Binary Image Based On Wavelet Transform

With the development of multimedia and network techniques, the Copyright Protection of digital media is becoming more and more important. How to ensure the security of digital media has become the focus of research work all over the world. As a new method of Copyright Protection, digital watermarking techniques has attracted more and more attention result are obtained. However, the technique research aiming at binary images is limited.Because of the characteristic of binary images itself,the binary images watermarking have big difference to the common watermarking,the data hiding methods which is used in gray image and color image is hard to be used in binary images.In practice, there are o lot of binary image such as black-white-photo,document,signature,contract,seal. So it's an important research direction for their copyright protection in digital watermarking domain. Most of now available binary watermark algorithm are based spatial domain, there embedded information are limited and the operation process is complicated. For the conflict between robustness and imperceptibility during embedding, a new water- marking technique: non-watermarking is introduced. Non-watermarking utilizes the feature of the original works to construct a watermark, but does not modify.This paper first reviews background of subject and the current development condition, point out the technology of binary image watermark, sums up the types of watermark technology, analyzes the image watermark's advantage and shortcoming of spatial and frequency domain and proposes a appropriate target of watermarking system and it's computed method. A robustness algorithm is given which are based on DWT domain. This Algorithm has good ability to resist geometric and noise attacks. Without original image the watermarking can be extracted ,so it is a practical blind watermarking. First, Binaries the coefficient of the image that is wavelet transformed. Second, we use the high frequency part add to the watermark-image that disordered, so we obtain a logical array to protect copyright. The experiment result shows that the algorithm is simple and increased the information embedded and has better robustness and concealment. It is consequently known to us that the method brought forward in this paper has certain value of theory and application, under the wish to bring some novel thought for development of binary digital watermarking.