opencv/cxcore.go
func (m *Mat) Get2D(x, y int) Scalar {
	ret := C.cvGet2D(unsafe.Pointer(m), C.int(x), C.int(y))
	return Scalar(ret)
}
func (m *Mat) Get2D(x, y int) Scalar {
	ret := C.cvGet2D(unsafe.Pointer(m), C.int(x), C.int(y))
	return Scalar(ret)
}
/* Get2D return a specific element from a 2-dimensional matrix. */