Dump OpenCV Mat to file

dump.cpp

static std::string type2str(int type) {
  std::string r;

  uchar depth = type & CV_MAT_DEPTH_MASK;
  uchar chans = 1 + (type >> CV_CN_SHIFT);

  switch ( depth ) {
    case CV_8U:  r = "8U"; break;
    case CV_8S:  r = "8S"; break;
    case CV_16U: r = "16U"; break;
    case CV_16S: r = "16S"; break;
    case CV_32S: r = "32S"; break;
    case CV_32F: r = "32F"; break;
    case CV_64F: r = "64F"; break;
    default:     r = "User"; break;
  }

  r += "C";
  r += (chans+'0');

  return r;
}

static void dumpMat(Mat m, std::string dir, std::string prefix) {
    ostringstream osFileName;
    osFileName << dir << "/" << prefix << "_" << + m.rows << "x" << m.cols << "_" << type2str(m.type()) << ".bin";
    string fileName = osFileName.str();
    ofstream outfile;
    outfile.open(fileName);
    outfile.write((char*)m.data, m.total() * m.elemSize());
    outfile.close();
}