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Fifth International Conference on 3-D Digital Imaging and Modeling (3DIM'05)
Hierarchical Coarse to Fine Depth Estimation for Realistic View Interpolation
Ottawa, Ontario, Canada
June 13-June 16
ISBN: 0-7695-2327-7
Indra Geys, Katholieke Universiteit Leuven
Luc Van Gool, Katholieke Universiteit Leuven and Swiss Federal Institute of Technology
This paper presents a novel approach for view synthesis and image interpolation. The algorithm is build up in a hierarchical way, and this on different structural levels instead of using a classic image pyramid. First coarse matching is done on a ?shape basis? only. A background-foreground segmentation yields a fairly accurate contour for every incoming video stream. Inter-relating these contours is a 1D problem and as such very fast. This step is then used to compute small position dependent bounding-boxes in 3D space which enclose the underlying object. The next step is a more expensive window based matching, within the volume of these bounding-boxes. This is limited to a number of regions around ?promising? feature points. Global regularisation is obtained by a graph cut. Speed results here from limiting the number of feature points. In a third step the interpolation is ?pre-rendered? and simultaneously evaluated on a per pixel basis. This is done by computing a Birchfield dissimilarity measure on the GPU. Per pixel parallelised operations keep computational cost low. Finally the bad interpolated parts are ?patched?. This per pixel correction yields the final interpolated view at the finest level. Here we will also deal explicitly with opacity at the borders of the foreground object.
Index Terms:
3-D from multiple images and video; Geometric signal processing; View Interpolation
Citation:
Indra Geys, Luc Van Gool, "Hierarchical Coarse to Fine Depth Estimation for Realistic View Interpolation," 3dim, pp.237-244, Fifth International Conference on 3-D Digital Imaging and Modeling (3DIM'05), 2005
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