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影像處理暨通訊期刊

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篇名 Weighted Visual Cryptography with Non-Expansible Shares
卷期 5:1
作者 Chen, Shang-Kuan
頁次 001-006
關鍵字 non-expansible visual cryptographyweighted transparencies
出刊日期 201312

中文摘要

英文摘要

In this paper, a non-expansible visual cryptography (VC) scheme with weighted-style is designed in this paper. The n weighted transparencies { t1, t2,…, tn }, called shares, are generated to share a secret image. No single share can reveal any information about the secret image. However, when we stack at least two shares, the secret image is revealed to an extent; and the revealed contrast level is (SUM{weights}- MAX{weights})/(p×q). (Here, both SUM and MAX operators are evaluated using the set of the shares being stacked, which is a subset of {t1, t2,…, tn}, and p×q means encoded block size.) The proposed VC scheme is fault-tolerant and with progressive contrast; furthermore, if weights are suitably chosen, then our best contrast is often higher than that of every reported design.

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