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

✍ Scribed by Hsuan T. Chang; Ching T. Chen

• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 884 KB
• Volume: 239
• Category: Article
• ISSN: 0030-4018
• DOI: 10.1016/j.optcom.2004.05.019

✦ Synopsis

In this paper, an optical asymmetric-image verification system based on the joint transform correlator architecture is proposed. An additional phase mask is attached to the spatial light modulator that displays the joint power spectrum as the amplitude information, to improve the system security and also enable the reconstruction of an asymmetric image. Two phase-only functions as keys are paired and iteratively retrieved by the use of the projection onto constraint sets and the multiple phase retrieval algorithms. In addition to the capability of reconstructing asymmetric images, the proposed architecture can also yield the better image quality for symmetric images. Simulation results are given to verify the proposed method and the dominant effects of two phase keys are discussed.