컬러공간 변환

BGR >> GRAY

// BGR -> GRAY

Mat ColorToGray(Mat& src)

{

Mat gray;

assert(src.type() != CV_8UC3);

vector<Mat> channels;

split(src,channels);

gray = (0.333 * channels[0]) + (0.333 * channels[1]) + (0.333 * channels[2]);

return gray;

}