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New PDF release: Advances in computer graphics and computer vision :

By José Braz; et al

ISBN-10: 3540752722

ISBN-13: 9783540752721

ISBN-10: 3540752749

ISBN-13: 9783540752745

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Additional info for Advances in computer graphics and computer vision : international conferences, VISAPP and GRAPP 2006, Setúbal, Portugal, February 25-28, 2006 : revised selected papers

Example text

Third, a different graph matching procedure is utilized. Our proposed signature has a few important properties. First, it is invariant to nonrigid-transformations. For instance, given a human object, we expect its signature to be similar to signatures of other humans, whether they bend, fold their legs or point forward, as illustrated in Figure 1. In this figure, all the 19 humans in a database consisting of 388 objects, were ranked among the top 21 objects, and 17 among the top 17. Invariance to non-rigid-transformations is hard to achieve when only geometry is considered.

This is time consuming, especially the LOD changes a lot. In our approach the triangle strip length is limited, but they are static, and can be generated offline. Since the benefit of triangle strips decreases with their length, the overhead for processed vertices is small (as shown in section 5). In addition the whole striptification can be stored in a vertex buffer on the graphics card to further reduce the rendering time. This is not possible using dynamic triangle strips, as are used in the described approaches.

Showing LOD selection using the Stanford bunny: With increasing allowed pixel error the granularity of the mesh decreases significantly for the benefit of less vertices 4 Patch Enlargement Our purpose is to accelerate rendering by using triangle strips, because the number of processed vertices is a frame rate limiting factor. Since we construct a certain LOD out of several patches, triangle strips can only be defined within these patches. But an arc patch of the hierarchy contains only ≈ 2 triangles in average, so triangle strips are not very efficient.

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Advances in computer graphics and computer vision : international conferences, VISAPP and GRAPP 2006, Setúbal, Portugal, February 25-28, 2006 : revised selected papers by José Braz; et al


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