Research and Application of Blind Watermark Based on DCT

As the content of electronic documents has become increasingly important and prominent in the present day, most companies or enterprises pay more and more attention to the security of internal electronic documents. To solve the problem of information leakage in electronic documents, this paper proposes a method about digital watermark technology based on DCT transform and develops a system to assist companies or enterprises in adding and extracting blind watermarks to image materials. The system uses Hough transform as well as Arnold scrambling algorithm and provides pre-processing methods for images in different situations. It provides a blind watermark application scheme which does not seriously disturb the user's vision or spoil the content of the images, but also can resist a series of attacks such as extraction, rotation, and cropping. This scheme not only allows companies or enterprises to trace images back to the source of the leak to make sure that the significant internal electronic documents are not leaked by such a deterrent approach, but also considers the security of personal information of the operators to prevent further vulnerabilities. The system developed in this paper meets the needs of the companies or enterprises in specific application scenarios and is easy to embed in the real development environment.