23 October 2003 Asymmetric image verification for security optical systems based on a joint transform correlator architecture
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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.
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Hsuan T. Chang, Hsuan T. Chang, Ching T. Chen, Ching T. Chen, } "Asymmetric image verification for security optical systems based on a joint transform correlator architecture", Proc. SPIE 5202, Optical Information Systems, (23 October 2003); doi: 10.1117/12.502652; https://doi.org/10.1117/12.502652
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