message: Fix UIImageToMat method by taking image scale information into account
diff: @@ -97,7 +97,7 @@ UIImage* MatToUIImage(const cv::Mat& image) {
  void UIImageToMat(const UIImage* image,
  cv::Mat& m, bool alphaExist) {
  CGColorSpaceRef colorSpace = CGImageGetColorSpace(image.CGImage);
  - CGFloat cols = image.size.width, rows = image.size.height;
  + CGFloat cols = CGImageGetWidth(image.CGImage), rows = CGImageGetHeight(image.CGImage);
  CGContextRef contextRef;
  CGBitmapInfo bitmapInfo = kCGImageAlphaPremultipliedLast;
  if (CGColorSpaceGetModel(colorSpace) == kCGColorSpaceModelMonochrome)
  