Multiple Watermarking in Visual Cryptography

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.

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