Figure 27From: A New Robust Watermarking Scheme to Increase Image Security(a)–(d) The watermarked Lena, Baboon, Peppers and Crowd images after tampering, respectively. (e)–(h) The extracted watermarks from (a)–(d), respectively. (i)–(l) The watermarked Lena, Baboon, Peppers and Crowd images after data blocks removal, respectively. (m)–(p) The extracted watermarks from (i)–(l), respectively. (a)PSNR = 15.35 dB (b)PSNR = 19.59 dB (c)PSNR = 16.37 dB (d)PSNR = 18.46 dB (e)γ = 0.7167 (f)γ = 0.9090 (g)γ = 0.7598 (h)γ = 0.8415 (i)PSNR = 15.33 dB (j)PSNR = 14.49 dB (k)PSNR = 15.87 dB (l)PSNR = 14.63 dB (m)γ = 0.7698 (n)γ = 0.7702 (o)γ = 0.7816 (p)γ = 0.6724Back to article page