Dianxin kexue (Feb 2017)
Bifunctional watermarking for copyright protection and content authentication with perfectly blind detection
Abstract
In view of the limitation that most of the watermarking algorithms are single in functions and unable to achieve perfectly blind detection,a bifunctional watermarking algorithm with perfectly blind detection for copyright protection and content authentication was proposed.The algorithm adopted the idea of region segmentation for sub-block,and the generation and embedding of watermark were respectively carried out in the different regions of the same sub-block.A feature watermark was generated by judging the parity of the first digit from the average of maximum singular values,and the watermark was embedded by adjusting two DCT coefficients of adjacent blocks in the same position.Both the image copyright protection and content authentication functions were achieved by comparing the generated feature watermark and blindly extracting authentication watermark in the detection.Compared to some of the reported watermarking schemes,the proposed algorithm not only has better robustness against the common attacks to realize the copyright protection,but also has a good sensitivity to malicious image tampering to accurately locate the tampered area.
