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Merge pull request #7538 from Tetragramm:CLAHEfix

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This commit is contained in:
Vadim Pisarevsky 2016-11-29 16:42:04 +00:00
commit c47267ef7f
2 changed files with 13 additions and 6 deletions
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14
modules/imgproc/src/clahe.cpp
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@ -212,8 +212,12 @@ namespace
for (int i = 0; i < histSize; ++i)
tileHist[i] += redistBatch;
for (int i = 0; i < residual; ++i)
tileHist[i]++;
if (residual != 0)
{
int residualStep = MAX(histSize / residual, 1);
for (int i = 0; i < histSize && residual > 0; i += residualStep, residual--)
tileHist[i]++;
}
}
// calc Lut
@ -359,7 +363,7 @@ namespace
bool useOpenCL = cv::ocl::useOpenCL() && _src.isUMat() && _src.dims()<=2 && _src.type() == CV_8UC1;
#endif
int histSize = _src.type() == CV_8UC1 ? 256 : 4096;
int histSize = _src.type() == CV_8UC1 ? 256 : 65536;
cv::Size tileSize;
cv::_InputArray _srcForLut;
@ -416,7 +420,7 @@ namespace
if (_src.type() == CV_8UC1)
calcLutBody = cv::makePtr<CLAHE_CalcLut_Body<uchar, 256, 0> >(srcForLut, lut_, tileSize, tilesX_, clipLimit, lutScale);
else if (_src.type() == CV_16UC1)
calcLutBody = cv::makePtr<CLAHE_CalcLut_Body<ushort, 4096, 4> >(srcForLut, lut_, tileSize, tilesX_, clipLimit, lutScale);
calcLutBody = cv::makePtr<CLAHE_CalcLut_Body<ushort, 65536, 0> >(srcForLut, lut_, tileSize, tilesX_, clipLimit, lutScale);
else
CV_Error( CV_StsBadArg, "Unsupported type" );
@ -426,7 +430,7 @@ namespace
if (_src.type() == CV_8UC1)
interpolationBody = cv::makePtr<CLAHE_Interpolation_Body<uchar, 0> >(src, dst, lut_, tileSize, tilesX_, tilesY_);
else if (_src.type() == CV_16UC1)
interpolationBody = cv::makePtr<CLAHE_Interpolation_Body<ushort, 4> >(src, dst, lut_, tileSize, tilesX_, tilesY_);
interpolationBody = cv::makePtr<CLAHE_Interpolation_Body<ushort, 0> >(src, dst, lut_, tileSize, tilesX_, tilesY_);
cv::parallel_for_(cv::Range(0, src.rows), *interpolationBody);
}

5
modules/imgproc/src/opencl/clahe.cl
View File

@ -201,7 +201,10 @@ __kernel void calcLut(__global __const uchar * src, const int srcStep,
tHistVal += redistBatch;
int residual = totalClipped - redistBatch * 256;
if (tid < residual)
int rStep = 256 / residual;
if (rStep < 1)
rStep = 1;
if (tid%rStep == 0 && (tid/rStep)<residual)
++tHistVal;
}