Digital image watermarking method based on DCT and fractal encoding. Issue 10 (1st October 2017)

• Record Type: Journal Article
• Authors: Liu, Shuai; Pan, Zheng; Song, Houbing
• Is Part Of: IET image processing. Volume 11:Issue 10(2017)
• Page Start: 815
• Page End: 821
• Publication Date: 2017-10-01
• Subjects: discrete cosine transforms -- image watermarking -- image coding -- fractals -- cryptography; digital image watermarking method -- digital product copyright dispute -- digital product piracy dispute -- fractal encoding method -- discrete cosine transform -- DCT method -- double encryption -- private image encoding -- private image extraction -- carrier image -- private encoding scales; Image processing -- Periodicals; 621.36705
• DOI: 10.1049/iet-ipr.2016.0862
• Languages: English
• ISSNs: 1751-9659

Abstract

Abstract : With the rapid development of computer science, problems with digital products piracy and copyright dispute become more serious; therefore, it is an urgent task to find solutions for these problems. In this study, the authors' develop a digital watermarking algorithm based on a fractal encoding method and the discrete cosine transform (DCT). The proposed method combines fractal encoding method and DCT method for double encryptions to improve traditional DCT method. The image is encoded by fractal encoding as the first encryption, and then encoded parameters are used in DCT method as the second encryption. First, the fractal encoding method is adopted to encode a private image with private scales. Encoding parameters are applied as digital watermarking. Then, digital watermarking is added to the original image to reversibly using DCT, which means the authors can extract the private image from the carrier image with private encoding scales. Finally, attacking experiments are carried out on the carrier image by using several attacking methods. Experimental results show that the presented method has higher performance characteristics such as robustness and peak signal to noise ratio than classical methods.