Research On Robust Image Watermarking Scheme Based On IntDCT And SVD

In recent years, the popularization of computer network communication technologies has brought deep and wide communication for multimedia information such as audio signal. The process of exchange and transmission of audio data becomes oversimplified relatively; however, the complete transparency, easy manipulation of network information and various convenient signal process operation provide the chance to distribute and copy audio data without any trace, for instance, anyone can obtain others' original works via the Internet easily, some people even implement arbitrary reproduction and modification on the original works without the author's promise. These actions violate author's rights and welfare seriously. Thus, the copyright protection and integrity of audio data has become an urgent problem which cries for countermeasures. In the current copyright protection field, robust audio watermarking as one of the most effective methods has attracted many eyes of academic and business fields.This paper dedicates to research on IntDCT-based image watermarking schemes. We have got some research works shown as follows:1. the research background and significance of this topic is introduced; and the thesis analyzes the related concepts and characteristics; gives priority to robust image watermarking techniques, takes several typical schemes as example to summarize and analyze the current status of image watermarking schemes;2. It is given that the basic concept of integer discrete cosine transform (IntDCT) , basal properties, and some applications based on IntDCT; the theoretical concept for IntDCT-based image watermarking schemes is provided;3. The thesis makes use of the characteristics of integer discrete cosine transform (IntDCT)and the Huaman Visual System(HVS),originally proposes a IntDCT -domain image watermarking scheme based on chaotic sequence; Compared with traditional DCT-based watermarking scheme, the proposed algorithm is validate, the whole system is not only simple but also highly secure. 4. On the basis of analyzing the existing SVD-based watermarking scheme, a robust and efficient watermarking algorithm which is based IntDCT and SVD is proposed for copyright protection of digital images. Experimental results show that this proposed algorithm can survive attacks such as scaling, additive noise, Line removal as well as JPEG Compression.