Reversible Data Hiding in Encrypted Images Based on Adaptive Gradient Prediction

Figure 4

Prediction model of AGP in different locations. (a) i = 2, j = 2. (b) i = 2, 2 < j < col. (c) i = 2, j = col. (d) 2 < i < row, j = 2. (e) i = row, j = col. (f) Others.

(a)

(b)

(c)

(d)

(e)

(f)