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摘要


視覺密碼是一個影像分享機制。一個基於隨機網格的視覺密碼方法在1987年被Kafri及Keren提出來,並引起很大的迴響。以視覺密碼為基礎的影像分享方法中,以隨機網格擁有最好的特性,這個方法不但没有像素擴張的缺點,也不需事先設計編碼簿。在本論文中,我們提出了一個以隨機網格為基礎的影像分享法,並在演算法中設計了一個基於(k,n)門檻資料分享理論的快速解碼器,實驗結果顯示本研究不僅能無失真取回原始影像,執行效率也較先前演算法佳。

並列摘要


Visual cryptography (VC) is an image-based secret protection mechanism. A new VC approach by random grids, based on Kafri and Keren (1987), has drawn attention recently. With almost all advantages of VC-based image sharing, RG-based image sharing benefits more from no pixel expansion and without the need of predefined code book. In this paper, an RG-based image sharing approach aiming at providing a fast-encoding version is presented. The experimental results show that the proposed approach performs faster than the previous work.

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