A copyright protection technique by using hybrid domains

Abstract

Nowadays, the digital image watermark techniques are still weak for resisting geometric distortions such as rotation, scaling and cropping. In this paper, robustness against cropping is achieved by the proposed two concepts. Firstly, in spatial domain, the position block is decided by edges that could differentiate the importance on the human visual system. Secondly, the verification block is used to construct the oblivious watermarking system by taking advantage of wavelet transform properties. Meanwhile, some experimental results, including the analysis of importance in different digital images and of the resistance against attacks, are presented as well.