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Sixth International Conference on Computer Vision (IEEE Cat. No.98CH36271)

7-7 Jan. 1998

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  • Sixth International Conference on Computer Vision (IEEE Cat. No.98CH36271)

    Publication Year: 1998
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    Freely Available from IEEE
  • Contents

    Publication Year: 1998, Page(s):iv - xiii
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    Freely Available from IEEE
  • Comparing curved-surface range image segmenters

    Publication Year: 1998, Page(s):286 - 291
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (948 KB)

    This work focuses on creating a framework for objectively evaluating the performance of range image segmentation algorithms. The algorithms are evaluated in terms of correct segmentation, over- and under-segmentation, missed and noise regions. A set of images with ground truth was created for this work. The images were captured using a structured light scanner. Images used in the evaluation contai... View full abstract»

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  • Author index

    Publication Year: 1998, Page(s):1161 - 1164
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    Freely Available from IEEE
  • 3D shape reconstruction using volume intersection techniques

    Publication Year: 1998, Page(s):1095 - 1100
    Cited by:  Papers (4)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (620 KB)

    Volume intersection algorithms are used to reconstruct incomplete objects from their silhouettes. An imagined light source is moved about the data and the cumulative amount of “light” seen at each point an space is interpreted as indicating the likelihood that the point is inside the object. The object data need not be uniformly distributed nor exclusively surface data. Explicit distin... View full abstract»

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  • Integrated surface, curve and junction inference from sparse 3-D data sets

    Publication Year: 1998, Page(s):818 - 824
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (816 KB)

    We are interested in descriptions of 3-D data sets, as obtained from stereo or a 3-D digitizer. We therefore consider as input a sparse set of points, possibly associated with orientation information. In this paper, we address the problem of inferring integrated high-level descriptions such as surfaces, curves, and junctions from a sparse point set. While the method described previously provides e... View full abstract»

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  • Sectored snakes: evaluating learned-energy segmentations

    Publication Year: 1998, Page(s):420 - 426
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (764 KB)

    We describe how to teach deformable models to maximize image segmentation correctness based on user-specified criteria, and we present a method for evaluating which criteria work best. We present sectored snakes, a formulation that demonstrably improves upon regular snakes. A traditional deformable model (“snake” in 2D) fails to find an object's boundary when the strongest nearby image... View full abstract»

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  • Stereo with mirrors

    Publication Year: 1998, Page(s):1087 - 1094
    Cited by:  Papers (45)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1188 KB)

    In this paper, we propose the use of mirrors and a single camera for computational stereo. When compared to conventional stereo systems that use two cameras, our method has a number of significant advantages such as wide field of view, single viewpoint projection, identical camera parameters and ease of calibration. We propose four stereo systems that use a single camera pointed towards planar, el... View full abstract»

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  • Optimal recovery of depth from defocused images using an MRF model

    Publication Year: 1998, Page(s):1047 - 1052
    Cited by:  Papers (11)  |  Patents (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (572 KB)

    A MAP-MRF based scheme is proposed for simultaneous recovery of the depth and the focused image of a scene from two defocused images. The space-variant blur parameter and the focused image of the scene are both modeled as MRFs and their MAP estimates are obtained using simulated annealing. The performance of the proposed scheme is tested on synthetic as well as real data and the estimates of the d... View full abstract»

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  • Fish-scales: representing fuzzy manifolds

    Publication Year: 1998, Page(s):811 - 817
    Cited by:  Papers (7)  |  Patents (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (836 KB)

    We address the problem of automatically reconstructing m-manifolds of unknown topology from unorganized points in metric p-spaces obtained from a noisy measurement process . The point set is first approximated by a collection of oriented primitive fuzzy sets over a range of resolutions. Hierarchical multiresolution representation is then computed based on the relation of relative containment defin... View full abstract»

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  • Optimal polyline tracking for artery motion compensation in coronary angiography

    Publication Year: 1998, Page(s):414 - 419
    Cited by:  Papers (11)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1212 KB)

    We propose a novel solution to the problem of motion compensation of coronary angiographs. As the heart is beating, it is difficult for the physician to observe closely a particular point (e.g. stenosis) on the artery tree. We propose, to rigidly compensate the sequence so that the area around the point of interest appears stable. This is a difficult problem because the arteries deform in a non-ri... View full abstract»

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  • Reading between the lines-a method for extracting dynamic 3D with texture

    Publication Year: 1998, Page(s):1081 - 1086
    Cited by:  Papers (6)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1016 KB)

    A method is presented that extracts the 3D shape of objects, together with the surface texture. Both shape and texture are obtained from a single image. The underlying principle is based on an active technique. A high resolution, pattern is projected onto the object and the deformations as observed by a single camera yield the 3rd dimension. Furthermore, the surface texture is extracted from the s... View full abstract»

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  • 3D photography on your desk

    Publication Year: 1998, Page(s):43 - 50
    Cited by:  Papers (63)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1112 KB)

    A simple and inexpensive approach for extracting the three-dimensional shape of objects is presented. It is based on `weak structured lighting'; it differs from other conventional structured lighting approaches in that it requires very little hardware besides the camera: a desk-lamp, a pencil and a checker-board. The camera faces the object, which is illuminated by the desk-lamp. The user moves a ... View full abstract»

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  • Constructing virtual worlds using dense stereo

    Publication Year: 1998, Page(s):3 - 10
    Cited by:  Papers (105)  |  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1892 KB)

    We present Virtualized Reality, a technique to create virtual worlds out of dynamic events using densely distributed stereo views. The intensity image and depth map for each camera view at each time instant are combined to form a Visible Surface Model. Immersive interaction with the virtualized event is possible using a dense collection of such models. Additionally, a Complete Surface Model of eac... View full abstract»

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  • 3D modeling and tracking of human lip motions

    Publication Year: 1998, Page(s):337 - 343
    Cited by:  Papers (14)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (916 KB)

    We address the problem of tracking and reconstructing 3D human lip motions from a 2D view. This problem is challenging due both to the complex nature of lip motions and the minimal data available from a raw video stream of the face. We counter both of these difficulties with statistical approaches. We first build a physically-based 3D model of lips and train it to cover only the subspace of lip mo... View full abstract»

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  • Contagion-driven image segmentation and labeling

    Publication Year: 1998, Page(s):255 - 260
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (876 KB)

    We propose a segmentation method based on Polya's urn model for contagious phenomena. Initial labeling of the pixel is obtained using a Maximum Likelihood (ML) estimate or the Nearest Mean Classifier (NMC), which are used to determine the initial composition of an urn representing the pixel. The resulting urns are then subjected to a modified urn sampling scheme mimicking the development of an inf... View full abstract»

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  • Modeling geometric structure and illumination variation of a scene from real images

    Publication Year: 1998, Page(s):1041 - 1046
    Cited by:  Papers (16)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1400 KB)

    We present in this paper a system which automatically builds, from real images, a scene model containing both 3D geometric information of the scene structure and its photometric information under various illumination conditions. The geometric structure is recovered from images taken from distinct viewpoints. Structure-from-motion and correlation-based stereo techniques are used to match pixels bet... View full abstract»

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  • Shape recovery using dynamic subdivision surfaces

    Publication Year: 1998, Page(s):805 - 810
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    A new dynamic subdivision surface model is proposed for shape recovery from 3D data sets. The model inherits the attractive properties of the Catmull-Clark subdivision scheme and is set in a physics-based modeling paradigm. Unlike other existing methods, our model does not require a parameterized input mesh to recover shapes of arbitrary topology, allows direct manipulation of the limit surface vi... View full abstract»

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  • Robust contour tracking in echocardiographic sequences

    Publication Year: 1998, Page(s):408 - 413
    Cited by:  Papers (12)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    In this paper we present an evaluation of a robust visual image tracker on echocardiographic image sequences. We show how the tracking framework can be customised to define an appropriate shape-space that describes heart shape deformations that can be learnt from a training data set. We also investigate an energy-based temporal boundary enhancement method to improve image feature measurement. Prel... View full abstract»

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  • Depth discontinuities by pixel-to-pixel stereo

    Publication Year: 1998, Page(s):1073 - 1080
    Cited by:  Papers (65)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1064 KB)

    An algorithm to detect depth discontinuities from a stereo pair of images is presented. The algorithm matches individual pixels in corresponding scanline pairs while allowing occluded pixels to remain unmatched, then propagates the information between scanlines by means of a fast postprocessor. The algorithm handles large untextured regions, uses a measure of pixel dissimilarity that is insensitiv... View full abstract»

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  • A theory of catadioptric image formation

    Publication Year: 1998, Page(s):35 - 42
    Cited by:  Papers (145)  |  Patents (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    Conventional video cameras have limited fields of view which make them restrictive for certain applications in computational vision. A catadioptric sensor uses a combination of lenses and mirrors placed in a carefully arranged configuration to capture a much wider field of view. When designing a catadioptric sensor, the shape of the mirror(s) should ideally be selected to ensure that the complete ... View full abstract»

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  • Egomotion estimation using log-polar images

    Publication Year: 1998, Page(s):967 - 972
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (820 KB)

    We address the problem of egomotion estimation of a monocular observer moving with arbitrary translation and rotation in an unknown environment, using log-polar images. The method we propose is uniquely based on the spatio-temporal image derivatives, or the normal flow. Thus, we avoid computing the complete optical flow field, which is an ill-posed problem due to the aperture problem. We use a sea... View full abstract»

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  • Face surveillance

    Publication Year: 1998, Page(s):646 - 651
    Cited by:  Papers (1)  |  Patents (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (552 KB)

    Most of the research on face recognition addresses the MATCH problem and it assumes a closed universe where there is no need for a REJECT (`false positive') option. The SURVEILLANCE problem is addressed indirectly, if at all, through the MATCH problem, where the size of the gallery rather than that of the probe set is very large. This paper addresses the proper surveillance problem where the size ... View full abstract»

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  • Recognition and interpretation of parametric gesture

    Publication Year: 1998, Page(s):329 - 336
    Cited by:  Papers (26)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (780 KB)

    A new method for the representation, recognition, and interpretation of parameterized gesture is presented. By parameterized gesture. We mean gestures that exhibit a meaningful variation; one example is a point gesture where the important parameter is the 2-dimensional direction. Our approach is to extend the standard hidden Markov model method of gesture recognition by including a global parametr... View full abstract»

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  • Robotic control with partial visual information

    Publication Year: 1998, Page(s):883 - 888
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (708 KB)

    We consider a class of control tasks, which rely from partial visual information in a robotic setting. These tasks are hard in the sense that at every given moment, the available information is insufficient for the control task. Still, the amount of information collected throughout the control process is large and thus seems sufficient for carrying out the task. Such situations commonly arise when... View full abstract»

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