Figure 26
From: A New Robust Watermarking Scheme to Increase Image Security
(a) and (b) The watermarked Lena and Peppers images after changing aspect ratio attack (X =1, Y = 1.2), respectively. (c) and (d) the watermarked Baboon and Crowd images after changing aspect ratio attack (X = 0.8, Y = 1), respectively. (e)–(h) The extracted watermarks from (a)–(d), respectively. (a)PSNR = 27.50 dB (b)PSNR = 26.49 dB (c)PSNR = 24.45 dB (d)PSNR = 26.36 dB (e)γ = 0.6733 (f)γ = 0.5809 (g)γ = 0.6440 (h)γ = 0.5666