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IEEE Transactions on Pattern Analysis and Machine Intelligence

Issue 10 • Date Oct 1997

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Displaying Results 1 - 14 of 14
  • Shape spectrum based view grouping and matching of 3D free-form objects

    Publication Year: 1997, Page(s):1139 - 1145
    Cited by:  Papers (57)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    We address the problem of constructing view aspects of 3D free-form objects for efficient matching during recognition. We introduce a novel view representation based on “shape spectrum” features, and propose a general and powerful technique for organizing multiple views of objects of complex shape and geometry into compact and homogeneous clusters. Our view grouping technique obviates ... View full abstract»

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  • Optimal registration of object views using range data

    Publication Year: 1997, Page(s):1131 - 1138
    Cited by:  Papers (42)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    This paper deals with robust registration of object views in the presence of uncertainties and noise in depth data. Errors in registration of multiple views of a 3D object severely affect view integration during automatic construction of object models. We derive a minimum variance estimator (MVE) for computing the view transformation parameters accurately from range data of two views of a 3D objec... View full abstract»

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  • Recovering 3D motion of multiple objects using adaptive Hough transform

    Publication Year: 1997, Page(s):1178 - 1183
    Cited by:  Papers (23)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3472 KB)

    We present a method to determine 3D motion and structure of multiple objects from two perspective views, using adaptive Hough transform. In our method, segmentation is determined based on a 3D rigidity constraint. Instead of searching candidate solutions over the entire five-dimensional translation and rotation parameter space, we only examine the two-dimensional translation space. We divide the i... View full abstract»

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  • Correcting the geometry and color of digital images

    Publication Year: 1997, Page(s):1152 - 1158
    Cited by:  Papers (10)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    A unified method for correcting the geometry and color of digital images is presented. The method uses a color chart with a prearranged array of known color patches. Using the true geometry and color of the chart and geometry and color of the image of the chart, transformation functions that describe the geometry and color characteristics of the camera are determined. The transformation functions ... View full abstract»

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  • COSMOS-A representation scheme for 3D free-form objects

    Publication Year: 1997, Page(s):1115 - 1130
    Cited by:  Papers (227)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    We address the problem of representing and recognizing 3D free-form objects when (1) the object viewpoint is arbitrary, (2) the objects may vary in shape and complexity, and (3) no restrictive assumptions are made about the types of surfaces on the object. We assume that a range image of a scene is available, containing a view of a rigid 3D object without occlusion. We propose a new and general su... View full abstract»

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  • Classification using adaptive wavelets for feature extraction

    Publication Year: 1997, Page(s):1058 - 1066
    Cited by:  Papers (62)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    A major concern arising from the classification of spectral data is that the number of variables or dimensionality often exceeds the number of available spectra. This leads to a substantial deterioration in performance of traditionally favoured classifiers. It becomes necessary to decrease the number of variables to a manageable size, whilst, at the same time, retaining as much discriminatory info... View full abstract»

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  • A smoothly constrained Kalman filter

    Publication Year: 1997, Page(s):1171 - 1177
    Cited by:  Papers (62)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    This paper presents the Smoothly Constrained Kalman Filter (SCKF) for nonlinear constraints. A constraint is any relation that exists between the state variables. Constraints can be treated as perfect observations. But, linearization errors can prevent the estimate from converging to the true value. Therefore, the SCKF iteratively applies nonlinear constraints as nearly perfect observations, or, e... View full abstract»

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  • “Brownian strings”: Segmenting images with stochastically deformable contours

    Publication Year: 1997, Page(s):1100 - 1114
    Cited by:  Papers (49)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (524 KB)

    This paper describes an image segmentation technique in which an arbitrarily shaped contour was deformed stochastically until it fitted around an object of interest. The evolution of the contour was controlled by a simulated annealing process which caused the contour to settle into the global minimum of an image-derived “energy” function. The nonparametric energy function was derived f... View full abstract»

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  • A variational approach to recovering depth from defocused images

    Publication Year: 1997, Page(s):1158 - 1164
    Cited by:  Papers (32)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1456 KB)

    In this paper, we propose a regularized solution to the depth from defocus (DFD) problem using the space-frequency representation (SFR) framework. A smoothness constraint is imposed on the estimates of the blur parameter, and a variational approach to the DFD problem is developed. Among the numerous SFRs, we study the applicability of the complex spectrogram and the Wigner distribution, in particu... View full abstract»

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  • Large-scale simulation studies in image pattern recognition

    Publication Year: 1997, Page(s):1067 - 1079
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    Many obstacles to progress in image pattern recognition result from the fact that per-class distributions are often too irregular to be well-approximated by simple analytical functions. Simulation studies offer one way to circumvent these obstacles. We present three closely related studies of machine-printed character recognition that rely on synthetic data generated pseudo-randomly in accordance ... View full abstract»

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  • The illumination-invariant matching of deterministic local structure in color images

    Publication Year: 1997, Page(s):1146 - 1151
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1336 KB)

    The availability of multiple spectral measurements at each pixel in an image provides important additional information for recognition. Spectral information is of particular importance for applications where spatial information is limited. Such applications include the recognition of small objects or the recognition of small features on partially occluded objects. We introduce a feature matrix rep... View full abstract»

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  • Space-variant Fourier analysis: the exponential chirp transform

    Publication Year: 1997, Page(s):1080 - 1089
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (952 KB)

    Space-variant (or foveating) vision architectures are of importance in both machine and biological vision. In this paper, we focus on a particular space-variant map, the log-polar map, which approximates the primate visual map, and which has been applied in machine vision by a number of investigators during the past two decades. Associated with the log-polar map, we define a new linear integral tr... View full abstract»

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  • Discrete Voronoi diagrams and the SKIZ operator: a dynamic algorithm

    Publication Year: 1997, Page(s):1165 - 1170
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    The Voronoi diagram (VD) is a popular tool for partitioning the support of an image. An algorithm is presented for constructing VD when the seed set, which determines the Voronoi regions, can be modified by adding and removing seeds. The number of pixels and seeds revisited for updating the diagram and the neighbor relationships among seeds is minimized. A result on cocircular seeds is presented. ... View full abstract»

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  • Matching sets of 3D line segments with application to polygonal arc matching

    Publication Year: 1997, Page(s):1090 - 1099
    Cited by:  Papers (22)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    In this paper, we consider two sets of corresponding 3D line segments of equal length. We derive a closed-form solution for the coordinate transform (rotation and translation) that gives the best match between the two sets; best in the sense of a least-squares distance measure between the sets. We use these results as the basis to construct efficient algorithms for solving other problems in comput... 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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Editor-in-Chief
David A. Forsyth
University of Illinois
e-mail: daf@illinois.edu