Multiple Watermarking in Visual Cryptography

Authors:
Hao Luo;Zhe-Ming Lu;Jeng-Shyang Pan
Affiliations:
Harbin Institute of Technology, Harbin, P.R. China 150001;Sun Yat-sen University, Guangzhou, P.R. China 501725;Kaohsiung University of Applied Sciences, Kaohsiung, Taiwan 807
Venue:
IWDW '07 Proceedings of the 6th International Workshop on Digital Watermarking
Year:
2008

Citing 5
Cited 0

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Abstract

This paper proposes a scheme to hide two watermarks in visual secret sharing of a gray level image. One watermark is embedded during secret image halftoning, and the other is hidden during the halftone image encryption. A non-expansion visual secret sharing model is used to encrypt the halftone image. In watermark extraction, only Exclusive-OR operation is needed, and basic properties of conventional visual cryptography technique are still preserved. Experimental results show the effectiveness of our schemes.