calcBackProject  1876 modules/imgproc/src/histogram.cpp void cv::calcBackProject( const Mat* images, int nimages, const int* channels,
calcBackProject  2039 modules/imgproc/src/histogram.cpp void cv::calcBackProject( const Mat* images, int nimages, const int* channels,
calcBackProject  2217 modules/imgproc/src/histogram.cpp void cv::calcBackProject( InputArrayOfArrays images, const std::vector<int>& channels,