workGroupSize     523 modules/core/include/opencv2/core/ocl.hpp     size_t workGroupSize() const;
workGroupSize    4165 modules/imgproc/src/filter.cpp             size_t kernelWorkGroupSize = k.workGroupSize();
workGroupSize    1175 modules/imgproc/src/smooth.cpp             size_t kernelWorkGroupSize = kernel.workGroupSize();