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IEEE Transactions on Pattern Analysis and Machine Intelligence

Issue 8 • Date Aug 1991

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Displaying Results 1 - 13 of 13
  • Gray level thresholding in badly illuminated images

    Publication Year: 1991, Page(s):813 - 819
    Cited by:  Papers (97)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (976 KB)

    The thresholding method involves first locating objects in an image by using the intensity gradient, then noting the levels that correspond to the objects in various areas of the image, and finally using these levels as initial guesses at a threshold. This method is capable of thresholding images that have been produced in the context of variable illumination. The thresholding method, called the l... View full abstract»

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  • 3-D position sensing using a passive monocular vision system

    Publication Year: 1991, Page(s):809 - 813
    Cited by:  Papers (12)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    Passive monocular 3-D position sensing is made possible by a new calibration scheme that relates depth to focus blur through a composite lens and aperture model. The calibration technique enables the recovery of absolute 3-D position coordinates from image coordinates and measured focus blur. A geometric model of the camera's position and orientation in space is used to transform the camera's imag... View full abstract»

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  • Automated inspection of textile fabrics using textural models

    Publication Year: 1991, Page(s):803 - 808
    Cited by:  Papers (120)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (776 KB)

    The authors discuss the problem of textile fabric inspection using the visual textural properties of the fabric. The problem is to detect and locate the various kinds of defects that might be present in a given fabric sample based on an image of the fabric. Stochastic models are used to model the visual fabric texture. The authors use the Gaussian Markov random field to model the texture image of ... View full abstract»

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  • A simulation-based estimator for hidden Markov random fields

    Publication Year: 1991, Page(s):825 - 830
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    An estimator for estimating the parameters of a Markov random field X from inaccurate observations is introduced. The author considers first a Markov (Gibbs) random field X={Xi,j} on a lattice L={(i ,j): i=1,2,. . .,n; j=1,2,. . .,m}. The marginal distributions of (Xi,j, ... View full abstract»

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  • Direct recovery of three-dimensional scene geometry from binocular stereo disparity

    Publication Year: 1991, Page(s):761 - 774
    Cited by:  Papers (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1480 KB)

    An analysis of disparity is presented. It makes explicit the geometric relations between a stereo disparity field and a differentially project scene. These results show how it is possible to recover three-dimensional surface geometry through first-order (i.e., distance and orientation of a surface relative to an observer) and binocular viewing parameters in a direct fashion from stereo disparity. ... View full abstract»

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  • Robust clustering with applications in computer vision

    Publication Year: 1991, Page(s):791 - 802
    Cited by:  Papers (150)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1428 KB)

    A clustering algorithm based on the minimum volume ellipsoid (MVE) robust estimator is proposed. The MVE estimator identifies the least volume region containing h percent of the data points. The clustering algorithm iteratively partitions the space into clusters without prior information about their number. At each iteration, the MVE estimator is applied several times with values of ... View full abstract»

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  • A validity measure for fuzzy clustering

    Publication Year: 1991, Page(s):841 - 847
    Cited by:  Papers (1284)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (660 KB)

    The authors present a fuzzy validity criterion based on a validity function which identifies compact and separate fuzzy c-partitions without assumptions as to the number of substructures inherent in the data. This function depends on the data set, geometric distance measure, distance between cluster centroids and more importantly on the fuzzy partition generated by any fuzzy algorithm used. The fu... View full abstract»

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  • Generating connected textured fractal patterns using Markov random fields

    Publication Year: 1991, Page(s):819 - 825
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    An algorithm that yields textured and connected binary fractals is presented. The texture is imposed by modelling the fractal as a Markov random field (MRF) at every resolution level. The model size and the parameters specify the texture. The generation starts at a coarser level and continues at finer levels. Connectivity, which is a global property, is maintained by restricting the flow of the sa... View full abstract»

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  • The revised fundamental theorem of moment invariants

    Publication Year: 1991, Page(s):830 - 834
    Cited by:  Papers (125)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    A revised fundamental theorem of moment invariants for pattern recognition which corrects the fundamental theorem proposed by M.K. Hu (1962), is presented. The correction affects neither similitude (scale) nor rotation invariants derived using the original theorem, but it does affect features invariant to general linear transformations. Four of the latter invariants were presented originally by Hu... View full abstract»

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  • A contour-based recovery of image flow: Iterative transformation method

    Publication Year: 1991, Page(s):746 - 760
    Cited by:  Papers (9)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1348 KB)

    The authors present an iterative algorithm for the recovery of 2-D motion, i.e., for the determination of a transformation that maps one image onto another. The local ambiguity in measuring the motion of contour segments (the aperture problem) implies a reliance on measurements along the normal direction. Since the measured normal flow does not agree with the actual normal flow, the full flow reco... View full abstract»

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  • Multidimensional orientation estimation with applications to texture analysis and optical flow

    Publication Year: 1991, Page(s):775 - 790
    Cited by:  Papers (237)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1708 KB)

    The problem of detection of orientation in finite dimensional Euclidean spaces is solved in the least squares sense. The theory is developed for the case when such orientation computations are necessary at all local neighborhoods of the n-dimensional Euclidean space. Detection of orientation is shown to correspond to fitting an axis or a plane to the Fourier transform of an n-dim... View full abstract»

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  • A new parameterization of digital straight lines

    Publication Year: 1991, Page(s):847 - 852
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    A 1:1 correspondence is established between digital straight lines which start at a fixed point and a simple set of quadruples of integer parameters. Such a representation by parameters is useful for enumeration, First, the authors show a 1:1 correspondence between point pairs in a planar set of points and the linear dichotomies of this set. Then, from the equivalence between digital lines and lin... View full abstract»

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  • A statistical-heuristic feature selection criterion for decision tree induction

    Publication Year: 1991, Page(s):834 - 841
    Cited by:  Papers (9)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    The authors present a statistical-heuristic feature selection criterion for constructing multibranching decision trees in noisy real-world domains. Real world problems often have multivalued features. To these problems, multibranching decision trees provide a more efficient and more comprehensible solution that binary decision trees. The authors propose a statistical-heuristic criterion, the symme... View full abstract»

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Aims & Scope

The IEEE Transactions on Pattern Analysis and Machine Intelligence (TPAMI) is published monthly. Its editorial board strives to present most important research results in areas within TPAMI's scope.

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Meet Our Editors

Editor-in-Chief
David A. Forsyth
University of Illinois
e-mail: daf@illinois.edu