计算全息实现信息相干分解及其在图像加密中的应用

提出一种利用计算全息对信息进行随机相干分解的加密存储方法,它是将须加密图像信息根据相干原理分解成随机的两部分,分别记录在两张计算全息图上.当两张全息图对准合在一起照明再现时,从两张全息图衍射光波的干涉图样中可以再现出原来的信息.只有同时拥有这两张配对的全息图方可解出原来的信息,因而用于图像信息的加密时,具有很高的安全性.

Implementation of Information Decomposing Using CGH and Its Application in Optical Image Encryption

An information encryption method using CGH is presented in this paper. In this method, the encryption information is divided into two parts and recorded on two CGHs, respectively, the phase of wave recorded on each CGH has been coded according to the recording information and distributing randomly. When a single CGH is reconstructed, no information will be observed, while two alignment combining CGHs are reconstructed, the original information will be observed in the interference patterns of the two reconstructed waves. Information can be read out only when two holograms are matched, which ensure hologram a high encryption ability.