Warping of a spherical representation of image-based models on GPU
Proceedings of the 8th International Conference on Virtual Reality Continuum and its Applications in Industry
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We present a new forward image mapping algorithm, which speedsup perspective warping -- as in texture mapping. It processes thesource image in a special scanline order instead of the normalraster scanline order. This special scanline has the property of preservingparallelism when projecting to the target image. The algorithmreduces the complexity of perspective-correct image warpingby eliminating the division per pixel and replacing it with a divisionper scanline. The method also corrects the perspective distortionin Gouraud shading with negligible overhead. Furthermore, thespecial scanline order is suitable for antialiasing using a more accurateantialiasing conic filter, with minimum additional cost. Thealgorithm is highlighted by incremental calculations and optimizedmemory bandwidth by reading each source pixel only once, suggestinga potential hardware implementation.