An Enhanced Informed Watermarking Scheme Using the Posterior Hidden Markov Model

Figure 6

Illustration of the images watermarked by the PriHIW, PostHIW, and TIW. (a) Tank (PSNR = 35.39 dB, 𝐷^Pri_DWT = 13.81). (b) Lena (PSNR = 33.35 dB, 𝐷^Pri_DWT = 20.88). (c) Voit (PSNR = 33.11 dB, 𝐷^Pri_DWT = 21.81). (d) Tank (PSNR = 34.98 dB, 𝐷^Post_DWT = 13.81). (e) Lena (PSNR = 33.60 dB, 𝐷^Post_DWT = 20.90). (f) Voit (PSNR = 33.42 dB, 𝐷^Post_DWT = 21.83). (g) Tank (PSNR = 35.60 dB, 𝐷^TIW_DWT = 13.81). (h) Lena (PSNR = 33.81 dB, 𝐷^TIW_DWT = 20.90). (i) Voit (PSNR = 34.31 dB, 𝐷^TIW_DWT = 21.81).

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