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Multiple-phase retrieval for optical security systems by use of random-phase encoding

机译：通过使用随机相位编码对光学安全系统进行多阶段检索

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摘要

The technique of the multiple phase encoding for optical security and verification systems is presented in this paper. This technique is based on a 4-f optical correlator that is a common architecture for optical image encryption and verification systems. However, two or more phase masks are iteratively retrieved by use of the proposed multiple phases retrieval algorithm (MPRA) to obtain the target image. The convergent speed of the iteration process in the MPRA is significantly increased and the recovered image is much more similar to the target image than those in previous approaches. In addition, the quantization effects due to the finite resolution of the phase levels in practical implementation are discussed. The relationships between the number of phase masks and the quantized phase levels are also investigated. According to the simulation results, two and three phase masks are enough to design an efficient security verification system with 64 and 32 phase levels, respectively.
机译：本文介绍了用于光安全性和验证系统的多相位编码技术。该技术基于4-f光学相关器，该相关器是光学图像加密和验证系统的通用体系结构。然而，通过使用所提出的多相检索算法（MPRA）来迭代地检索两个或更多的相位掩模以获得目标图像。 MPRA中迭代过程的收敛速度显着提高，并且与以前的方法相比，恢复的图像与目标图像更加相似。另外，讨论了在实际实现中由于相位水平的有限分辨率而引起的量化效果。还研究了相位掩模的数量与量化的相位水平之间的关系。根据仿真结果，两个和三个相位掩模足以设计出一个具有64和32个相位级别的高效安全验证系统。

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