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

Figure 4

(a) Secret grayscale image with 256 × 256 pixels of Barbara, (b) the corresponding phase key generated by PRA, and (c) retrieved image with correct decryption parameters (𝑆=3,𝜆=632.8nm,𝑚=3,𝑓=4cm,𝑝=0.3,𝛼=0.7).

(a)

(b)

(c)