use double precision gaussian blur if sigma >= 25, #4928
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@@ -1143,7 +1143,7 @@ template<class T> void gaussianBlurImpl(T** src, T** dst, const int W, const int
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{
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static constexpr auto GAUSS_SKIP = 0.25;
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static constexpr auto GAUSS_3X3_LIMIT = 0.6;
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static constexpr auto GAUSS_DOUBLE = 70.0;
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static constexpr auto GAUSS_DOUBLE = 25.0;
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if(buffer) {
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// special variant for very large sigma, currently only used by retinex algorithm
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