Figure 9

The visual quality comparison of close-ups for Lena and Tiffany images after JPEG 2000 compression. (a), (g) are watermarked images by method [18]. (b), (h) are watermarked images by method [12]. (c), (i) are watermarked images by the ACOCOA technique. (d), (j) are watermarked images by method [18] after JPEG 2000 compression. (e), (k) are watermarked images by method [12] after JPEG 2000 compression. (f), (l) are watermarked images by the ACOCOA technique after JPEG 2000 compression.