Hierarchical tiling lets sorting-based median filters on GPUs reach O(k log k) and O(k) per-pixel complexity for k x k kernels, with large measured speedups.
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A Fast Parallel Median Filtering Algorithm Using Hierarchical Tiling
Hierarchical tiling lets sorting-based median filters on GPUs reach O(k log k) and O(k) per-pixel complexity for k x k kernels, with large measured speedups.