Figure 3.18 shows 2-D scatter data obtained by plotting two neighboring pixels x f (i, j) and y f (i 1, j)

Figure 3.18 shows 2-D scatter data obtained by plotting two neighboring pixels x ¼ f (i, j) and y ¼ f (i þ 1, j) of the LENA image. The estimated covariance matrix of this data set is

R = [0.2529 [0.2512 0.2512 0.2525