Proceedings. 1991 IEEE Computer Society Conference on Computer Vision and Pattern Recognition

3-6 June 1991

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Displaying Results 1 - 25 of 147
  • Teleological computer graphics modeling

    Publication Year: 1991
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (43 KB)

    Summary form only give. Teleological modeling, a developing approach for creating abstractions and mathematical representations of physically realistic time-dependent objects, is described. In this approach, geometric constraint-properties, mechanical properties of objects, the parameters representing an object, and the control of the object are incorporated into a single conceptual framework. A t... View full abstract»

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  • Model group indexing for recognition

    Publication Year: 1991, Page(s):4 - 9
    Cited by:  Papers (16)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (481 KB)

    It is shown that an index space can be a powerful tool for reducing the image-model match search by a factor of k/sup G-3/, but only when accompanied by some mechanism, such as grouping, that prevents the system from having to consider all matches between image groups of size G and model groups of size G. It is also shown that if image groups are to index a single point at recognition time, then t... View full abstract»

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  • Planar shape classification using hidden Markov model

    Publication Year: 1991, Page(s):10 - 15
    Cited by:  Papers (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (391 KB)

    A planar shape-recognition approach is presented which is based on hidden Markov models and autoregressive parameters. This approach segments closed shapes into segments and explores the characteristic relations between consecutive segments to make classification at a finer level. The algorithm can tolerate much shape contour perturbation, and a moderate amount of occlusion. The overall classifica... View full abstract»

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  • Pose clustering on constraints for object recognition

    Publication Year: 1991, Page(s):16 - 21
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (405 KB)

    The authors investigate a way of improving Hough transform performance using the spatial relations that exist between model features. Clusters of scene features possibly belonging to a model are grouped by a series of one-dimensional Hough transforms. The results presented illustrate the effectiveness of the methods.<<ETX>> View full abstract»

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  • On the error analysis of 'geometric hashing'

    Publication Year: 1991, Page(s):22 - 27
    Cited by:  Papers (25)  |  Patents (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (478 KB)

    An experimental and theoretical analysis of the noise model in the geometric hashing technique is presented. The efficacy of the technique is discussed in the cases of affine transformations, similarities, and grid motions. The efficacy of the voting procedure, in geometric hashing is discussed, and it is shown that its introduction significantly reduces the expected burden of the verification sta... View full abstract»

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  • Multidimensional indexing for recognizing visual shapes

    Publication Year: 1991, Page(s):28 - 34
    Cited by:  Papers (23)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (614 KB)

    A homogeneous approach for acquisition, storage, and recognition of nonparametric shapes from images, using a novel shape representation based on shape autocorrelation operators is presented. A theoretical and experimental analysis of the computational complexity, recognition performance with increasing database size, and fault tolerance of the approach is presented. The system has been tested ext... View full abstract»

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  • Shape representation and recognition from curvature

    Publication Year: 1991, Page(s):35 - 41
    Cited by:  Papers (14)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (652 KB)

    An approach for describing objects for the purpose of recognition is developed. The authors deal with two key issues: building natural descriptions of curved objects, and making these descriptions compact and abstract. Typical examples of the types of curve one is able to describe as both qualitatively similar, yet discriminably different, are shown. Methods based on curvature extrema alone are li... View full abstract»

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  • Surface approximation using weighted splines

    Publication Year: 1991, Page(s):44 - 49
    Cited by:  Papers (11)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (525 KB)

    The surface reconstruction problem is formulated as a two-stage reconstruction procedure. The first stage is a robust local fit to the data in a multiresolution scheme and the second is a regularized least squares fit, with the addition of an adaptive mechanism in the smoothness functional in order to make the solution well behaved. The authors present the details of the second stage in which they... View full abstract»

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  • Use of monocular groupings and occlusion analysis in a hierarchical stereo system

    Publication Year: 1991, Page(s):50 - 56
    Cited by:  Papers (21)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (649 KB)

    A hierarchical stereo system is described that uses structural descriptions up to the surface level. Surface descriptions are computed from monocular images, by using a perceptual grouping technique. Occlusion can be a major problem in stereo analysis and is often not treated explicitly. An analysis is presented of occlusion effects in stereo, and it is shown how structural descriptions can be use... View full abstract»

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  • Curve-based stereo: figural continuity and curvature

    Publication Year: 1991, Page(s):57 - 62
    Cited by:  Papers (28)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (497 KB)

    An edge-based trinocular stereovision algorithm is presented. The primitives it works on are cubic B-spline approximations of the 2-D edges. This allows one to deal conveniently with curvature and to extend to some nonpolyhedral scenes to previous stereo algorithms. To build a matching primitive, the principle of the algorithm is, first, to find a triplet of corresponding points on three splines. ... View full abstract»

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  • A multiple-baseline stereo

    Publication Year: 1991, Page(s):63 - 69
    Cited by:  Papers (33)  |  Patents (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    A stereo matching method is presented which uses multiple stereo pairs with various baselines to obtain precise depth estimates without suffering from ambiguity. The stereo matching method uses multiple stereo pairs with different baselines generated by a lateral displacement of a camera. Matching is performed by computing the sum of squared-difference (SSD) values. The SSD functions for individua... View full abstract»

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  • Sampling and reconstruction with adaptive meshes

    Publication Year: 1991, Page(s):70 - 75
    Cited by:  Papers (91)  |  Patents (17)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (530 KB)

    An approach to visual sampling and reconstruction motivated by concepts from numerical grid generation is presented. Adaptive meshes that can nonuniformly sample and reconstruct intensity and range data are presented. These meshes are dynamic models which are assembled by interconnecting nodal masses with adjustable springs. Acting as mobile sampling sites, the nodes observe properties of the inpu... View full abstract»

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  • Stereopsis and image registration from extended edge features in the absence of camera pose information

    Publication Year: 1991, Page(s):76 - 82
    Cited by:  Papers (4)  |  Patents (3)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (591 KB)

    The authors solve the stereo correspondence problem in uncalibrated domains using extended edge contours as a source of primitives, as opposed to traditional point-based algorithms. This work represents a novel approach to implementation of the structural stereopsis concept of K.L. Boyr and A.C. Kak (1988), in particular with regard to speed. Judiciously exploiting the contiguity relation among pr... View full abstract»

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  • Application of a hybrid tracking algorithm to motion analysis

    Publication Year: 1991, Page(s):84 - 89
    Cited by:  Papers (6)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    An algorithm for tracking multiple feature positions in a dynamic image sequence is presented. This is achieved using a combination of two trajectory-based methods, with the resulting hybrid algorithm exhibiting the advantages of both. An optimizing exchange algorithm is described which enables short feature paths to be tracked without prior knowledge of the motion being studied. The resulting par... View full abstract»

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  • Algorithmic characterization of vehicle trajectories from image sequences by motion verbs

    Publication Year: 1991, Page(s):90 - 95
    Cited by:  Papers (43)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (621 KB)

    Images of vehicles which move in traffic scenes recorded by a stationary camera have been detected and tracked without operator intervention. The resulting vehicle trajectories were projected from the image plane onto the street plane. A suitable system internal representation of about 90 German motion verbs was then exploited in order to automatically characterize trajectory segments in terms of ... View full abstract»

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  • Using stereomotion to track binocular targets

    Publication Year: 1991, Page(s):96 - 102
    Cited by:  Papers (3)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    An algorithm is presented for the smooth tracking of a target in three-dimensional space by a binocular head which is capable of vergence, version, and tilt eye movements. This algorithm utilizes stereomotion channels to obtain a measurement of the three-dimensional velocity of the target, and then uses this velocity within a control loop to keep the target center at the fixation point of the bino... View full abstract»

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  • Establishing motion correspondence

    Publication Year: 1991, Page(s):103 - 108
    Cited by:  Papers (26)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    A proximal uniformity constraint is proposed to solve the correspondence problem. According to this constraint, most objects in the real world follow smooth paths and cover a small distance in a small time. An efficient, noniterative polynomial time approximation algorithm which minimizes the proximal uniformity cost function and establishes correspondence over n frames is proposed. Any method usi... View full abstract»

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  • Camera stability problem and dynamic stereo vision

    Publication Year: 1991, Page(s):109 - 114
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (443 KB)

    The authors show how stereo-based range data, obtained over time by a moving vehicle can be integrated without the explicit knowledge or computation of camera motion. A unique aspect of the approach is the transformation of range information into relative distances and encoding these distances in image registered maps. Results of experiments on dynamic stereo images, are presented.<<ETX>&... View full abstract»

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  • P-field: a computational model for binocular motion processing

    Publication Year: 1991, Page(s):115 - 120
    Cited by:  Papers (7)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    In a binocular camera system moving through the environment, it is possible to obtain a three-dimensional field of vectors, where each vector is parallel, to the actual inducing 3-D motion of an imaged point (relative to the moving camera), and scaled in magnitude by the depth of that point. The authors derive this 3-D vector field (the p-field), discuss its computation from the image quantities o... View full abstract»

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  • Finding the aspect-ratio of an imaging system

    Publication Year: 1991, Page(s):122 - 126
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (362 KB)

    Aspect-ratio is a fundamental parameter of an imaging system. It determines the extent of nonuniformity in sampling. Video signals guarantee a one-to-one match between the camera lines and the lines in the image buffer. The horizontal arrangement of pixels, however. undergoes a resampling due to the digitization process. The vertical spacing between lines is given by the vertical distance of the p... View full abstract»

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  • Camera models determination using multiple frames

    Publication Year: 1991, Page(s):127 - 132
    Cited by:  Papers (5)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (499 KB)

    An approach for determining the location and orientation of a camera mounted on an ALV (autonomous land vehicle) is proposed. The authors choose the road boundaries and the objects with vertical edges to be the calibration objects. During the calibration process, the ALV is supposed to move with pure translation. The camera models are derived by using two or three images under the assumptions that... View full abstract»

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  • Two plane camera calibration: a unified model

    Publication Year: 1991, Page(s):133 - 138
    Cited by:  Papers (17)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (417 KB)

    A unified model for camera calibration is presented. The model does not assume any explicit form of imaging process and can perform linear back projection while considering all lens distortions. This model is well suited to stereo reconstruction. It has been shown that the original two-plane model, the linear and nonlinear pin hole model, can all be realized as special cases of this model. With th... View full abstract»

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  • Relative positioning from geometric invariants

    Publication Year: 1991, Page(s):139 - 144
    Cited by:  Papers (28)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (383 KB)

    The author gives geometric constructive solutions for 3-D vision problems like positioning a point in space from two views. Using reference points in the scene, no calibration is needed. The method involves only simple geometric computation. From the experiments it is concluded that positioning 3-D points relatively to reference points, is easy and provides more reliable results than absolute posi... View full abstract»

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  • A screw motion approach to uniqueness analysis of head-eye geometry

    Publication Year: 1991, Page(s):145 - 151
    Cited by:  Papers (56)  |  Patents (15)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (527 KB)

    The screw motion theory is used to solve a class of pose determination problems that can be characterized by a homogeneous transform equation of the form AX=XB, where A and B are known motions and X is an unknown coordinate transformation. Unlike existing methods, this method gives rise to a sound geometric interpretation that takes both rotation and translation into consideration. The author deri... View full abstract»

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  • Computing viewpoints that satisfy optical constraints

    Publication Year: 1991, Page(s):152 - 158
    Cited by:  Papers (14)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (482 KB)

    The authors present techniques with which camera viewpoints can be automatically determined in order to satisfy the generic feature detectability requirements of resolution, focus, and field-of-view. These optical constraints are characterized analytically for a general thick lens model, and complete viewpoint loci that satisfy these constraints are obtained. The results discussed are useful for a... View full abstract»

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