NDLI: Asymmetric image verification for security optical systems based on a joint transform correlator architecture

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Asymmetric image verification for security optical systems based on a joint transform correlator architecture

Content Provider	Semantic Scholar
Author	Chang, Hsuan T. Chen, C. T.
Copyright Year	2003
Abstract	Conventional optical image verification systems based on the joint transform correlator (JTC) can only recover symmetric images in the output plane, which is an limitation to practical usage. In this paper, an optical asymmetric-image verification system based on the JTC is proposed. An additional phase mask is attached with a spatial light modulator (SLM), which displays the joint power spectrum as the amplitude information, to enable the reconstruction of an asymmetric image in the output plane. Two phase functions are paired and iteratively retrieved by the use of the projection onto constraint sets algorithm. One key is one of the joint functions in the input plane and acts as the key. The other phase is attached by the SLM. Compared with the image verification system based on the JTC architecture, the proposed system can obtain the asymmetric images in the output plane. In addition, the the proposed architecture can also yield the better image quality for symmetric images. Simulation results are given to verify the proposed method.
File Format	PDF HTM / HTML
DOI	10.1117/12.502652
Volume Number	5202
Alternate Webpage(s)	http://teacher.yuntech.edu.tw/~htchang/Asym_img1.pdf
Alternate Webpage(s)	https://doi.org/10.1117/12.502652
Journal	SPIE Optics + Photonics
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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