Robust and blind watermarking approach based on modified Delaunay triangulation

摘要

The development of the World Wide Web has not only facilitated the digital data processing and transmission but also has led to ease the illegal distribution and reproduction of digital multimedia online. Several techniques have been proposed to limit the illegal use of transmitted data such as steganography, cryptography and watermarking techniques. The watermarking approach consists in embedding an unnoticeable watermark in the host media by using a private approach. Its performance is considered by the robustness of the algorithm against attacks, the embedding capacity and the imperceptibility of the watermark. Obviously, the synchronous and asynchronous attacks represent the major problem of watermarking technique which limits its robustness quality. Especially, the geometric transformations destroyed the synchronization between the hidden information and the cover image. It can make the detection of the embedded data difficult or even impossible. In fact, the development of a robust image watermarking scheme against geometric distortion represents an interesting research topic. In this order, this research presents a new robust, blind and imperceptible watermarking approach based on a modified Delaunay triangulation constructed by using the features contents of the cover image. Computer simulation using MATLAB applied to 100 images collected from Internet has been used to prove the robustness of the proposed watermarking scheme.