Based On Jpeg2000 Digital Watermark Technology

The security of image had already been a very normal and very importance question along with the flourish development of multimedia technology. The digital watermarking is the most importance technology in the security of the image, which there is the excellent future and the expansive mark. JPEG 2000 is a new image coding system that uses state-of-the-art compression techniques based on wavelet technology. Its architecture should lend itself to a wide range of uses from portable digital cameras through to advanced pre-press, medical imaging and other key sectors. The technology of digital watermarking is being to the appliance phase passing by the nearly ten years' development, so the ideal that the digital watermarking based on JPEG2000 is put forward which watermarking technology is embed in the JPEGZOOO's compressing algorithm ,and the research object is applied watermarking scheme.The inevitability of integrating compress algorithm with watermarking algorithm is discuss, and the main work is listed as follows:1. The watermarking must possess several characteristics while the watermarking is embedded in the JPEG2000. The watermarking project adopted the watermarking algorithm based quantize, and some questions must be taken care while the Second Generation Watermarking is applied.2. How the compress algorithm influence on the watermarking algorithm, and pluses and minuses that two algorithm mutually combines was detail analyses. Have put forward the essential features based on embedded watermarking of JPEG2000, The basic conception of embed watermarking in JPEG2000 is that the watermarking algorithm is embed in the compress encoder-decoder. Two kinds of algorithms fully combine and have independency that fully combining reduce algorithm complication referring to utilize the wavelet, quantization and so on and the independence is that the algorithm of the watermarking that which is regarded as a piece of module does not influence the algorithm of compressing. The embedding watermarking scheme that watermarking is embedded after the quantization in compressing algorithms is designed. Compare the confusion based chaos sequence with based toralautopmorhisms, and analyze what the size of quantization of embedded watermarking influences on the robust of watermarking and how to select the size of quantization step according as the magnitude of wavelet transform coefficient. 3. Realize the verification platform watermarking algorithm based on JPEG2000 and test the watermarking scheme that is designed. The testing result indicates that there are one's own unique advantages in the embedded watermarking algorithm that can still be drawn to the watermarking picture while the compression ratio is 1:50. Expose the shortcoming at the same time that is very poor to the resisting of smooth filtration.