opencv/cxcore.go
func (img *IplImage) SetData(data unsafe.Pointer, step int) {
	C.cvSetData(unsafe.Pointer(img), data, C.int(step))
}
func (img *IplImage) SetData(data unsafe.Pointer, step int) {
	C.cvSetData(unsafe.Pointer(img), data, C.int(step))
}
/* SetData assigns user data to the image header */