Imperceptible Watermarking Technique using Arnold's Transform and Cross Chaos Map in DCT Domain

Digital watermarking is the process of embedding secret information into a digital signal which may be used to verify its authenticity or the identity of its owners. In this paper, we have taken image as the medium of watermarking. Here, we have discussed an imperceptible watermarking technique by using double encryptions in DCT domain. For the encryption process, Arnold's transform and Cross chaos map are used. Like other algorithms, this one is also evaluated by Peak signal to noise ratio (PSNR). From the experimental results, it can be proved that this algorithm gives better PSNR value, which makes the algorithm to imperceptible.