Workshop on Motion and Video Computing, 2002. Proceedings.

9-9 Dec. 2002

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  • Proceedings Workshop on Motion and Video Computing (MOTION 2002)

    Publication Year: 2002
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    Freely Available from IEEE
  • Author index

    Publication Year: 2002, Page(s): 257
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    Freely Available from IEEE
  • On the binding mechanism of synchronised visual events

    Publication Year: 2002, Page(s):112 - 117
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (514 KB) | HTML iconHTML

    We address the problem of interpreting visual surveillance data by learning appropriate spatio-temporal subspaces of active image regions caused by scene activities. We focus on identifying regions of sustained change for recognising key stages of a visual behaviour. Our behaviour representation is based on the asynchrony or delay patterns of occurrence among local events which need not be spatial... View full abstract»

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  • Video frame categorization using sort-merge feature selection

    Publication Year: 2002, Page(s):72 - 77
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (281 KB) | HTML iconHTML

    Feature selection for video categorization is impractical with existing techniques. We present a novel algorithm to select a very small subset of image features. We reduce the cardinality of the input data by sorting the individual features by their effectiveness in categorization, and then merging pairwise these features into feature sets of cardinality two. Repeating this sort-merge process seve... View full abstract»

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  • Hybrid Monte Carlo filtering: edge-based people tracking

    Publication Year: 2002, Page(s):151 - 158
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1851 KB) | HTML iconHTML

    Statistical inefficiency often limits the effectiveness of particle filters for high-dimensional Bayesian tracking problems. To improve sampling efficiency on continuous domains, we propose the use of a particle filter with hybrid Monte Carlo (HMC), an MCMC (Markov chain Monte Carlo) method that follows posterior gradients toward. high probability states, while ensuring a properly weighted approxi... View full abstract»

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  • Segmentation and tracking of interacting human body parts under occlusion and shadowing

    Publication Year: 2002, Page(s):105 - 111
    Cited by:  Papers (29)  |  Patents (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB) | HTML iconHTML

    The paper presents a system to segment and track multiple body parts of interacting humans in the presence of mutual occlusion and shadow. The color image sequence is processed at three levels: pixel level, blob level, and object level. A Gaussian mixture model is used at the pixel level to train and classify individual pixel colors. A Markov random field (MRF) framework is used at the blob level ... View full abstract»

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  • Indexing key positions between multiple videos

    Publication Year: 2002, Page(s):65 - 71
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (518 KB) | HTML iconHTML

    Given two or more video sequences containing similar human activities (running, jumping, etc.), we want to devise a method which extracts spatio-temporal signatures associated with these activities, compares these signatures, and aligns key positions from different videos. We introduce a method which, in conjunction with a number of hypotheses, allows the analysis of the motion of specific body pa... View full abstract»

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  • Automatic detection of rigid point matches

    Publication Year: 2002, Page(s):235 - 240
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB) | HTML iconHTML

    The perspective projections of n physical points on two views (stereovision) are constrained as soon as n ≥ 8. However, to prove, in practice, the existence of a rigid motion between two images, more than 8 point matches are desirable in order to compensate for the limited accuracy of the matches. We propose a computational definition of rigidity and a probabilistic criterion to rate the meanin... View full abstract»

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  • Bayesian-based performance prediction for gait recognition

    Publication Year: 2002, Page(s):145 - 150
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4225 KB) | HTML iconHTML

    Existing gait recognition approaches do not give their theoretical or experiential performance predictions. Therefore, the discriminating power of gait as a feature for human recognition cannot be evaluated. We first propose a kinematic-based approach to recognize humans by gait. The proposed. approach estimates 3D human walking parameters by performing a least squares fit of the 3D kinematic mode... View full abstract»

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  • Directed acyclic graph representation of deformable models

    Publication Year: 2002, Page(s):84 - 89
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3531 KB) | HTML iconHTML

    Deformable models are a useful tool in computer vision and computer graphics. A deformable model is a curve (in two dimensions) or a surface (in three dimensions), whose shape, position, and orientation are controlled through a set of parameters. Deformable models can represent manufactured objects, human faces and skeletons, and even bodies of fluid. In computer graphics, we use deformable models... View full abstract»

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  • Multi view image surveillance and tracking

    Publication Year: 2002, Page(s):169 - 174
    Cited by:  Papers (60)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (848 KB) | HTML iconHTML

    The paper presents a set of methods for multi view image tracking using a set of calibrated cameras. We demonstrate how effective the approach is for resolving occlusions and tracking objects between overlapping and non-overlapping camera views. Moving objects are initially detected using background subtraction. Temporal alignment is then performed between each video sequence in order to compensat... View full abstract»

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  • How well can wavelet denoising improve the accuracy of computing fundamental matrices?

    Publication Year: 2002, Page(s):247 - 252
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (531 KB) | HTML iconHTML

    The existence of noise is a serious obstacle for solving many computer vision problems. Computing the fundamental matrix is a typical one. Motivated by the success of the wavelet denoising technique in image processing, we study the interesting topic of how well wavelet denoising can improve the accuracy of computing fundamental matrices. The answer depends on: 1) what wavelets should be applied; ... View full abstract»

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  • Capturing human hand motion in image sequences

    Publication Year: 2002, Page(s):99 - 104
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (511 KB) | HTML iconHTML

    Visually capturing human hand motion requires estimating the 3D hand global pose as well as its local finger articulations. This is a challenging task that requires a search in a high dimensional space due to the high degrees of freedom that fingers exhibit and the self occlusions caused by global hand motion. We propose a divide and conquer approach to estimate both global and local hand motion. ... View full abstract»

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  • A variational framework for active and adaptative segmentation of vector valued images

    Publication Year: 2002, Page(s):56 - 61
    Cited by:  Papers (79)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (629 KB) | HTML iconHTML

    Much effort has been made in integrating different information in a variational framework to segment images. Recent works on curve propagation were able to incorporate stochastic information (see Paragios, N. and Deriche, R., J. Visual Commun. and Image Representation, 2002; Zhu, S. and Yuille, A., 1996) and prior knowledge on shapes (see Cremers, D. et al., 2002; Rousson M. and Paragios, N., 2002... View full abstract»

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  • Infinitesimal motion estimation from multiple central panoramic views

    Publication Year: 2002, Page(s):229 - 234
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (295 KB) | HTML iconHTML

    We present an algorithm for infinitesimal motion estimation from multiple central panoramic views. We first derive the optical flow equations for central panoramic cameras as a function of both pixel coordinates and back-projection rays. We then derive a rank constraint on the optical flows across many frames, which must lie in a six dimensional subspace of a higher-dimensional space. We then prop... View full abstract»

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  • Segmentation of dynamic scenes from image intensities

    Publication Year: 2002, Page(s):44 - 49
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB) | HTML iconHTML

    We present an algebraic geometric approach for segmenting both static and dynamic scenes from image intensities. We introduce the multibody affine constraint as a geometric relationship between the motion of multiple objects and the image intensities generated by them. This constraint is satisfied by all the pixels, regardless of the body to which they belong and regardless of depth discontinuitie... View full abstract»

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  • A three-mode expressive feature model of action effort

    Publication Year: 2002, Page(s):139 - 144
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (291 KB) | HTML iconHTML

    We present an expressive feature model for recognizing the performance effort of human actions. A set of low and high effort examples for an action are initially factored into its three-mode principal components, followed by a learning phase to compute the expressive features required to bring the model estimation of effort into agreement with perceptual judgements. The approach is demonstrated us... View full abstract»

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  • A hierarchical approach for obtaining structure from two-frame optical flow

    Publication Year: 2002, Page(s):214 - 219
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4332 KB) | HTML iconHTML

    A hierarchical iterative algorithm is proposed for extracting structure from two-frame optical flow. The algorithm exploits two facts: one is that in many applications, such as face and gesture recognition, the depth variation of the visible surface of an object in a scene is small compared to the distance between the optical center and the object; the other is that the time aliasing problem is al... View full abstract»

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  • Robust probabilistic estimation of uncertain appearance for model-based tracking

    Publication Year: 2002, Page(s):28 - 33
    Cited by:  Papers (2)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (405 KB) | HTML iconHTML

    We present a method for appearance management for model-based visual tracking. The approach provides a concise mechanism for mapping image information to a model surface by taking into consideration uncertainties from the mapping process and by propagating appearance information from visible high-confidence surface regions to hidden or low-confidence regions. The method allows acquiring and utiliz... View full abstract»

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  • Model-based integration of visual cues for hand tracking

    Publication Year: 2002, Page(s):118 - 124
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB) | HTML iconHTML

    We present a model based approach to the integration of multiple cues for tracking high degree of freedom articulated motions and apply it to the problem of hand tracking using a single camera sequence. Hand tracking is particularly challenging because of occlusions, shading variations, and the high dimensionality of the motion. The novelty of our approach is in the combination of multiple sources... View full abstract»

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  • Object localization in metric spaces for video linking

    Publication Year: 2002, Page(s):78 - 83
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (490 KB) | HTML iconHTML

    Objects often constitute the desired level of access for browsing and retrieval in video databases. We present an approach to create links between video segments that contain objects of interest, based on video structuring, object definition, and stochastic localization in the video structure. Localization is formulated in the metric mixture model framework, which allows for the joint probabilisti... View full abstract»

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  • Particle filter with analytical inference for human body tracking

    Publication Year: 2002, Page(s):159 - 165
    Cited by:  Papers (14)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (569 KB) | HTML iconHTML

    The paper introduces a framework that integrates analytical inference into the particle filtering scheme for human body tracking. The analytical inference is provided by body parts detection, and is used to update subsets of state parameters representing the human pose. This reduces the degree of randomness and decreases the required number of particles. This new technique is a significant improve... View full abstract»

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  • Density estimation-based information fusion for multiple motion computation

    Publication Year: 2002, Page(s):241 - 246
    Cited by:  Papers (3)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1180 KB) | HTML iconHTML

    Vision tasks, such as motion analysis, object tracking, robot localization, and 3D modeling, often require the fusion of estimates coming from different sources. Most of the fusion algorithms, however, are not robust with respect to outliers and only consider one source models. Their performance deteriorates when initial assumptions are not valid (e.g., the presence of outliers in the data or data... View full abstract»

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  • Tracking video objects using active contours

    Publication Year: 2002, Page(s):90 - 95
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (438 KB) | HTML iconHTML

    We address the problem of tracking video objects through several frames. We present a new tracking algorithm using the active contour theory framework. Our first contribution is to define a new tracking criterion combining geometrical and region-based features. Our second contribution is to provide the differentiation of the criterion and to deduce the evolution equation of the active contour. Fin... View full abstract»

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  • Ghost3D: detecting body posture and parts using stereo

    Publication Year: 2002, Page(s):175 - 180
    Cited by:  Papers (4)  |  Patents (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (565 KB) | HTML iconHTML

    The paper describes how to detect human posture and upper body parts using overhead narrow-baseline stereo cameras. This information is extracted to understand retail customer behavior while shopping. We propose an approach to detect body posture without using an explicit 3D human model. The proposed method is based on a 3D silhouette, a silhouette-ghost of a person, that is constructed from a 2D ... View full abstract»

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