A feature-watermarking scheme for JPEG image authentication
Feature-based watermark is a special kind of watermark, which reflects the features of the content, and these features are deliberately chosen in the way that they will keep invariant during "content preserving" modifications while being sensitive to "malicious" attacks. In this paper, a novel approach to content authentication for JPEG images is proposed. The image authentication method is based on partial energy relation between groups of 8x8 DCT blocks as features, while the strategies of watermark embedding and extraction is based on improved DEW algorithm. Our proposed scheme has the capability of differentiating "content preserving" modifications from "malicious" attacks and so can ascertain and locate the "malicious" attacks. Experimental results show the feasibility of the proposed scheme.