Fragile watermarking based on secure embedding for hierarchical tampering detection and content recovery.

This paper proposed a novel fragile image watermarking scheme for tampering detection and content recovery. The watermark information for each image block consist of the authentication bits and the recovery bits. It generated the authentication bits by the information of the parity and average intensity, and generated the recovery bits from the encoded DCT coefficients, which embedded into the mapped block according to the chaotic mapping and secure embedding mechanism. On the receiver side, it used the hierarchical tampering detection, which could effectively decrease the missing and misjudgments for tampered blocks. Experimental results show that the proposed scheme can achieve better recovery performance than the reported schemes in both small and large tampered area. [ABSTRACT FROM AUTHOR]