Multiple Blind Watermark Algorithm Based on Wavelet Packet Transform and Two-dimensional Chaos Scramble

摘要

The users need to embed multiple watermarks simultaneously in one host image for information hiding and integrity verification. Furthermore, for the convenience of the users, the watermarks must be distilled blindly. In this paper, multiple blind watermark algorithm based on wavelet packet transform (WPT) and two-dimensional chaos image scramble is put forward. In the sub-images of WPT, multiple watermarks are embedded and distilled blindly. Meantime, the image contrast enhancement to hidden information before hand can improve its robustness effectively. In order to improve the security, twodimensional chaos image scramble algorithm is designed. Experimental results show that the multiple blind watermark algorithm has good invisibleness, security and robustness to common image processing and noise attack.