Discrete Wavelet Transform Based Digital Watermarking Of Color Images

With the popularity of the Internet and multimedia technology development, access toinformation has become extremely convenient, but the infringement of the creators of digitalproducts also will be easier. How effective copyright protection of digital products becomeimportant issues facing the field of information security. To this end, the digital watermarkingtechnology as a digital product copyright protection, authentication, a way to hide thetelecommunications and other areas, causing a great deal of interest and concern. Relativebinary watermark for color images, grayscale image watermark with an intuitive, rich, vivid,including copyright-protected information capacity, more likely to be of human visualrecognition, etc. In this paper, the color image watermarking based on discrete wavelettransform, the main work and conclusions are as follows.(1) First of all, made a comprehensive introduction to the basic principles of imagewatermarking techniques, basic knowledge and research status. Then introduced and analyzedbased on discrete wavelet transform digital watermarking, the analysis showed that the digitalwatermarking algorithm based on discrete wavelet transform attacks such as JPEGcompression, noise, clipping and filtering with good robustness.(2) Digital watermarking algorithm for two-color image, concrete steps andimplementation process. Existing watermarking algorithm in principle there are manysimilarities, common problems in the different algorithms intrinsically linked to refine theanalysis of a large information capacity watermark embedded watermark is not visible,robustness reduced on the basis of the algorithm combines the characteristics of the colorimage, according to the characteristics of the HVS (human visual System), under the premiseto meet the human visual perception to determine the good robustness suitable for embeddedwavelet basis, the weight coefficient.(3) Programming to achieve a color image watermarking based on discrete wavelettransform algorithm, and validated through experiments. The results showed that pretreatmentwith watermark images for non-geometric attacks have a certain robustness of the watermark image. That the digital watermarking algorithm better balance between invisibility androbustness.(4) Finally, this paper summarizes the main completed work, points out that the furtherresearch direction.