A Research On Digital Watermarking Algorithm Based On Text Image

Digital watermarking as an effective digital copyright protection technology, is a cutting-edge topic in the field of the international information security nowadays. With the success of the Internet, there are many creative ways to text storage and transmission, text as a means of information transmission, significantly overpasses the application of the image, video and audio .Meanwhile , the protection methods of text digital watermarking has also being playing a very important role in government offices and e-commerce. So it is quite important to study text digital watermarking technology and it also has an important practical significance.This paper takes the text image as research object, first of all ,it just gives a brief introduction about the basic theory of digital watermarking technology and the text digital watermarking, on the basis ,the paper makes a detailed study on several typical text digital watermarking algorithm, and in DCT domain, DWT and DCT domain -DWT domain achieves three non-visible watermark improving algorithm, at the same time, it puts forward a kind of visible text Watermarking Algorithm based on Wavelet domain:1,As for the non-visible watermarking algorithm, this paper achieves the three algorithms algorithm in the DCT domain, DWT domain and the combination of DCT-DWT domain space based on the respective advantages and disadvantages of the frequency-domain and combined with chaotic dynamical systems, and analyzes their respective function. Then it verifies feasibility of improving algorithm through some common image processing and attacking experiment.2,As for the text visible watermarking algorithm, first of all, this paper introduces the meaning and the development of visible watermarking research and illustrates nature and requirements of visible watermarking from the perspective of the application of a watermark; then studies the according to Harris feature points and typical algorithm of visible watermarking Finally, put forward a kind of visible text digital watermarking algorithm based on wavelet domain. The experiment shows that this algorithm can guarantee the quality of image and the security of watermarking. And it is quite practical in the copyright protection.Finally, the author just concludes the full text and put forward future direction of the text digital watermarking technology.