convertTo method
converts matrix to another datatype with optional scaling.
Implementation
UMat convertTo(MatType type, {UMat? dst, double alpha = 1, double beta = 0}) {
dst ??= UMat.empty();
cvRun(() => ccore.cv_UMat_convertTo(ref, type.value, alpha, beta, dst!.ref, ffi.nullptr));
return dst;
}