| 1. | Theoretical analysis and results of computer simulation show that the proposed method is not only feasible but also simple comparing with classic method . secondly , in connection of hidden danger in security due to symmetric system , a novel encoding techniques is proposed with spherical wave illumination based on asymmetric system
其次,针对现有光学加密系统的对称性给系统安全性能所带来的隐患,在4f系统的基础上,不增加系统元件的情况下,提出了一种用球面波照射非对称准傅立叶变换系统进行光学图像加密的新方法。 |
