Figure 16
From: A New Robust Watermarking Scheme to Increase Image Security
(a)–(d) The watermarked Lena, Baboon, Peppers and Crowd images with 256 × 256 watermark image after wavelet compression with quality factor 0. 4 bpp, 0.8 bpp, 1.5 bpp and 3.5 bpp, respectively. (e)–(h) The extracted watermarks (256 × 256) from (a)–(d), respectively. (a)PSNR = 35.22 dB (b)PSNR = 33.93 dB (c)PSNR = 38.17 dB (d)PSNR = 47.02 dB (e)γ = 0.5387 (f)γ = 0.7754 (g)γ = 0.9579 (h)γ = 0.9957