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IEEE Transactions on Pattern Analysis and Machine Intelligence

Issue 12 • Date Dec 1991

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Displaying Results 1 - 8 of 8
  • Camera calibration: a quick and easy way to determine the scale factor

    Publication Year: 1991, Page(s):1240 - 1245
    Cited by:  Papers (55)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB)

    The author presents a quick and easy solution to the camera calibration problem of finding the scale factor that arises because of a difference between the scanning frequency of the camera sensor plane and the scanning frequency of the image capture board frame buffer. The method presented is based on the observation that the scale factor is related to the distortion in an image of a circle: this ... View full abstract»

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  • Building a sonar map in a specular environment using a single mobile sensor

    Publication Year: 1991, Page(s):1260 - 1269
    Cited by:  Papers (87)  |  Patents (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (700 KB)

    The physical properties of acoustic sensors are exploited to obtain information about the environment for sonar map building. A theoretical formulation for interpreting the sensor databases on the physical principles of acoustic propagation and reflection is presented. A characterization of the sonar scan that allows the differentiation of planes, corners, and edges in a specular environment is de... View full abstract»

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  • A computationally compact divergence measure for speech processing

    Publication Year: 1991, Page(s):1255 - 1260
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    The directed divergence, which is a measure based on the discrimination information between two signal classes, is investigated. A simplified expression for computing the directed divergence is derived for comparing two Gaussian autoregressive processes such as those found in speech. This expression alleviates both the computational cost (reduced by two thirds) and the numerical problems encounter... View full abstract»

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  • Synthesis and recognition of sequences

    Publication Year: 1991, Page(s):1245 - 1255
    Cited by:  Papers (13)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    A string or sequence is a linear array of symbols that come from an alphabet. Due to unknown substitutions, insertions, and deletions of symbols, a sequence cannot be treated like a vector or a tuple of a fixed number of variables. The synthesis of an ensemble of sequences is a sequence of random elements that specify the probabilities of occurrence of the different symbols at the corresponding si... View full abstract»

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  • On the verification of hypothesized matches in model-based recognition

    Publication Year: 1991, Page(s):1201 - 1213
    Cited by:  Papers (83)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1156 KB)

    Model-based recognition methods generally use ad hoc techniques to decide whether or not a model of an object matches a given scene. The most common such technique is to set an empirically determined threshold on the fraction of model features that must be matched to data features. Conditions under which to accept a match as correct are rigorously derived. The analysis is based on modeling the rec... View full abstract»

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  • The geometry of basis sets for morphologic closing

    Publication Year: 1991, Page(s):1214 - 1224
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (812 KB)

    P. Maragos (1989) provided a framework for the decomposition of many morphologic operations into orthogonal components or basis sets. Using this framework, a method to find the minimal basis set for the important operation of closing in two dimensions is described. The closing basis sets are special because their elements are members of an ordered, global set of closing shapes or primitives. The s... View full abstract»

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  • Minimax search algorithms with and without aspiration windows

    Publication Year: 1991, Page(s):1225 - 1235
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1020 KB)

    Investigation of several algorithms for computing exact minimax values of game trees (utilizing backward pruning) are discussed. The focus is on trees with an ordering similar to that actually found in game playing practice. The authors compare the algorithms using two different distributions of the static values, the uniform distribution and a distribution estimated from practical data. A systema... View full abstract»

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  • Direct computation of qualitative 3-D shape and motion invariants

    Publication Year: 1991, Page(s):1236 - 1240
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (516 KB)

    Structure from motion often refers to the computation of three-dimensional structure from a matched sequence of images. However, a depth map of a surface is difficult to compute and may not be a good representation for storage and recognition. Given matched images it is shown that the sign of the normal curvature in a given direction at a given point in the image can be computed from a simple diff... 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