Security and watermarking of multimedia contents : 25-27 January 1999, San Jose, California. pp.264-272, 1999. Bellingham, Wash.. SPIE - The International Society for Optical Engineering
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Security and watermarking of multimedia contents II : 24-26 January 2000, San Jose, California. pp.99-109, 2000. Bellingham, Wash.. SPIE - The International Society for Optical Engineering
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Applications of digital image processing XXIV : 31 July - 3 August 2001, San Diego, USA. pp.85-94, 2001. Bellingham, Wash., USA. SPIE-The International Society for Optical Engineering
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Proceedings of SPIE - the International Society for Optical Engineering