A Fragile Watermarking Scheme For Tamper Detection and Recovery of Image

Abstract

A fragile, block-wise, and content-based watermarking scheme for tamper detection and recovery of image is presented. In the scheme, an image is divided into four quadrants firstly. Then correlation groups are set up after some blocks (each size is 8times8) in different two quadrants being matched. Correlative matrix can be got after the blocks of each group correlation operation being processed. This kind of operation is reversible. The watermark which is embedded into the LSB of each block A includes the signature of the block B and a part of correlative matrix of the two blocks B. The block A and block B should be in relatively long distance in image. The advantage of the scheme is that the tamper content is recovered by untampered content. The experimental results show that our scheme can be applied in detecting and localizing any tampering of equal or more than the size of 8times8 pixels. The recovery of the tampered image is better than that of the scheme of Fridrich et al. (1999)