Computer Vision, Imaging and Computer Graphics -- Theory and by Sebastiano Battiato, Sabine Coquillart, Robert S. Laramee,

By Sebastiano Battiato, Sabine Coquillart, Robert S. Laramee, Andreas Kerren, José Braz (eds.)

This e-book constitutes the refereed complaints of the eighth overseas convention, VISIGRAPP 2013 inclusive of the Joint meetings on desktop imaginative and prescient (VISAPP), the foreign convention on special effects, GRAPP 2013, and the foreign convention on details Visualization IVAPP 2013, held in Barcelona, Spain, in February 2013. The 15 revised complete papers offered have been conscientiously reviewed and chosen from 445 submissions. The papers are geared up in topical sections on idea and functions in machine imaginative and prescient, picture research, special effects, and knowledge visualization.

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4). g. n, prn, ls) or might even be beneficial (ex ). 3 Implementation and Complexity Our implementations of 3DSC and USC are based on the Point Cloud Library [18] with some modifications to improve the computation speed by removing redundant operations and including multi-threading with OpenMP [7]. A trilinear interpolation was included in the construction of the histograms as it was experimentally found to improve the performance of all tested descriptors. It is interesting to analyze the sign disambiguation step when deriving the axes for USC: the orientations of the generated normals were not consistently pointing inwards or outwards for 30 %–35 % of points.

This ensures we don’t lose mass because of dead particles in the particle generation step. From the previously computed gradient and laplacian and Eqs. 22 to 24 we detect the cells that have a breaking wave. Each cell will output the needed particle count that it needs. Then, with a prefix sum operation we can obtain an accumulated sum of the needed particles and use this result as the index at the particle array from which each cell will take their needed particle count. As particles have been sorted by TTL, we ensure the particles first taken in this step are those who had a lower TTL.

A recent comparison of geometric descriptors in the context of craniofacial landmark localization highlighted 3D shape contexts as one of the most accurate algorithms [21]. Shape contexts in 3D are based on the distribution of distances with respect to the point of interest, estimated by means of a histogram over a spherical grid (elevation, azimuth and radius). The spherical grid is centered at the point of interest and its North Pole is oriented in the direction of the normal to the surface. This is enough to uniquely determine the elevation and radial bins but leaves unresolved the origin of azimuth bins.

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