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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 14, Iss. 4 — Feb. 20, 2006
  • pp: 1458–1467

Fully-phase asymmetric-image verification system based on joint transform correlator

Hsuan T. Chang and Chao-C. Chen  »View Author Affiliations

Optics Express, Vol. 14, Issue 4, pp. 1458-1467 (2006)

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A fully-phase optical asymmetric-image verification system based on a joint transform correlator (JTC) is proposed in this study. Conventional joint power spectra in JTCs are used as the amplitude information for reconstructing only the symmetric target images at the output plane. A previous method, in which an additional phase mask is used at the frequency domain as the phase information, proposed by Chang and Chen [9] was proposed to enable the reconstruction of asymmetric images at the output plane. However, the dominating effect arose from the additional phase makes the wrongly reconstructed image recognizable when the phase key at the input plane is incorrect. In the proposed method, the joint power spectra is nonlinearly transformed into the phase information for reconstructing both symmetric and asymmetric images at the output plane, while the dominating effect in the previous method can be released as well. Simulation results of using two different nonlinear transformations with different parameters are provided to verify the proposed method.

© 2006 Optical Society of America

OCIS Codes
(070.2580) Fourier optics and signal processing : Paraxial wave optics
(070.4550) Fourier optics and signal processing : Correlators
(100.3010) Image processing : Image reconstruction techniques
(100.5070) Image processing : Phase retrieval

ToC Category:
Fourier Optics and Optical Signal Processing

Original Manuscript: December 20, 2005
Revised Manuscript: February 13, 2006
Manuscript Accepted: February 14, 2006
Published: February 20, 2006

Hsuan Chang and Chao-C. Chen, "Fully-phase asymmetric-image verification system based on joint transform correlator," Opt. Express 14, 1458-1467 (2006)

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