Proceedings of the Seventh IEEE International Conference on Computer Vision

20-27 Sept. 1999

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  • Seventh International Conference on Computer Vision ICCV'99

    Publication Year: 1999, Page(s):0_1 - xxiii
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  • Index of authors

    Publication Year: 1999, Page(s):xxiv - xxvii
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    Freely Available from IEEE
  • Accurate motion flow estimation with discontinuities

    Publication Year: 1999, Page(s):695 - 702 vol.2
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (194 KB)

    We address the problem of motion flow estimation for a scene with multiple moving objects, observed from a possibly moving camera. We take as input a (possibly sparse) noisy velocity field, as obtained from local matching, produce a set of motion boundaries, and identify pixels with different velocities in overlapping layers. For a fixed observer, these overlapping layers capture occlusion informa... View full abstract»

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  • Real-time motion analysis with linear-programming

    Publication Year: 1999, Page(s):703 - 709 vol.2
    Cited by:  Papers (6)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (183 KB)

    A method to compute motion models in real time from point-to-line correspondences using linear programming is presented. Point-to-line correspondences are the most reliable motion measurements given the aperture effect, and it is shown how they can approximate other motion measurements as well. Using an L/sub 1/ error measure for image alignment based on point-to-line correspondences and minimizin... View full abstract»

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  • Multi-view subspace constraints on homographies

    Publication Year: 1999, Page(s):710 - 715 vol.2
    Cited by:  Papers (17)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (257 KB)

    The motion of a planar surface between two camera views induces a homography. The homography depends on the camera intrinsic and extrinsic parameters, as well as on the 3D plane parameters. While camera parameters vary across different views, the plane geometry remains the same. Based on this fact, the paper derives linear subspace constraints on the relative motion of multiple (/spl ges/2) planes... View full abstract»

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  • 3D articulated models and multi-view tracking with silhouettes

    Publication Year: 1999, Page(s):716 - 721 vol.2
    Cited by:  Papers (68)  |  Patents (7)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (279 KB)

    We propose a method to estimate the motion of a person filmed by two or more fixed cameras. The novelty of our technique is its ability to cope with fast movements, self-occlusions and noisy images. Our algorithms are based on the latest works on calibration and image segmentation developed in our lab. We compare the projections of a 3D model of a person on the images to the detected silhouettes o... View full abstract»

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  • Three-dimensional scene flow

    Publication Year: 1999, Page(s):722 - 729 vol.2
    Cited by:  Papers (121)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (171 KB)

    Scene flow is the three-dimensional motion field of points in the world, just as optical flow is the two-dimensional motion field of points in an image. Any optical flow is simply the projection of the scene flow onto the image plane of a camera. We present a framework for the computation of dense, non-rigid scene flow from optical flow. Our approach leads to straightforward linear algorithms and ... View full abstract»

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  • Registration of multiple point sets using the EM algorithm

    Publication Year: 1999, Page(s):730 - 736 vol.2
    Cited by:  Papers (9)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (282 KB)

    We address the problem of global registration between multiple d-dimensional point patterns with a given correspondence. The actual overlapping is not necessarily between pairs. Instead, it can be between any number of patterns. It is assumed that each pattern is a portion of an image of an unobserved object under a distinct rigid transformation. We derive an iterative solution for the problem of ... View full abstract»

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  • New algorithms for two-frame structure from motion

    Publication Year: 1999, Page(s):737 - 744 vol.2
    Cited by:  Papers (9)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (265 KB)

    We describe two new algorithms for two-frame structure from motion from tracked point features. One is the first fast algorithm for computing an exact least-squares estimate. It exploits our observation that the rotationally invariant least-squares error can be written in a simple form that depends just on the motion. The other is essentially as accurate as the least-squares estimate and is more e... View full abstract»

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  • Fast and accurate self-calibration

    Publication Year: 1999, Page(s):745 - 752 vol.2
    Cited by:  Papers (9)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    We describe new techniques for self-calibration and for recovering the motion from a projective reconstruction when the calibration is known. We show that our approach deals with the ambiguities in self-calibration produced by special motions. We extend our techniques to deal with varying calibration parameters. In passing, we prove convergence for the iterative projective-reconstruction algorithm... View full abstract»

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  • Removal of translation bias when using subspace methods

    Publication Year: 1999, Page(s):753 - 758 vol.2
    Cited by:  Papers (14)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (165 KB)

    Given estimates of the motion field (optic flow) from an image sequence, it is possible to recover translational direction, T/spl I.oarr/, using a variety of techniques. One such technique, known as "subspace methods, generates constraints which are perpendicular to T/spl I.oarr/, so that two distinct constraints allow a solution for T/spl I.oarr/. In practice many constraints are used in a least-... View full abstract»

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  • Densities and maximum likelihood estimation of matching constraints

    Publication Year: 1999, Page(s):759 - 764 vol.2
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (125 KB)

    In this paper we present a theory for obtaining densities that are important for computer vision. As a result of the theory we compute the exact and novel density of the slope of a line fitted to image points. This density makes it possible to obtain confidence intervals for the slope or to make hypothesis testing about if two intersecting lines form a corner or not. The theory also lets us derive... View full abstract»

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  • Recovery and tracking of continuous 3D surfaces from stereo data using a deformable dual-mesh

    Publication Year: 1999, Page(s):765 - 772 vol.2
    Cited by:  Papers (7)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (290 KB)

    We propose a novel method for continuous 3D depth recovery and tracking using calibrated stereo. The method integrates stereo correspondence, surface reconstruction and tracking by using a new single deformable dual mesh optimization, resulting in simplicity, robustness and efficiency. In order to combine stereo correspondence and structure recovery, the method introduces an external energy functi... View full abstract»

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  • Euclidean reconstruction and reprojection up to subgroups

    Publication Year: 1999, Page(s):773 - 780 vol.2
    Cited by:  Papers (9)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (145 KB)

    The necessary and sufficient conditions for being able to estimate scene structure, motion and camera calibration from a sequence of images are very rarely satisfied in practice. What exactly can be estimated in sequences of practical importance, when such conditions are not satisfied? In this paper we give a complete answer to this question. For every camera motion that fails to meet the conditio... View full abstract»

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  • Prediction error as a quality metric for motion and stereo

    Publication Year: 1999, Page(s):781 - 788 vol.2
    Cited by:  Papers (38)  |  Patents (13)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (166 KB)

    This paper presents a new methodology for evaluating the quality of motion estimation and stereo correspondence algorithms. Motivated by applications such as novel view generation and motion-compensated compression, we suggest that the ability to predict new views or frames is a natural metric for evaluating such algorithms. Our new metric has several advantages over comparing algorithm outputs to... View full abstract»

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  • Rigid and articulated motion seen with an uncalibrated stereo rig

    Publication Year: 1999, Page(s):789 - 796 vol.2
    Cited by:  Papers (4)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (129 KB)

    This paper establishes a link between uncalibrated stereo vision and the motion of rigid and articulated bodies. The variation in the projective reconstruction of a dynamic scene over time allows an uncalibrated stereo rig to be used as a faithful motion capturing device. We introduce an original theoretical framework-projective kinematics-which allows rigid and articulated motion to be represente... View full abstract»

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  • Detecting salient motion by accumulating directionally-consistent flow

    Publication Year: 1999, Page(s):797 - 804 vol.2
    Cited by:  Papers (5)  |  Patents (11)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (252 KB)

    Motion detection can play an important role in many vision tasks. Yet image motion can arise from "uninteresting" events as well as interesting ones. In this paper, salient motion is defined as motion that is likely to result from a typical surveillance target (e.g., a person or vehicle traveling with a sense of direction through a scene) as opposed to other distracting motions (e.g., the scintill... View full abstract»

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  • Monocular perception of biological motion-detection and labeling

    Publication Year: 1999, Page(s):805 - 812 vol.2
    Cited by:  Papers (9)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (201 KB)

    Computer perception of biological motion is key to developing convenient and powerful human-computer interfaces. Successful body tracking algorithms have been developed; however initialization is done by hand. We propose a method for detecting a moving human body and for labeling its parts automatically. It is based on maximizing the joint probability density function (PDF) of the position and vel... View full abstract»

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  • Polarization-based decorrelation of transparent layers: The inclination angle of an invisible surface

    Publication Year: 1999, Page(s):814 - 819 vol.2
    Cited by:  Papers (43)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    When a transparent surface is present between an observer and an object, an image reflected by the surface may be superimposed on the image of the observed object. We present a new approach to recover the scenes (layers) and to classify which is the reflected/transmitted one, based on imaging through a polarizing filter at two orientations. Estimates of the separate layers are obtained by weighted... View full abstract»

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  • Vision in bad weather

    Publication Year: 1999, Page(s):820 - 827 vol.2
    Cited by:  Papers (212)  |  Patents (6)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (323 KB)

    Current vision systems are designed to perform in clear weather. Needless to say, in any outdoor application, there is no escape from "bad" weather. Ultimately, computer vision systems must include mechanisms that enable them to function (even if somewhat less reliably) in the presence of haze, fog, rain, hail and snow. We begin by studying the visual manifestations of different weather conditions... View full abstract»

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  • The Hamilton-Jacobi skeleton

    Publication Year: 1999, Page(s):828 - 834 vol.2
    Cited by:  Papers (48)  |  Patents (5)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (362 KB)

    The eikonal equation and variants of it are of significant interest for problems in computer vision and image processing. It is the basis for continuous versions of mathematical morphology, stereo, shape-from-shading and for recent dynamic theories of shape. Its numerical simulation can be delicate, owing to the formation of singularities in the evolving front, and is typically based or, level set... View full abstract»

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  • Colour by correlation: a simple, unifying approach to colour constancy

    Publication Year: 1999, Page(s):835 - 842 vol.2
    Cited by:  Papers (49)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (130 KB)

    In this paper we consider the problem of colour constancy; how given an image of a scene under an unknown illuminant can we recover an estimate of that light? Rather than recovering a single estimate of the illuminant as many previous authors have done, in the first instance we recover a measure of the likelihood that each possible illuminant was the scene illuminant. We do this by correlating ima... View full abstract»

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  • The optimal axial interval in estimating depth from defocus

    Publication Year: 1999, Page(s):843 - 848 vol.2
    Cited by:  Papers (6)  |  Patents (4)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (107 KB)

    We analyze the effect of perturbations on the estimation of Depth from Defocus (DFD) implemented by changing the focus setting (e.g., axially moving the sensor). The analysis yields the optimal change of focus setting, and the spatial frequencies for which estimation is most robust. For stable estimation at all spatial frequencies, the change in focus setting should be less than twice the depth of... View full abstract»

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  • A representation of specular appearance

    Publication Year: 1999, Page(s):849 - 854 vol.2
    Cited by:  Papers (11)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (159 KB)

    The appearance of an object can vary considerably with changes in illumination conditions. Methods have been developed to describe these differences for diffuse reflection using the Lambertian model, but little work has been done in characterizing specular appearance. Towards a more comprehensive global reflectance descriptor, this paper focuses on a representation of specular appearance based on ... View full abstract»

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  • Estimation of diffuse and specular appearance

    Publication Year: 1999, Page(s):855 - 860 vol.2
    Cited by:  Papers (21)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (141 KB)

    To account for the variability of object appearance due to differences in illumination, attention has recently been focused on representing the set of images for all possible lighting conditions. Approaches that address this problem have primarily focused on lighting differences for diffuse reflection using the Lambertian model; however specular reflections can additionally present considerable di... View full abstract»

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