Halftone Visual Cryptography with Complementary Cover Images

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• 关键词：Visual cryptography ; Visual secret sharing ; Extended visual cryptography ; Halftone visual cryptography ; Meaningful shares
• 刊名：Lecture Notes in Computer Science
• 出版年：2017
• 出版时间：2017
• 年：2017
• 卷：10082
• 期：1
• 页码：223-237
• 丛书名：Digital Forensics and Watermarking
• ISBN：978-3-319-53465-7
• 卷排序：10082

文摘

By the addition of halftone techniques, halftone visual cryptography scheme (HVCS) embeds a secret image into halftone shares taking meaningful visual information. In this paper, we propose a (k, n)-HVCS using complementary cover images. Before the halftone processing of the cover images by error diffusion, secret information pixels (SIPs) are prefixed based on the underlying (k, n)-VCS. In the halftone processing, several pairs of complementary cover images are adopted and two halftone methods on the cover images are designed for different (k, n) threshold access structures. The proposed scheme removes the share’s cross interference from other shares and obtains better visual quality. Furthermore, the proposed scheme eliminates the burden that each participant may carry multiple shares.