Research And Optimization On Digital Watermarking Algorithm Based On Svd-dwt

With the rapid development of digital products, the security issuses become a concerning problem.Nowdays,people usually use cryptography to ensure that digital content is not illegal to read.Using digital signature technology ensures that the digital product content will not be distorted..In order to protect the property of digital products content not be violated,people have proposed digital watermarking technology, which has become a hot resarch at home and abroad.This paper reviews the theory of digital watermarking technology-related knowledge, and does systematic and thorough research on digital watermarking technology, detailed research of digital watermarking model and the typical digital watermarking.Using improved Arnold digital image scrambling algorithm to encrypt the watermark image processing, and enhance the anti-attack capability of digital watermarking. Combined with the characteristics of singular value decomposition, it processes the singular decomposition of wavelet transform image to enhance the digital watermark invisibility and robustness. A typical wavelet transform digital watermarking algorithm embeds digital watermark informationin in high-frequency part.By compression, filtering and other image attacks, the digital watermark can easily be damaged. After analysis,in the case of small amount of digital watermarking information,embedding watermark information in wavelet transformed low-frequency part can better improve the robustness of digital watermarking. On this basis, a wavelet transform algorithm based on singular value decomposition is proposed. Test results show that the improved algorithm has higher peak signal to noise ratio, as well as strong anti-attack against cropping, high noise and JPEG compression attacks.Finally, according to security management needs of business electronic invoice, an authentication scheme is proposed based on digital watermarking, to verify the application of the optimizad zalgorithm.