Nonlinear Multi-Image Encryption Scheme with the Reality-Preserving Discrete Fractional Angular Transform and DNA Sequences

Figure 3

Histograms for three test groups’ images: (a) “Peppers,” (b) “House,” (c) “Elaine,” (d) “Bridge,” (e) “Baboon,” (f) “Lax,” (g) “Woman,” (h) “Barbara,” (i) “Couple,” (j) “Airfield,” (k) “Flower,” and (l) “Lake”.

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

(i)

(j)

(k)

(l)