Histogram Modification and Wavelet Transform for High Performance Watermarking
Figure 7
Test images: (a) Lena, (b) Baboon, (c) Barbara, (d) Boat, (e) Board, and (f) Peppers. The six watermarked images obtained by our scheme and Zhao et al.’s method are shown in Figures 8–13. Note that all of the bits of the watermarks embedded inside are “1” which leads to a maximum distortion. All these results demonstrate not only the capacities but also the PSNRs in our method which are improved. In other words, even though more secret data embedded in our scheme and leads more distortion, the marked images quality is still better.
