compute method

Scalar compute(Mat cmp)

Compute the PSNR.

https://docs.opencv.org/4.x/d8/d0c/classcv_1_1quality_1_1QualityPSNR.html#a4c08dcc4944fa7ae2bd9dc00607c3f1a

Implementation

Scalar compute(Mat cmp) {
  final p = calloc<cvg.Scalar>();
  cvRun(() => cffi.QualityPSNR_compute(ref, cmp.ref, p));
  return Scalar.fromPointer(p);
}