DIGITAL WATERMARKING METHOD ROBUST AGAINST LOCAL AND GLOBAL GEOMETRICAL DISTORTIONS AND PROJECTIVE TRANSFORMS

摘要

The present invention relates to the methods for hybrid watermarking method joining a robust and a fragile watermark, and thus combining copyright protection, authentication and tamperproofing. As a result this approach is at the same time resistant against the copy attack. In addition, the fragile information is inserted in a way which preserves the resistance and reliability of the robust part.