VVG: Vision, Video, and Graphics
https://diglib.eg.org:443/handle/10.2312/1028
2024-03-28T23:14:21Z
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Use of Computer Vision/ Computer Graphics Collaboration for 3D Rotoscopy
https://diglib.eg.org:443/handle/10.2312/vvg20051028
Use of Computer Vision/ Computer Graphics Collaboration for 3D Rotoscopy
Gagalowicz, André
Mike Chantler
This talk introduces 3D rotoscopy and its role in post-production applications, and the computer vision/computer graphics strategies used. The case of rigid objects is presented first, for which well-established approaches can be used. The case of articulated objects is considered next, with special attention to the case of a full human body tracking (ignoring significant shape deformations introduced by baggy clothes). Results related to the tracking of professional golfers and face tracking, a challenging case of deformable objects, will be presented. The talk will be concluded by a presentation of further, possible applications of research done at the MIRAGES laboratory at INRIA Rocquencourt.
2005-01-01T00:00:00Z
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Bitvectors for Robust Hierarchical Template Matching
https://diglib.eg.org:443/handle/10.2312/vvg20051024
Bitvectors for Robust Hierarchical Template Matching
Tweed, David
Mike Chantler
Many target detection problems involve objects where the primary variability in appearance is due to changes amongst characteristic configurations (as opposed to the systematic variability of object rotation or illumination changes). It is then important to utilise as much of the correlation between features as possible. Detecting pedestrians is such a problem and was tackled by Gavrila [Gav98] using a large set of exemplar templates combined with hierarchical matching via Distance Transforms. We describe a variant using a robust distance function and explicit allowance for occlusions. Our innovation is using bitwise logical operators to test against multiple exemplars in parallel.
2005-01-01T00:00:00Z
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A Model-Based Approach to Image Relighting with a Potential for Real-Time Implementation
https://diglib.eg.org:443/handle/10.2312/vvg20051032
A Model-Based Approach to Image Relighting with a Potential for Real-Time Implementation
Madsen, Claus B.; Laursen, Rune
Mike Chantler
Image relighting is a very unique special visual effect which promises to have many important practical applications. Image relighting is essentially the process of, given one or more images of some scene, computing what that scene would look like under some other (arbitrary) lighting conditions, e.g., changing positions and colors of light sources. Image relighting can for example be used for interior light design. This paper describes an approach to image relighting which can be implemented to run in real-time by utilizing graphics hardware, as opposed to other state-of-the-art approaches which at best run at a few frames per second.
2005-01-01T00:00:00Z
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Realistic Real-Time Hair Simulation and Rendering
https://diglib.eg.org:443/handle/10.2312/vvg20051031
Realistic Real-Time Hair Simulation and Rendering
Jung, Yvonne; Rettig, Alexander; Klar, Oliver; Lehr, Timo
Mike Chantler
We present a method for realistic rendering and simulation of human hair in real-time, which is suitable for the use in complex virtual reality applications. Neighbouring hairs are combined into wisps and animated with our cantilever beam based simulation system, which runs numerically stable and with interactive update rates. The rendering algorithm utilizes latest graphics hardware features and can even handle light coloured hair by including anisotropic reflection and internal transmission.
2005-01-01T00:00:00Z