

    Publication Year: 1992, Page(s):386 - 392
    Cited by:  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    The concepts and design issues that provide the basis for the I 2F (image interpretation foundations) system are described. The I2F system combines object-oriented design for machine vision software and constraint-based geometric modeling into a flexible and effective system for automatic template-guided visual inspection. Object-oriented design for 2-D geometry-based image a... View full abstract»

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  • The image understanding environment program

    Publication Year: 1992, Page(s):406 - 416
    Cited by:  Papers (8)
    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 MRF approach to optical flow estimation

    Publication Year: 1992, Page(s):853 - 856
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    A Markov random field (MRF) formulation for the problem of optical flow computation is studied. An adaptive window matching scheme is used to obtain a good measure of the correlation between the two images. A confidence measure for each match is also used. Thus, the input to the system is the adaptive correlation and the corresponding confidence. The MRF model is then used to estimate the velocity... 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 (4)  |  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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  • Predicting expected gray level statistics of opened signals

    Publication Year: 1992, Page(s):554 - 559
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    The opening of a model signal with a convex, zero-height structuring element is studied empirically. Experiments are performed in which the input signal model parameters and the opening length are varied over an acceptable range and the corresponding grey level distributions in the opened signal are fit to Pearson distributions. Regressions are then used to relate the Pearson distribution paramete... View full abstract»

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  • Absolute orientation from uncertain point data: a unified approach

    Publication Year: 1992, Page(s):77 - 82
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    A general and flexible method for fusing and integrating different 2D and 3D measurements for pose estimation is proposed. The 2D measured data are viewed as 3D data with infinite uncertainty in a particular direction. This representation unifies the two categories of the absolute orientation problem into a single problem that varies only in the uncertainty values associated with the measurements.... View full abstract»

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  • A fast linear shape from shading

    Publication Year: 1992, Page(s):734 - 736
    Cited by:  Papers (10)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB)

    A method for computing depth from a single shaded image is presented. Discrete approximations for p and q using finite differences are used, and the reflectance in Zij is linearized. The method is faster, since each operation is purely local. In addition, it gives good results for spherical surfaces, in contrast to other linear methods View full abstract»

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  • Local reproducible smoothing without shrinkage

    Publication Year: 1992, Page(s):277 - 282
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    A simple local smoothing filter for curves or surfaces, combining the advantages of Gaussian smoothing and Fourier curve description, is defined. Unlike Gaussian filters, the filter described has no shrinkage problem. Repeated application of the filter does not yield a curve or surface smaller than the original, but simply reproduces the approximate result that would have been obtained by a single... View full abstract»

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  • Contour matching using local affine transformations

    Publication Year: 1992, Page(s):798 - 801
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    A noniterative scheme for determining contour matches using locally affine transformations is proposed. The method assumes that contours are approximated by the orthographic projection of planar patches within oriented neighborhoods of varying sizes. For degenerate cases, a minimal matching solution is chosen closest to the minimal pure translation. Performance on noisy synthetic and natural conto... 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 (19)
    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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  • Hierarchical decomposition and axial shape description

    Publication Year: 1992, Page(s):49 - 55
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    The problem of obtaining intuitive descriptions of planar shapes is addressed. In particular, a method for producing a segmented axial description of a given shape together with a hierarchical decomposition of the shape into its parts is suggested. Smooth local symmetries are used for the axial description of parts. Parallel symmetries are used to provide information on global relationships within... View full abstract»

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  • CCD camera calibration and noise estimation

    Publication Year: 1992, Page(s):90 - 95
    Cited by:  Papers (2)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    The variation in digitized pixel values that is due to sensor noise and scene variation is quantified, using physical models for CCD (charge-coupled device) video cameras and material reflectance. This analysis forms the basis of algorithms for camera characterization and calibration and for surface description. The use of these techniques for estimating a measure of scene variation is described. ... View full abstract»

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  • Spatial-quefrency approach to optical echo analysis

    Publication Year: 1992, Page(s):850 - 852
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    A methodology for optical flow analysis based on cepstral filtering is introduced. The power cepstrum is extended to multiframe analysis. A correlative cepstral technique, cepsCorr, is developed. It significantly increases the signal-to-noise ratio, reduces ambiguities, and it provides a predictive or multievidence approach to visual motion analysis 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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  • Active photometric stereo

    Publication Year: 1992, Page(s):29 - 34
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    An active vision technique for determining the absolute depth of surfaces is described. The algorithm assumes a very general model for the reflectance properties of the surface, and is valid for most of the shading models commonly used in computer vision work. The algorithm relies on the controlled motion of a point light source, which is not at infinity but relatively close to the surface and to ... View full abstract»

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  • Robust statistics in shape fitting

    Publication Year: 1992, Page(s):540 - 546
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (572 KB)

    The concept of robustness in statistics is examined. Starting from the concepts of the breakdown point and equivariance properties of an estimator, the desired equivariance properties for shape fitting are defined, and high breakdown point methods with these properties are found View full abstract»

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  • Computing the view orientations of random projections of asymmetric objects

    Publication Year: 1992, Page(s):71 - 76
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    A method for determining the relative view orientation of randomly acquired projections of asymmetric objects is described. It extends the projection slice theorem by determining the relative orientation of projections by the location of lines of intersection among the Fourier transforms of the projections in 3D Fourier space. The complete algorithm is described, and its efficacy is demonstrated u... View full abstract»

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  • Single plane model extension using projective transformations and data fusion

    Publication Year: 1992, Page(s):752 - 754
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    A priori knowledge of the relative positions of four or more coplanar points or lines is used to derive the positions of other points and lines on the same plane in a manner invariant to camera location and intrinsic camera parameters. A framework for data fusion in the projective plane is presented to merge the position estimates of coplanar points and lines derived in this way 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 (336)  |  Patents (8)
    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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  • Multi-primitive hierarchical (MPH) stereo system

    Publication Year: 1992, Page(s):499 - 505
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    A computational framework for an accurate, robust, and efficient stereo approach is developed. Most of the deficiencies prevailing in current computational models of stereo can be attributed to their use of a single, typically edge-element-based, primitive for stereo analysis and to their use of a single-level control strategy. The multi-primitive hierarchical (MPH) framework for stereo analysis p... View full abstract»

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