Enhanced optical image verification based on modified joint transform correlator architectures

Hsuan T. Chang; Ching T. Chen

doi:10.1117/12.503806

23 October 2003 Enhanced optical image verification based on modified joint transform correlator architectures

Hsuan T. Chang, Ching T. Chen

Proceedings Volume 5202, Optical Information Systems; (2003) https://doi.org/10.1117/12.503806
Event: Optical Science and Technology, SPIE's 48th Annual Meeting, 2003, San Diego, California, United States

Abstract

In this paper two architectures for optical image verification are roposed. Both architectures are modified from conventional joint transform correlators (JTCs) and can significantly improve the recovered image quality. First, an input phase-only function is Fourier transformed and then is interfered with a reference wave that is diffracted from a plane wave incident on another random phase mask. Second, two phase-only functions are placed at the two input sides of a beam splitter such that the interference patternof their Fourier transforms can be detected. The intensity of the interference pattern in both architectures can be recorded and then its Fourier-transform can be obtained in the output plane. To obtain a predefined target image in the output plane, the input phase function is iteratively retrieved by the use of the projection onto constraint sets algorithm. Simulation results show that the less mean squared error and better image quality are obtained for both the binary and grayscale images.

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Hsuan T. Chang and Ching T. Chen "Enhanced optical image verification based on modified joint transform correlator architectures", Proc. SPIE 5202, Optical Information Systems, (23 October 2003); https://doi.org/10.1117/12.503806

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KEYWORDS

Image quality

Fourier transforms

Charge-coupled devices

Image restoration

Optical correlators

Image enhancement

Signal detection

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