Research on zero watermarking technique based on improved Sobel operator

As digital watermarking technology becomes more and more important in the field of information security and socio-economics, various sectors have become active, making digital watermarking technology develop rapidly. Scientific research institutes, universities and commercial groups from all over the world are actively participating or investing in this research and many advanced algorithms have been proposed. In this paper, we read, study and analyze the existing algorithms based on zero watermarking technology and propose a zero watermarking algorithm against geometric attacks. This technology is of great relevance to people's lives, economic development and social progress.