region method

Mat region(Rect rect)

https://docs.opencv.org/4.x/d3/d63/classcv_1_1Mat.html#aa7ec97373406215f2d4bc72cc1d27036

Implementation

Mat region(Rect rect) {
  cvAssert(rect.right <= width && rect.bottom <= height);
  final p = calloc<cvg.Mat>();
  cvRun(() => cffi.Mat_Region(ref, rect.ref, p));
  final dst = Mat._(p);
  return dst;
}