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Multigrid and multilevel preconditioners for computational photography
2011
ACM Transactions on Graphics
Figure 1 : Colorization using a variety of multilevel techniques: (a) input gray image with color strokes overlaid; (b) "gold" (final) solution; (c) after one iteration of adaptive basis preconditioners (ABF) with partial sparsification; (d) after one iteration of regular coarsening algebraic multigrid (AMG) with Jacobi smoothing and (e) with four-color smoothing. The computational cost for the ABF approach is less than half of the AMG variants and the error with respect to the gold solution is
doi:10.1145/2070781.2024211
fatcat:qccdldsp25erhbsd6mqgtytdnq