Data-Hiding Scheme Using Multidirectional Pixel-Value Differencing on Colour Images

Figure 3

Three pairs in three directions. (a) Case 1: minimum value position (0, 0). (b) Case 2: minimum value position (0, 1). (c) Case 3: minimum value position (1, 0). (d) Case 1: minimum value position (1, 1).

(a)

(b)

(c)

(d)