A Blind Watermarking Technology Based on DCT Domain

As a new information hiding technology, digital watermarking attracted more and more attention in copyright protection. This paper proposed a DCT domain blind watermarking algorithm based on Arnold and quantification. Firstly we conduct Arnold chaotic scrambling to the watermarking before the embedding, to reduce the correlation between pixels and improve the security of the watermarking, then according to the bit values of watermarking which to be embedded, using different methods to quantize the frequency coefficient of each sub-block, and then based on the coefficient characteristics of embedding watermarking to extract the watermarking, in which the watermarking extraction process does not require the original image so that achieved the blind extraction. Numbers of experiments show that the algorithm has good robustness and transparency in cope with common attacks.