Visual cryptography for gray-level images by dithering techniques

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題名:	Visual cryptography for gray-level images by dithering techniques
作者:	C. C. Lin;W. H. Tsai
貢獻者:	Department of Information Communication
關鍵詞:	Visual cryptography;Secret sharing;Watermarking;Dithering
日期:	2003-01
上傳時間:	2009-11-25 02:31:13 (UTC+0)
出版者:	Asia University
摘要:	A (k,n)-threshold visual cryptography scheme is proposed to encode a secret image into n shadow images, where any k or more of them can visually recover the secret image, but any k−1 or fewer of them gain no information about it. The decoding process of a visual cryptography scheme, which differs from traditional secret sharing, does not need complicated cryptographic mechanisms and computations. Instead, it can be decoded directly by the human visual system. Previous efforts in this topic are almost restricted in processing binary images, which are insufficient for many applications. In this paper, a new visual cryptography scheme suitable for gray-level images is proposed. Instead of using gray subpixels directly to construct shares, a dithering technique is used first to convert a gray-level image into an approximate binary image. Then existing visual cryptography schemes for binary images are applied to accomplish the work of creating shares. The overall effect of the proposed method is the achievement of visual encryption and decryption functions for gray-level images. Some comparisons with a previously proposed method are also made. Some experimental results are shown to prove the feasibility of the proposed method. Finally, an application is mentioned to show its practicability.
關聯:	Pattern Recognition Letters 24 (1-3): 349-358
顯示於類別:	[資訊傳播學系] 期刊論文

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