get_hogdescriptor_visu   18 samples/cpp/train_HOG.cpp Mat get_hogdescriptor_visu(const Mat& color_origImg, vector<float>& descriptorValues, const Size & size );
get_hogdescriptor_visu  308 samples/cpp/train_HOG.cpp         imshow( "gradient", get_hogdescriptor_visu( img->clone(), descriptors, size ) );