Variable block-size image authentication with localization and self-recovery

In this paper, a self-recovery image authentication technique is proposed using randomly-sized blocks. To dived an image into randomly-sized blocks, it undergoes recursive arbitrarily-asymmetric quad tree partitioning. Multiple description coding (MDC) that enhances reliability of altered block recovery, is utilized to generate two block descriptions. We propose the use of a chain with multiple links for embedding several signature copies and two descriptions per block in arbitrarily distant blocks. The experimental results deposit that the proposed technique successfully both localizes and compensates the alterations. Furthermore, it is robust against the vector quantization (VQ) attack.