Temporal Integration Based Visual Cryptography Scheme and Its Application

摘要

Visual cryptography scheme (VCS) is an image secret sharing method which exploits the spatial responds characteristics of Human visual system (HVS). Applications of traditional OR and XOR based VCSs are seriously limited by the implementation carrier in practice. In this paper, we proposed a new kind of VCS which is implemented on modern display terminal of high refresh rates. Our approach exploits the temporal responds characteristics of HVS that light signals are temporal integrated into a single steady continuous one if the frequency exceeds critical fusion frequency (CFF). Furthermore, basing on the proposed VCS, we implement an information security display technology that can prevent unauthorized photography. Only authorized viewers can recover the secret information with the help of synchronized glass. While unauthorized viewers with naked eye or camera get nothing about the secret information. Experimental results show the effectiveness of proposed temporal integration based VCS and information security display technology.