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Adrian G. Bors, Ioannis Pitas. Image Watermarking Using DCT Domain Constraints, (ICIP'96) IEEE International Conference on Image Processing, September. Vol. III 1996. pp. 231-234. [.Z]   ABSTRACT Watermarking algorithms are used for image copyright protection. The algorithms proposed in this study select certain blocks in the image based on a Gaussian network classifier. The pixel values of the selected blocks are modified such that their Discrete Cosine Transform (DCT) coefficients fulfill a constraint imposed by the watermark code. Two different constraints are considered. The first approach consists of embedding a linear constraint among selected DCT coefficients and the second one defines circular detection regions in the DCT domain. A rule for generating the DCT parameters of distinct watermarks is provided. The watermarks embedded by the proposed algorithms are resistant to JPEG compression. | Neil's Homepage | Steganography | JJTC Main Page | Send comments to nfj(at)jjtc(dot)com. Copyright, ©1995-2008, Neil F. Johnson. All Rights Reserved. Steganography and Digital Watermarking Cryptography and Encryption The Codebreakers Research in Cryptography Related Topics and Issues Documents, News and Publications Security Newsgroups Security Tools and Archives Organizations in Security and Privacy Other Security Links -------------------------------------------- Main Security Page Neil's Home Page JJTC Home Page Center for Secure Information Systems Site Map -------------------------------------------- Cryptanalysis Cryptography and Encryption Documents, News and Publications Government Agencies Interest and User Groups Journals Network Security Newsletters Organizations in Security and Privacy Related Security Topics and Issues Research in Cryptography Security Page Security Applications Security Newsgroups Security Software Security Tools and Archives Special Events and Announcements Steganography and Digital Watermarking Steganography Documents Usenet Security Newsgroups Vendors Other Security Links