An Image Authentication Scheme Based on Chaotic Maps

Abstract

Watermark is a method to protect the intellectual property rights of digital media. The production of multimedia content has increased in recent years, and the protection of copyright has put forward high requirements. Different watermarking methods are proposed to satisfy the trade-off between imperceptibility while maintaining appropriate embedded data capacity. In general, the transform domain watermarking, such as wavelet-based methods; yields better results than spatial algorithms. Therefore, this paper introduces a new measure. A block and content based localization and restoration image authentication scheme is proposed. In this scheme, the watermark of each block is an encrypted form of its content features embedded in another block selected by the ergodic matrix of chaotic sequences. Experiments show that this scheme can detect and locate any tampering of 8X8 pixels and above, and can restore 40% of the damaged to understandable images.