opencv/cxcore.go
func (img *IplImage) Set2D(x, y int, value Scalar) {
	C.cvSet2D(unsafe.Pointer(img), C.int(y), C.int(x), (C.CvScalar)(value))
}
func (img *IplImage) Set2D(x, y int, value Scalar) {
	C.cvSet2D(unsafe.Pointer(img), C.int(y), C.int(x), (C.CvScalar)(value))
}
/* Set2D sets a particular element in the image */