METHOD AND APPARATUS FOR EMBEDDING DIGITAL INFORMATION IN DIGITAL MULTIMEDIA DATA

摘要

A steganographic method is disclosed to embed an invisible watermark into an image. It can be used for copyright protection, content authentication or content annotation. The technique is mainly based on K-L transform. Firstly a block and cluster step (106) and cluster selection step (108) are performed to enhance the optimization of K-L transform (110) for a given image. Then a watermark is embedded (114) into the selected eigen-clusters. ECC (Error Correction Code) can be employed to reduce the embedded code error rate. The proposed method is characterized by robustness despite the degradation or modification on the watermarked content. Furthermore, the method can be extended to video, audio or other multimedia especially for multimedia databases in which the stored multimedia are categorized by their contents or classes.