摘要
提出一种将散斑干涉应用于光学加密的方法。在任意一束散斑干涉光路中放置含二值信息的相位掩膜,由散斑干涉产生实振幅型加密图像,移去相位掩膜可得到解密密钥。该方法用双随机幅—相进行编码加密,提高系统安全性,更换密钥方便,解密图像信噪比高,可用于大信息量二值图像加密。加密图像是实值,便于显示或打印。本文给出了计算机仿真实验结果。
A new ESPI method applied to optical encryption is presented. When phase mask with binary information is added to one route of the ESPI system, the encrypted image is obtained by speckle interference. Decryption key code is produced when the phase mask is removed. The method improved the security by encrypting the informnation with random amplitude and phase. The key codes can be shifted frequently. The PSNR of the decrypted image is appropriate for encryption of binary image with large information. Real - value encrypted image is fit for output and transmission. Computational simulations are presented.
出处
《激光杂志》
CAS
CSCD
北大核心
2007年第5期44-45,共2页
Laser Journal
