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IEEE Transactions on Pattern Analysis and Machine Intelligence

Issue 5 • Date May 1989

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Displaying Results 1 - 8 of 8
  • Optical flow with an intensity-weighted smoothing

    Publication Year: 1989, Page(s):512 - 522
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1864 KB)

    Matching algorithms which use image structure such as edges and junctions cannot perform well on unstructured images. For such images, global gradient-based methods may be more appropriate. Some of the assumptions involved in applying discretized conservation equations such as the optical flow equation are discussed and an intensity-weighted method of estimating dense displacement fields is presen... View full abstract»

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  • A general aperture problem for direct estimation of 3-D motion parameters

    Publication Year: 1989, Page(s):528 - 536
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (836 KB)

    The necessary and sufficient conditions that an object should satisfy so that motion can be uniquely determined by a direct method are discussed. This direct method, based on the temporal-spatial gradient scheme, can estimate the three-dimensional (3-) motion parameters of a rigid moving object from an image sequence, by utilizing depth information of the object. It is shown that the 3-D motion ca... View full abstract»

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  • The precision of 3-D parameters in correspondence-based techniques: the case of uniform translational motion in a rigid environment

    Publication Year: 1989, Page(s):523 - 528
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    A general method of calculating the precision of environmental parameters which differs from conventional methods by finding analytical results, and which does so using only information in the image is discussed. This method called uncertainty-analysis, is applied to the case of first-order-error-based motion algorithms for determining environmental depth by matching corresponding points between t... View full abstract»

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  • A maximum likelihood framework for determining moving edges

    Publication Year: 1989, Page(s):499 - 511
    Cited by:  Papers (54)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1264 KB)

    The determination of moving edges in an image sequence is discussed. An approach is proposed that relies on modeling principles and likely hypothesis testing techniques. A spatiotemporal edge in an image sequence is modeled as a surface patch in a 3-D spatiotemporal space. A likelihood ratio test enables its detection as well as simultaneous estimation of its related attributes. It is shown that t... View full abstract»

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  • Motion and structure from orthographic projections

    Publication Year: 1989, Page(s):536 - 540
    Cited by:  Papers (46)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    S. Ullman's classical (1979) results on motion/structure from orthographic views are revisited. Specifically, two results are presented: (1) two orthographic views allow an uncountably infinite number of solutions to motion/structure of a rigid body, and (2) a linear algorithm for solving motion/structure from four point correspondences over three views View full abstract»

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  • Motion field and optical flow: qualitative properties

    Publication Year: 1989, Page(s):490 - 498
    Cited by:  Papers (101)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (728 KB)

    It is shown that the motion field the 2-D vector field which is the perspective projection on the image plane of the 3-D velocity field of a moving scene, and the optical flow, defined as the estimate of the motion field which can be derived from the first-order variation of the image brightness pattern, are in general different, unless special conditions are satisfied. Therefore, dense optical fl... View full abstract»

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  • Motion and structure from two perspective views: algorithms, error analysis, and error estimation

    Publication Year: 1989, Page(s):451 - 476
    Cited by:  Papers (162)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1900 KB)

    Deals with estimating motion parameters and the structure of the scene from point (or feature) correspondences between two perspective views. An algorithm is presented that gives a closed-form solution for motion parameters and the structure of the scene. The algorithm utilizes redundancy in the data to obtain more reliable estimates in the presence of noise. An approach is introduced to estimatin... View full abstract»

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  • Inherent ambiguities in recovering 3-D motion and structure from a noisy flow field

    Publication Year: 1989, Page(s):477 - 489
    Cited by:  Papers (94)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1096 KB)

    One of the major areas in research on dynamic scene analysis is recovering 3-D motion and structure from optical flow information. Two problems which may arise due to the presence of noise in the flow field are examined. First, motion parameters of the sensor or a rigidly moving object may be extremely difficult to estimate because there may exist a large set of significantly incorrect solutions w... 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