Devil’s Vortex Phase Structure as Frequency Plane Mask for Image Encryption Using the Fractional Mellin Transform

Figure 7

Impact of occlusion attack on decryption phase key. (a)Without occlusion, (b) 25% occlusion, (c) 50% occlusion, (d) 75% occlusion, and (e)–(h) corresponding retrieved images.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)