A Blind Watermark Algorithm in Mixed Transform Domain Based on Chaotic Sequence Locating

This paper presents a blind watermark algorithm in mixed transform domain by using chaotic sequence for the watermark locating. After DWT, the DCT is applied on the low frequency and chaotic sequence is used to locate the position of the watermark information in DCT domain. The watermark information is embedded by comparing the frequency coefficients. With favorable transparency, the experimental results show that the algorithm has a good robustness against noise, image processing, malicious attacks and image compression. The adoption of chaotic sequences enhances the security capability.