Cool paper from @sigfpe which generalizes the familiar prefix sum/summed area table technique for fast box filters to arbitrary polygons:https://www.researchgate.net/publication/269699690_Fast_and_Exact_Convolution_with_Polygonal_Filters …
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It's better than those matrix multiplication algorithms where you need a matrix the size of a planet to beat Strassen.
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Caring about constants is such an applied mathematician thing to do!
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