Embedding and Extracting Digital Watermark Based on DCT Algorithm  

作　　者：Haiming Li Xiaoyun Guo 

机构地区：[1]School of Computer Science and Technology, Shanghai University of Electric Power, Shanghai, China

出　　处：《Journal of Computer and Communications》2018年第11期287-298,共12页电脑和通信（英文）

摘　　要：The principle of digital watermark is the method of adding digital watermark in the frequency domain. The digital watermark hides the watermark in digital media, such as image, voice, video, etc., so as to realize the functions of copyright protection, and identity recognition. DCT for Discrete Cosine Transform is used to transform the image pixel value and the frequency domain coefficient matrix to realize the embedding and extracting of the blind watermark in the paper. After success, the image is attacked by white noise and Gaussian low-pass filtering. The result shows that the watermark signal embedded based on the DCT algorithm is relatively robust, and can effectively resist some attack methods that use signal distortion to destroy the watermark, and has good robustness and imperceptibility.The principle of digital watermark is the method of adding digital watermark in the frequency domain. The digital watermark hides the watermark in digital media, such as image, voice, video, etc., so as to realize the functions of copyright protection, and identity recognition. DCT for Discrete Cosine Transform is used to transform the image pixel value and the frequency domain coefficient matrix to realize the embedding and extracting of the blind watermark in the paper. After success, the image is attacked by white noise and Gaussian low-pass filtering. The result shows that the watermark signal embedded based on the DCT algorithm is relatively robust, and can effectively resist some attack methods that use signal distortion to destroy the watermark, and has good robustness and imperceptibility.

关 键 词：Digital WATERMARK DCT Algorithm White Noise GAUSSIAN LOW-PASS Filtering Robustness IMPERCEPTIBILITY 

分 类 号：TP39[自动化与计算机技术—计算机应用技术]