Gordon W. Braudaway, Fred Mintzer. Application of invisible image watermarks to previously half-toned images. In Edward J. Delp, Ping Wah Wong, editors, Security, Steganography, and Watermarking of Multimedia Contents VI, San Jose, California, USA, January 18-22, 2004, Proceedings. Volume 5306 of Proceedings of SPIE, pages 663-669, SPIE, 2004.
Abstract is missing.