Converting YUV into BGR or RGB in OpenCV

Question

I have a TV capture card that has a feed coming in as a YUV format. I\'ve seen other posts here similar to this question and attempted to try every possible method stated, b

Answer 1

I use the following C++ code using OpenCV to convert yuv data (YUV_NV21) to rgb image (BGR in OpenCV)

int main()
{
  const int width  = 1280;
  const int height = 800;

  std::ifstream file_in;
  file_in.open("../image_yuv_nv21_1280_800_01.raw", std::ios::binary);
  std::filebuf *p_filebuf = file_in.rdbuf();
  size_t size = p_filebuf->pubseekoff(0, std::ios::end, std::ios::in);
  p_filebuf->pubseekpos(0, std::ios::in);

  char *buf_src = new char[size];
  p_filebuf->sgetn(buf_src, size);

  cv::Mat mat_src = cv::Mat(height*1.5, width, CV_8UC1, buf_src);
  cv::Mat mat_dst = cv::Mat(height, width, CV_8UC3);

  cv::cvtColor(mat_src, mat_dst, cv::COLOR_YUV2BGR_NV21);
  cv::imwrite("yuv.png", mat_dst);

  file_in.close();
  delete []buf_src;

  return 0;
}

and the converted result is like the image yuv.png.

you can find the testing raw image from here and the whole project from my Github Project