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