A Robust Watermarking Scheme for Online Multimedia Copyright Protection Using New Chaotic Map

Figure 10

(a) Watermark cameraman image; (b) watermark cameraman image after discarding 4 Least Significant Bits (LSBs) of each pixel. It can be seen that there is not much difference of texture between these two images (a and b). (c) Substituted version of watermark by substituting the after-discarded version of watermark with the S-Box shown in Table 2. Although the information is visually available in substituted image, it still provides better security as compared to (b).

(a)

(b)

(c)