Security and encryption optical systems based on a correlator with significant output images

Youzhi Li, Kathi Kreske, Joseph Rosen

Research output: Contribution to journalArticlepeer-review

178 Scopus citations

Abstract

An improved optical security system based on two phase-only computer-generated masks is proposed. The two transparencies are placed together in a 4f correlator so that a known output image is received. In addition to simple verification, our security system is capable of identifying the type of input mask according to the corresponding output image it generates. The two phase masks are designed with an iterative optimization algorithm with constraints in the input and the output domains. A simulation is presented with the resultant images formed by the two phase-only elements. Various mask combinations are compared to show that a combination is unique and cannot be duplicated. This uniqueness is an advantage in security systems.

Original languageEnglish
Pages (from-to)5295-5301
Number of pages7
JournalApplied Optics
Volume39
Issue number29
DOIs
StatePublished - 10 Oct 2000

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