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Discontinuity-preserving Normal Integration with Auxiliary Edges

Hyomin Kim · Yucheol Jung · Seungyong Lee

Arch 4A-E Poster #222
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Thu 20 Jun 10:30 a.m. PDT — noon PDT


Many surface reconstruction methods incorporate normal integration, which is a process to obtain a depth map from surface gradients. In this process, the input may represent a surface with discontinuities, e.g., due to self-occlusion. To reconstruct an accurate depth map from the input normal map, hidden surface gradients occurring from the jumps must be handled. To model these jumps correctly, we design a novel discretization for the domain of normal integration. Our key idea is to introduce auxiliary edges, which bridge between piecewise-smooth planes in the domain so that the magnitude of hidden jumps can be explicitly expressed on finite elements. Using the auxiliary edges, we design a novel algorithm to optimize the discontinuity and the depth map from the input normal map. Our method optimizes discontinuities by using a combination of iterative re-weighted least squares and iterative filtering of the jump magnitudes on auxiliary edges to provide strong sparsity regularization. Compared to previous discontinuity-preserving normal integration methods, which model the magnitude of jumps only implicitly, our method reconstructs subtle discontinuities accurately thanks to our explicit representation allowing for strong sparsity regularization.

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