AN IMAGE WATERMARKING ALGORITHM BASED ON DWT DCT AND SVD

With the development of network and multimedia technologies, multimedia copyright protection and content authentication have become serious problems that need to be solved urgently. Digital watermarking technology provides a strong solution for it. DWT and DCT are two most popular tools used in watermarking algorithm. With the increasing use of SVD, the digital watermarking technology in transform domain has been greatly developed. Based on DWT, DCT and SVD, we propose a new watermarking algorithm for digital image. Experimental results show that this algorithm combines the advantages of these three transforms. It can satisfy the imperceptibility and robustness very well. Furthermore, the algorithm is robust to the common image process such as JPEG compression, noise, filtering, cutting, rotation, and contrast enhance. Applying the Arnold transform to the watermark improves the robustness greatly. Compared with the SVD and the DCT+SVD algorithms, the proposed algorithm has stronger robustness and faster speed in embedding and extracting.