Workshop on Motion and Video Computing, 2002. Proceedings.

9-9 Dec. 2002

Filter Results

Displaying Results 1 - 25 of 40
  • Proceedings Workshop on Motion and Video Computing (MOTION 2002)

    Publication Year: 2002
    Request permission for commercial reuse | |PDF file iconPDF (260 KB)
    Freely Available from IEEE
  • Author index

    Publication Year: 2002, Page(s): 257
    Request permission for commercial reuse | |PDF file iconPDF (160 KB)
    Freely Available from IEEE
  • Object detection with multiple cameras

    Publication Year: 2002, Page(s):187 - 192
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (3854 KB) | HTML iconHTML

    The paper presents an algorithm for detecting objects from multiple cameras. The algorithm (1) minimizes the effect of shadows, (2) detects and solves occlusion and (3) fuses objects that are detected in more than one camera. The algorithm was developed as part of SORTTS (soccer real-time tracking system), a tracking system based on a set of video cameras that covers a large area. The paper also r... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Real-time tracking of quad-marked surfaces

    Publication Year: 2002, Page(s):253 - 256
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (861 KB) | HTML iconHTML

    We introduce a real-time tracking procedure for a collection of quads marked on a surface. A fast image alignment is used for tracking individual quads, and local mutual relations are enforced for the corresponding collection of quad homographies. The resulting procedure runs at the video frame rate for a variety of moving surfaces. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Continuous multi-views tracking using tensor voting

    Publication Year: 2002, Page(s):181 - 186
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1028 KB) | HTML iconHTML

    The paper presents a new approach for continuous tracking of moving objects observed by multiple fixed cameras. The continuous tracking of moving objects in each view is realized using a tensor voting based approach. We infer objects' trajectories by performing a perceptual grouping in 2D+t using tensor voting. Also, a multi-scale approach to bridge gaps in object trajectories is presented The tra... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • From video sequences to motion panoramas

    Publication Year: 2002, Page(s):201 - 207
    Cited by:  Papers (12)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (354 KB) | HTML iconHTML

    We address the problem of constructing mosaics from video sequences taken by rotating cameras. In particular we investigate the widespread case where the scene is not only static but may also contain large dynamic areas, induced by moving or deforming objects. Most of the existing techniques fail to produce reliable results on such video sequences. For such alignment purposes, two classes of techn... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Shadow elimination for robust video surveillance

    Publication Year: 2002, Page(s):15 - 21
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (995 KB) | HTML iconHTML

    Variation in illumination conditions, caused by weather, season, time of day, etc., makes the task difficult when building surveillance systems of real world scenes. Especially, cast shadows produce troublesome appearance variations to accomplish monitoring with computer vision techniques, typically moving object tracking from a stationary viewpoint. To eliminate lighting effects robustly from ima... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Comparative study of coarse head pose estimation

    Publication Year: 2002, Page(s):125 - 130
    Cited by:  Papers (30)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (477 KB) | HTML iconHTML

    For many practical applications, it is sufficient to estimate a coarse head pose to infer gaze direction. Indeed, for any application in which the camera is situated unobtrusively in an overhead corner, the only possible inference is coarse pose because of the limitations of the quality and resolution of the incoming data. However, the vast majority of research in head pose estimation deals with t... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Tracking video objects using active contours

    Publication Year: 2002, Page(s):90 - 95
    Cited by:  Papers (4)
    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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Integrated region- and pixel-based approach to background modelling

    Publication Year: 2002, Page(s):3 - 8
    Cited by:  Papers (19)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (856 KB) | HTML iconHTML

    In this paper a new probabilistic method for background modelling is proposed, aimed at the application in video surveillance tasks using a monitoring static camera. Recently, methods employing time-adaptive, per pixel, mixture of Gaussians (TAPPMOG) modelling have become popular due to their intrinsic appealing properties. Nevertheless, they are not able per se to monitor global changes in the sc... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Video synthesis made simple with the X-slits projection

    Publication Year: 2002, Page(s):195 - 200
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (612 KB) | HTML iconHTML

    We propose novel algorithms for image based rendering (IBR) by simulating a new family of scene-to-image projections, the crossed-slits (X-slits) projections. New X-slits images can be easily generated from a sequence of images captured by a translating pinhole camera, and those images look compelling and realistic. We show how this can be used for rendering movies of virtual walkthroughs by a ver... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Interactive indoor scene reconstruction from image mosaics using cuboid structure

    Publication Year: 2002, Page(s):208 - 213
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (359 KB) | HTML iconHTML

    We describe a method for reconstructing indoor scenes from image mosaics using prior knowledge of the cuboid structure of the environment. The method is inspired by traditional approaches to the camera pose estimation problems known as the PnL (perspective n lines) and PnA (perspective n angles) problems. We show that a cuboid can be reconstructed from the images of three of its corners. The neces... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A linear model for simultaneous estimation of 3D motion and depth

    Publication Year: 2002, Page(s):220 - 225
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (435 KB) | HTML iconHTML

    A novel model for simultaneous estimation of full 3D motion and 3D position in world coordinates from multi camera sequences is presented. To this end scene flow (see Vedula, S. et al., ICCV 1999, p.722-9, 1999) and disparity are estimated in a single estimation step. The key idea is to interpret sequences of 2 or more cameras as one 4D data set. In this 4D space, a given motion model, a camera mo... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A robust subspace approach to layer extraction

    Publication Year: 2002, Page(s):37 - 43
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (482 KB) | HTML iconHTML

    Representing images with layers has many important applications, such as video compression, motion analysis, and 3D scene analysis. The paper presents a robust subspace approach to extracting layers from images reliably by taking advantage of the fact that homographies induced by planar patches in the scene form a low dimensional linear subspace. Such a subspace provides not only a feature space w... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • On the binding mechanism of synchronised visual events

    Publication Year: 2002, Page(s):112 - 117
    Cited by:  Papers (1)
    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»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • A hierarchical approach to robust background subtraction using color and gradient information

    Publication Year: 2002, Page(s):22 - 27
    Cited by:  Papers (154)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (338 KB) | HTML iconHTML

    We present a background subtraction method that uses multiple cues to detect objects robustly in adverse conditions. The algorithm consists of three distinct levels, i.e., pixel level, region level and frame level. At the pixel level, statistical models of gradients and color are separately used to classify each pixel as belonging to background or foreground. In the region level, foreground pixels... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Real-time posture and activity recognition

    Publication Year: 2002, Page(s):133 - 138
    Cited by:  Papers (7)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (497 KB) | HTML iconHTML

    We propose an algorithm for human posture and activity recognition for uncompressed and compressed (MPEG) video inputs. A real-time compression domain technique is developed to recognize different postures such as standing, pointing left/right, opening arms, etc. by using an eigenspace representation of human silhouettes obtained from AC-DCT coefficients. The system stores frames with specific pos... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.