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Merge pull request #29253 from ssam18:fix-29222-bgr2lab-first-call

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Speed up first BGR2Lab and BGR2Luv call by building the color LUT faster
This commit is contained in:
Alexander Smorkalov
2026-06-08 13:40:02 +03:00
committed by GitHub
parent ab1aaa75aa c936dcaef7
commit 21356eed2b
1 changed files with 12 additions and 8 deletions
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modules/imgproc/src/color_lab.cpp
+12 -8
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@@ -1160,20 +1160,23 @@ static LABLUVLUT_s16_t initLUTforLABLUVs16(const softfloat & un, const softfloat
AutoBuffer<int16_t> RGB2Labprev(LAB_LUT_DIM*LAB_LUT_DIM*LAB_LUT_DIM*3);
AutoBuffer<int16_t> RGB2Luvprev(LAB_LUT_DIM*LAB_LUT_DIM*LAB_LUT_DIM*3);
for(int p = 0; p < LAB_LUT_DIM; p++)
softfloat gammaTab[LAB_LUT_DIM];
for(int n = 0; n < LAB_LUT_DIM; n++)
gammaTab[n] = applyGamma(softfloat(n)/lld);
cv::parallel_for_(cv::Range(0, LAB_LUT_DIM), [&](const cv::Range& prange)
{
for(int p = prange.start; p < prange.end; p++)
{
for(int q = 0; q < LAB_LUT_DIM; q++)
{
for(int r = 0; r < LAB_LUT_DIM; r++)
{
int idx = p*3 + q*LAB_LUT_DIM*3 + r*LAB_LUT_DIM*LAB_LUT_DIM*3;
softfloat R = softfloat(p)/lld;
softfloat G = softfloat(q)/lld;
softfloat B = softfloat(r)/lld;
R = applyGamma(R);
G = applyGamma(G);
B = applyGamma(B);
softfloat R = gammaTab[p];
softfloat G = gammaTab[q];
softfloat B = gammaTab[r];
//RGB 2 Lab LUT building
{
@@ -1214,6 +1217,7 @@ static LABLUVLUT_s16_t initLUTforLABLUVs16(const softfloat & un, const softfloat
}
}
}
});
int16_t *RGB2LabLUT_s16 = cv::allocSingleton<int16_t>(LAB_LUT_DIM*LAB_LUT_DIM*LAB_LUT_DIM*3*8);
int16_t *RGB2LuvLUT_s16 = cv::allocSingleton<int16_t>(LAB_LUT_DIM*LAB_LUT_DIM*LAB_LUT_DIM*3*8);