179693.fig.003a
(a) Original image
179693.fig.003b
(b) One-level decomposition
179693.fig.003c
(c) Coded image
179693.fig.003d
(d) Reconstructed image
Figure 3: Test image 1 (Lena.PGM) when 𝑥 ( 1 ) = 0 . 1 2 3 4 5 , 𝛼 = 4 , key1 = 1234567890223344, and key2 = 0987654321001122, Thr = 30, PSNR = 28.1240.