Print OpenCV single channel Mat

printOpenCVMat.cpp

void _PrintMatrix(char *pMessage, cv::Mat &mat)
{
	printf("%s\n", pMessage);

	for (int r = 0; r < mat.rows; r++) {
		for (int c = 0; c < mat.cols; c++) {

			switch (mat.depth())
			{
			case CV_8U:
			{
				printf("%*u ", 3, mat.at<uchar>(r, c));
				break;
			}
			case CV_8S:
			{
				printf("%*hhd ", 4, mat.at<schar>(r, c));
				break;
			}
			case CV_16U:
			{
				printf("%*hu ", 5, mat.at<ushort>(r, c));
				break;
			}
			case CV_16S:
			{
				printf("%*hd ", 6, mat.at<short>(r, c));
				break;
			}			
			case CV_32S:
			{
				printf("%*d ", 6, mat.at<int>(r, c));
				break;
			}
			case CV_32F:
			{
				printf("%*.4f ", 10, mat.at<float>(r, c));
				break;
			}
			case CV_64F:
			{
				printf("%*.4f ", 10, mat.at<double>(r, c));
				break;
			}
			}			
		} printf("\n");
	} printf("\n");
}

int main(void){
  
	Mat a = Mat(3, 3, CV_8U, Scalar(255));
	_PrintMatrix("CV_8U", a);

	a = Mat(3, 3, CV_8S, Scalar(-127));
	_PrintMatrix("CV_8S", a);

	a = Mat(3, 3, CV_16U, Scalar(65535));
	_PrintMatrix("CV_16U", a);

	a = Mat(3, 3, CV_16S, Scalar(-32768));
	_PrintMatrix("CV_16S", a);

	a = Mat::eye(3, 3, CV_32S);
	_PrintMatrix("CV_32S", a);

	a = Mat::eye(3, 3, CV_32F);
	_PrintMatrix("CV_32F", a);

	a = Mat::eye(3, 3, CV_64F);
	_PrintMatrix("CV_64F", a);
  
  return 0;
}