IEEE Transactions on Pattern Analysis and Machine Intelligence

Issue 8 • Aug. 1994

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Displaying Results 1 - 15 of 15
  • 3-D object recognition with symmetric models: symmetry extraction and encoding

    Publication Year: 1994, Page(s):814 - 818
    Cited by:  Papers (7)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (535 KB)

    Object recognition systems which employ solid models and range data have been a topic of interest for several years. Model databases have the potential to become large in some environments. This paper proposes a pair of techniques for incorporating knowledge of the symmetries of object models into the recognition process. The effects of symmetric models on the speed of an object recognition system... View full abstract»

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  • Comments on "Comparative analysis of backpropagation and the extended Kalman filter for training multilayer perceptrons"

    Publication Year: 1994, Page(s):862 - 863
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    In this note, the connection between the backpropagation algorithm and the extended Kalman filter is analyzed using an alternate form of representation for the Kalman gain term and shown to be much simpler than that reported by Ruck et al (1992).<> View full abstract»

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  • Gibbs random field model based weight selection for the 2-D adaptive weighted median filter

    Publication Year: 1994, Page(s):831 - 837
    Cited by:  Papers (5)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    A generalized filtering method based on the minimization of the energy of the Gibbs model is described. The well-known linear and median filters are all special cases of this method. It is shown that, with that selection of appropriate energy functions, the method can be successfully used to adapt the weights of the adaptive weighted median filter to preserve different textures within the image wh... View full abstract»

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  • Shape from focus

    Publication Year: 1994, Page(s):824 - 831
    Cited by:  Papers (478)  |  Patents (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (756 KB)

    The shape from focus method presented here uses different focus levels to obtain a sequence of object images. The sum-modified-Laplacian (SML) operator is developed to provide local measures of the quality of image focus. The operator is applied to the image sequence to determine a set of focus measures at each image point. A depth estimation algorithm interpolates a small number of focus measure ... View full abstract»

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  • Keyword spotting in poorly printed documents using pseudo 2-D hidden Markov models

    Publication Year: 1994, Page(s):842 - 848
    Cited by:  Papers (121)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    An algorithm for robust machine recognition of keywords embedded in a poorly printed document is presented. For each keyword, two statistical models, called pseudo 2-D hidden Markov models, are created for representing the actual keyword and all the other extraneous words, respectively. Dynamic programming is then used for matching an unknown input word with the two models and for making a maximum... View full abstract»

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  • Robust 3-D-3-D pose estimation

    Publication Year: 1994, Page(s):818 - 824
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    The correspondence focuses on the robust 3-D-3-D pose estimation, especially, multiple pose estimation. The robust 3-D-3-D multiple pose estimation problem is formulated as a series of general regressions which involve a successively size-decreasing data set, with each regression relating to one particular pose of interest. Since the first few regressions may carry a severely contaminated Gaussian... View full abstract»

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  • On the discriminatory power of adaptive feed-forward layered networks

    Publication Year: 1994, Page(s):837 - 842
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    This correspondence expands the available theoretical framework that establishes a link between discriminant analysis and adaptive feed-forward layered linear-output networks used as mean-square classifiers. This has the advantages of providing more theoretical justification for the use of these nets in pattern classification and gaining a better insight into their behavior and about their use. Th... View full abstract»

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  • Detection of dimension sets in engineering drawings

    Publication Year: 1994, Page(s):848 - 855
    Cited by:  Papers (15)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (628 KB)

    This correspondence presents a system for detecting dimension sets in engineering drawings that are drawn to ANSI drafting standards. A new rule-based text/graphics separation algorithm and a model-based procedure for detecting arrowheads in any orientation have been developed. Arrowhead tracking and search methods are used to extract leaders, tails, and witness lines from segmented images contain... View full abstract»

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  • Isoperimetric normalization of planar curves

    Publication Year: 1994, Page(s):769 - 777
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (636 KB)

    This paper presents an algorithm for transforming closed planar curves into a canonical form, independent of the viewpoint from which the original image of the contour was taken. The transformation that takes the contour to its canonical form is a member of the projective group PGL(2), chosen because PGL(2) contains all possible transformations of a plane curve under central projection onto anothe... View full abstract»

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  • Detection and separation of ring-shaped clusters using fuzzy clustering

    Publication Year: 1994, Page(s):855 - 861
    Cited by:  Papers (69)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    A new fuzzy clustering algorithm, designed to detect and characterize ring-shaped clusters and combinations of ring-shaped and compact spherical clusters, has been developed. This FKR algorithm includes automatic search for proper initial conditions in the two cases of concentric and excentric (intersected) combinations of clusters. Validity criteria based on total fuzzy area and fuzzy density are... View full abstract»

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  • Projective structure from uncalibrated images: structure from motion and recognition

    Publication Year: 1994, Page(s):778 - 790
    Cited by:  Papers (52)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1180 KB)

    Address the problem of reconstructing 3-D space in a projective framework from two or more views, and the problem of artificially generating novel views of the scene from two given views (reprojection). The author describes an invariance relation that provides a new description of structure, which the author calls projective depth, that is captured by a single equation relating image point corresp... View full abstract»

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  • Subμm registration of fiducial marks using machine vision

    Publication Year: 1994, Page(s):791 - 794
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (460 KB)

    Subμm registration between circularly symmetric fiducial marks can be achieved simply by finding their centroids by fitting circles to distributed edge positions determined by the second-derivative zero-crossing method. However, because of diffraction fringes, substantial errors originating in the tilt of the microscope optical axis must be minimized. This method is used for laser-fibre alignme... View full abstract»

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  • Toward object-based heuristics

    Publication Year: 1994, Page(s):794 - 802
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (728 KB)

    Recovering the 3-D shape of an object from its 2-D image contour is an important problem in computer vision. In this correspondence, the author motivates and develops two object-based heuristics. The structured nature of objects is the motivation for the nonaccidental alignment criterion: parallel coordinate axes within the object's bounding contour correspond to object-centered coordinate axes. T... View full abstract»

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  • 3-D pose from 3 points using weak-perspective

    Publication Year: 1994, Page(s):802 - 808
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    This correspondence discusses computing the pose of a model from three matching point pairs under weak-perspective projection. A new approach to the problem that is motivated geometrically is described. Like previous methods, the method here involves solving a biquadratic equation, but here the biquadratic's solutions, comprised of an actual and a false solution, are interpreted graphically. The f... View full abstract»

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  • Using simple decomposition for smoothing and feature point detection of noisy digital curves

    Publication Year: 1994, Page(s):808 - 813
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (532 KB)

    This correspondence presents an algorithm for smoothed polygonal approximation of noisy digital planar curves, and feature point detection. The resulting smoothed polygonal representation preserves the signs of the curvature function of the curve. The algorithm is based on a simple decomposition of noisy digital curves into a minimal number of convex and concave sections. The location of each sepa... View full abstract»

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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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Editor-in-Chief
Sven Dickinson
University of Toronto
e-mail: sven@cs.toronto.edu