opencv/cxcore.go
func SubScalarWithMaskRev(value Scalar, src, dst, mask *IplImage) {
	C.cvSubRS(
		unsafe.Pointer(src),
		(C.CvScalar)(value),
		unsafe.Pointer(dst),
		unsafe.Pointer(mask),
	)
}
func SubScalarWithMaskRev(value Scalar, src, dst, mask *IplImage) {
	C.cvSubRS(
		unsafe.Pointer(src),
		(C.CvScalar)(value),
		unsafe.Pointer(dst),
		unsafe.Pointer(mask),
	)
}
// Calculates the per-element difference between a scalar and an array with a mask.
//   dst = value - src