convertYUV420toImageColor function

Image convertYUV420toImageColor(CameraImage image)

Converts CameraImage in YUV format to BGR Image.

Implementation

imglib.Image convertYUV420toImageColor(CameraImage image) {
  final int width = image.width;
  final int height = image.height;
  final int uvRowStride = image.planes[1].bytesPerRow;
  final int uvPixelStride = image.planes[1].bytesPerPixel!;

  imglib.Image img = imglib.Image(width: width, height: height); // Create Image buffer

  // Fill image buffer with plane[0] from YUV420_888
  for (int x = 0; x < width; x++) {
    for (int y = 0; y < height; y++) {
      final int uvIndex = uvPixelStride * (x / 2).floor() + uvRowStride * (y / 2).floor();
      final int index = y * width + x;

      final yp = image.planes[0].bytes[index];
      final up = image.planes[1].bytes[uvIndex];
      final vp = image.planes[2].bytes[uvIndex];

      // Calculate pixel color
      int r = (yp + vp * 1436 / 1024 - 179).round().clamp(0, 255);
      int g = (yp - up * 46549 / 131072 + 44 - vp * 93604 / 131072 + 91).round().clamp(0, 255);
      int b = (yp + up * 1814 / 1024 - 227).round().clamp(0, 255);

      img.setPixelRgb(x, y, r, g, b);
    }
  }

  return img;
}