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Proceedings 1992 IEEE Computer Society Conference on Computer Vision and Pattern Recognition

15-18 June 1992

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Displaying Results 1 - 25 of 160
  • Indexing function-based categories for generic recognition

    Publication Year: 1992, Page(s):795 - 797
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    The authors report the implementation and evaluation of a function-based recognition system that takes an uninterrupted 3-D object shape as its input and reasons to determine if the object belongs to the superordinate category furniture, and if so, into which (sub)category it falls. The system has analyzed over 250 input objects, and the results largely agree with intuitive human interpretation of... View full abstract»

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  • Proceedings. 1992 IEEE Computer Society Conference on Computer Vision and Pattern Recognition (Cat. No.92CH3168-2)

    Publication Year: 1992
    Request permission for commercial reuse | PDF file iconPDF (20 KB)
    Freely Available from IEEE
  • The scale space aspect graph

    Publication Year: 1992, Page(s):335 - 340
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Currently the aspect graph is computed under the assumption of perfect resolution in the viewpoint, the projected image, and the object shape. Visual detail is represented that an observer might never see in practice. By introducing scale into this framework, a mechanism is provided for selecting levels of detail that are large enough to merit explicit representation, effectively allowing control ... View full abstract»

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  • Saliencies and symmetries: toward 3D object recognition from large model databases

    Publication Year: 1992, Page(s):322 - 327
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (509 KB)

    The construction of interpretation tables from database models is introduced, and a recognition procedure using scene feature groups is discussed. Techniques for extraction of feature group equivalence classes and computation of feature group saliency are discussed. Two methods to reduce the computational burdens associated with a large model database are proposed and tested on polyhedral objects.... View full abstract»

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  • Affine trackability aids obstacle detection

    Publication Year: 1992, Page(s):418 - 424
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    Potential obstacles in the path of a mobile robot that can often be characterized as shallow (i.e., their extent in depth is small compared to their distance from the camera) are considered. The constraint of affine trackability is applied to automatic identification and 3-D reconstruction of shallow structures in realistic scenes. It is shown how this approach can handle independent object motion... View full abstract»

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  • Right straight homogeneous generalized cylinders with symmetrical cross-sections: recovery of pose and shape from image contours

    Publication Year: 1992, Page(s):692 - 694
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    The straight homogeneous generalized cylinder (SHGC) comprises a class of objects for which recovery of pose and shape from image is generally an underconstrained problem. It is shown that for a major subclass of SHGCs, namely, the right straight homogeneous generalized cylinders, the 3-D pose (tilt and slant) and shape (cross section and scaling function) can be completely determined if the cross... View full abstract»

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  • Spatial-quefrency approach to optical echo analysis

    Publication Year: 1992, Page(s):850 - 852
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    A methodology for optical flow analysis based on cepstral filtering is introduced. The power cepstrum is extended to multiframe analysis. A correlative cepstral technique, cepsCorr, is developed. It significantly increases the signal-to-noise ratio, reduces ambiguities, and it provides a predictive or multievidence approach to visual motion analysis View full abstract»

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  • 3D model acquisition from monocular image sequences

    Publication Year: 1992, Page(s):209 - 215
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    Automatic building 3D models of objects and scenes from a sequence of 2D monocular images is approached by first building a partial model (possibly noisy) and then extending and refining it. The initial model is built by tracking and reconstructing shallow structures over a sequence of images using the constraint of affine trackability. This model is subsequently used to compute the pose that rela... View full abstract»

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  • Constructing perceptual categories

    Publication Year: 1992, Page(s):244 - 250
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (628 KB)

    It is shown how a parameterization of the structure of the observed object (interpretable as the space of dimensions of generative operations which brought the object into existence) entails a lattice that enumerates all the allowable categories and subcategories for the class of object, along with an inferential preference hierarchy among them. Each model is constrained to be generic in its param... View full abstract»

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  • Spatial reasoning based on multivariate belief functions

    Publication Year: 1992, Page(s):624 - 626
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    The authors propose knowledge representation and evidence propagation schemes based on multivariate belief functions and present a medical image recognition system to demonstrate the effectiveness of their application to spatial reasoning. The proposed system, which is based on the blackboard architecture, can mimic the reasoning process of a human expert in identifying the anatomical structures i... View full abstract»

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  • Direct motion stereo for passive navigation

    Publication Year: 1992, Page(s):425 - 431
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (628 KB)

    The problem of motion recovery for a head-eye system from stereo image sequences is addressed. Two types of motions, the translation of the vehicle and the panning motion of the head, are considered. It is shown how these motions and the depth map can be estimated directly from the measurements of image gradients and time derivatives. There is no need to estimate image motion, track a scene featur... View full abstract»

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  • On finding the ends of straight homogeneous generalized cylinders

    Publication Year: 1992, Page(s):695 - 698
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    Algorithms to detect pairs of edges that could be ends of a straight homogeneous generalized cylinder (SHGC) are proposed. Geometrical constraints for the ends of an SHGC are utilized to group edge elements and edge segments in a complex image. Two methods are investigated. The first algorithm is for a subset of SHGCs for which scaling factors of the cross section at both ends are the same. The se... View full abstract»

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  • The geometry of visual interception

    Publication Year: 1992, Page(s):741 - 743
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    Under the traditional paradigm of considering vision as a recovery problem, visual interception is just another application of the structure-from-motion module. However, the inherent difficulties of three-dimensional reconstruction have delayed any real-time applications. The authors offer a robust solution under the active qualitative vision paradigm. From the image intensity function, they obtai... View full abstract»

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  • A MRF approach to optical flow estimation

    Publication Year: 1992, Page(s):853 - 856
    Cited by:  Papers (6)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    A Markov random field (MRF) formulation for the problem of optical flow computation is studied. An adaptive window matching scheme is used to obtain a good measure of the correlation between the two images. A confidence measure for each match is also used. Thus, the input to the system is the adaptive correlation and the corresponding confidence. The MRF model is then used to estimate the velocity... View full abstract»

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  • Image sequence enhancement using multiple motions analysis

    Publication Year: 1992, Page(s):216 - 221
    Cited by:  Papers (21)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (668 KB)

    A method for detecting and tracking multiple moving objects, using both a large spatial region and a large temporal region, without assuming temporal motion constancy is described. When the large spatial region of analysis has multiple moving objects, the motion parameters and the locations of the objects are computed for one object after another. A method for segmenting the image plane into diffe... View full abstract»

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  • Perceptual organization using Bayesian networks

    Publication Year: 1992, Page(s):251 - 256
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    It is shown that the formalism of Bayesian networks provides an elegant solution, in a probabilistic framework, to the problem of integrating top-down and bottom-up visual processes as well serving as a knowledge base. The formalism is modified to handle spatial data and thus extends the applicability of Bayesian networks to visual processing. The modified form is called the perceptual inference n... View full abstract»

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  • Morphological decomposition of restricted domains: a vector space solution

    Publication Year: 1992, Page(s):627 - 629
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    Restricted domains, which are a restricted class of 2-D shapes, are defined. It is proved that any restricted domain can be decomposed as n-fold dilations of thirteen basis structuring elements and hence can be represented in a thirteen-dimensional space. This thirteen-dimensional space is spanned by the thirteen basis structuring elements comprising of lines, triangles, and a rhombus. It... View full abstract»

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  • Refinement of disparity estimates through the fusion of monocular image segmentations

    Publication Year: 1992, Page(s):486 - 492
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1184 KB)

    The authors examine how estimates of three-dimensional scene structure, as encoded in a scene disparity map, can be improved by the analysis of the original monocular imagery. They describe the utilization of surface illumination information provided by the segmentation of the monocular image into fine surface patches of nearly homogeneous intensity to remove mismatches generated during stereo mat... View full abstract»

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  • Hybrid weak-perspective and full-perspective matching

    Publication Year: 1992, Page(s):432 - 438
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (580 KB)

    Full-perspective mappings between 3-D objects and 2-D images are more complicated than weak-perspective mappings, which consider only rotation, translation, and scaling. Therefore, in 3-D model-based robot navigation, it is important to understand how and when full-perspective must be taken into account. A probabilistic combinatorial optimization algorithm is used to search for an optimal match be... View full abstract»

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  • Recovery of hierarchical part structure of 3-D shape from range image

    Publication Year: 1992, Page(s):699 - 702
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    A formulation of the part decomposition problem motived by the minimum-description-length (MDL) criteria is presented. Unlike previous MDL approaches which use analytic functions, a general geometric constraint, convexity, is used as a part constraint. Therefore, the method is suitable for complex natural shapes such as human faces. The recovery process consists of a bottom-up grouping process and... View full abstract»

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  • Nonlinear multiscale filtering using mathematical morphology

    Publication Year: 1992, Page(s):572 - 578
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (408 KB)

    A multiscale filtering scheme based on the three Matheron axioms for morphological openings is developed. It is shown that opening a signal with a gray scale operator does not introduce additional zero-crossings as one moves to coarser scales. Within this framework, the problem of choosing an appropriate structuring element is studied. In order to obtain a measure of the performance of different s... View full abstract»

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  • Autonomous fixation

    Publication Year: 1992, Page(s):744 - 747
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The author previously introduced a direct method, called fixation, for the recovery of shape and motion in the general case that uses neither feature correspondence nor optical flow. Instead, it directly uses the spatio-temporal gradients of image brightness. The experimental results of applying some of the author's fixation algorithms to a sequence of real images, where the motion is a combinatio... View full abstract»

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  • Recovering shape by purposive viewpoint adjustment

    Publication Year: 1992, Page(s):16 - 22
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    An approach for recovering surface shape from the occluding contour using an active (i.e., moving) observer is presented. It is based on a relationship between the geometries of a surface in a scene and its occluding contour: If the viewing direction of the observer is along a principal direction for a surface point whose projection is on the contour, surface shape (i.e., curvature) at the surface... View full abstract»

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  • Local reproducible smoothing without shrinkage

    Publication Year: 1992, Page(s):277 - 282
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    A simple local smoothing filter for curves or surfaces, combining the advantages of Gaussian smoothing and Fourier curve description, is defined. Unlike Gaussian filters, the filter described has no shrinkage problem. Repeated application of the filter does not yield a curve or surface smaller than the original, but simply reproduces the approximate result that would have been obtained by a single... View full abstract»

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  • On Poisson solvers and semi-direct methods for computing area based optical flow

    Publication Year: 1992, Page(s):857 - 860
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (400 KB)

    T. Simchony et al. (1990) proposed a semidirect method for computing area-based optical flow, based on the iterative application of a direct Poisson solver. This method is restricted to Dirichlet boundary conditions, i.e. it is applicable only when velocity vectors at the boundary of the domain are known a priori. It is shown, both experimentally and through analysis, that the semidirect method co... View full abstract»

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