Secure Image Authentication Scheme Using Double Random-Phase Encoding and Compressive Sensing

Figure 9

Histograms for the plain “Camera” image and the corresponding encrypted images under different compression ratios. (a) Plain “Camera” image; (b) histogram of (a); (c) encrypted image of the same size as (a); (d) histogram of (c); (e) encrypted image under ; (f) histogram of (e); (g) encrypted image under ; (h) histogram of (g); (i) encrypted image under ; (j) histogram of (i); (k) encrypted image under ; (l) histogram of (k).

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

(i)

(j)

(k)

(l)