WATERMARK ADDING METHOD AND SYSTEM, WATERMARK IDENTIFYING METHOD AND SYSTEM

摘要

The invention provides a watermark adding method, comprising the following steps of: extracting a part characteristic point of an image to be added with a watermark; selecting a watermark adding area of the image to be added with the watermark according to the extracted part characteristic point; using a secret key to generate a watermark matrix in fit with normal distribution; and adding the watermark to the selected area to be added with the watermark according to the generated watermark matrix. The invention further provides a watermark adding system for realizing the method, and a watermark identifying method and system for identifying the watermark added according to the method. With the adoption of the watermark adding method and system as well as the watermark identifying method and system provided by the invention, the problems of robustness and invisibility of the watermark can be solved.