func GetSizeWidth(img *IplImage) int {
	size := C.cvGetSize(unsafe.Pointer(img))
	w := int(size.width)
	return w
}
func GetSizeWidth(img *IplImage) int {
	size := C.cvGetSize(unsafe.Pointer(img))
	w := int(size.width)
	return w
}
/******** matrix iterator: used for n-ary operations on dense arrays *********/
// P290
/* Returns width and height of array in elements */