+ = 1 0 1 0 2 (2 1) , cos 2 (2 1) , cos N x N y N y v f x y N x u C u v u v ƒÎ ƒÎ ƒ¿ ƒ¿ , (6) for uv N , 0,1,2, , 1 = c | . This property, known as separability, has the principle advantage that C(u, v) can be computed in two steps by successive 1-D operations on rows and columns of an image. This idea is graphically illustrated in Figure 8. The arguments presented can be identically applied for the inverse DCT computation (5).
