Shift visual cryptography scheme of two secret images

作     者：WANG Daoshun , LUO Ping, YANG Lu, QI Dongxu and DAI Yiqi (1. Department of Computer Science and Technology, Tsmghua University, Beijing 100084, China 2. Chengdu Institute of Computer Applications, Chinese Academy of Sciences, Chengdu 610041, China 3. School of Information Science and Technology, Zhongshan U-niversity, Guangzhou 510275, China) 

出 版 物：《Progress in Natural Science:Materials International》 (自然科学进展·国际材料(英文))

年 卷 期：2003年第6期

页      面：59-65页

学科分类：08[工学] 080203[工学-机械设计及理论] 0802[工学-机械工程] 

基　　金：the National Natural Science Foundation of China (Grant No.60133020) Major State Basic Research Development Program of China (Grant No.1998030420 G1998030602 G1998030608) and the Knowledge Innovation Program of the Chinese Academy of Sciences 

主　　题：visual cryptography compound function family minimum threshold scheme. 

摘      要：A new visual cryptography scheme of two secret images, which is named the shift visual cryptography of two secret images, is given. The compound function family of a general construction model is also introduced. The uniqueness and validity of this model are proved, and the minimum rows and columns for realizing the scheme are obtained. Compared with visual cryptography of one secret image, the shift visual cryptography scheme can share two secret images with the same size of pixels expansion without losing the contrast. It has randomness and various forms, and furthermore, we can also visually recover two secret images even if the two shares are different in form and color.