Visual Cryptography from Halftone Error Diffusion - Visual Cryptography and Secret Image Sharing - page 22

(a) (b)

(c) (d)

FIGURE 1.10
(a){(c) Shares of the 3-out-of-3 scheme using the rst method, q = 9. The
perceived errors are 1:73 10 10 , 8:45 10 9 , and 5:46 10 9 , respectively. (d)
Decoded image by shares (a)-(c), = 1=9. (Reprinted with permission from
IEEE Trans. Inf. Forensics Security, vol. 4, no. 3, pp. 383{396, Sep. 2009
c IEEE 2009).