opencv/cxcore.go
func (m *Mat) Set2D(x, y int, value Scalar) {
	C.cvSet2D(unsafe.Pointer(m), C.int(x), C.int(y), (C.CvScalar)(value))
}
func (m *Mat) Set2D(x, y int, value Scalar) {
	C.cvSet2D(unsafe.Pointer(m), C.int(x), C.int(y), (C.CvScalar)(value))
}
/* Set2D sets a particular element in them matrix */