Method calculateDifference

YUViewLib/src/video/FrameHandler.cpp:372–440

}

QImage FrameHandler::calculateDifference(FrameHandler *item2,
                                         const int,
                                         const int,
                                         QList<InfoItem> &differenceInfoList,
                                         const int        amplificationFactor,
                                         const bool       markDifference)
{
  auto width  = std::min(frameSize.width, item2->frameSize.width);
  auto height = std::min(frameSize.height, item2->frameSize.height);

  QImage diffImg(width, height, functionsGui::platformImageFormat(false));

  // Also calculate the MSE while we're at it (R,G,B)
  int64_t mseAdd[3] = {0, 0, 0};

  for (unsigned y = 0; y < height; y++)
  {
    for (unsigned x = 0; x < width; x++)
    {
      auto pixel1 = getPixelVal(x, y);
      auto pixel2 = item2->getPixelVal(x, y);

      int dR = int(qRed(pixel1)) - int(qRed(pixel2));
      int dG = int(qGreen(pixel1)) - int(qGreen(pixel2));
      int dB = int(qBlue(pixel1)) - int(qBlue(pixel2));

      int r, g, b;
      if (markDifference)
      {
        r = (dR != 0) ? 255 : 0;
        g = (dG != 0) ? 255 : 0;
        b = (dB != 0) ? 255 : 0;
      }
      else if (amplificationFactor != 1)
      {
        r = functions::clip(128 + dR * amplificationFactor, 0, 255);
        g = functions::clip(128 + dG * amplificationFactor, 0, 255);
        b = functions::clip(128 + dB * amplificationFactor, 0, 255);
      }
      else
      {
        r = functions::clip(128 + dR, 0, 255);
        g = functions::clip(128 + dG, 0, 255);
        b = functions::clip(128 + dB, 0, 255);
      }

      mseAdd[0] += dR * dR;
      mseAdd[1] += dG * dG;
      mseAdd[2] += dB * dB;

      auto val = qRgb(r, g, b);
      diffImg.setPixel(x, y, val);
    }
  }

  differenceInfoList.append(InfoItem("Difference Type", "RGB"));

  double mse[4];