Fractional Directional Differentiation and Its Application for Multiscale Texture Enhancement

Table 3

Information entropy and average gradient in Figure 7.

Quantity figure	Information entropy	Average gradient
(a)	7.1169	12.7524
(b)	7.0527	18.5745
(c)	7.5542	24.2284
(d)	7.7479	21.3413
(e)	6.7022	8.1590
(f)	6.5945	9.9940
(g)	6.9191	14.3697
(h)	7.0042	12.3686
(i)	7.0699	20.1335
(j)	6.7949	21.9897
(k)	7.2170	31.1642
(l)	7.7158	28.0974
(m)	7.0124	4.7013
(n)	6.5731	4.9414
(o)	7.1646	7.1624
(P)	7.4953	5.5328