Optical implementation of image encryption using the zero-order phase-contrast technique

Jose Carlos Pizolato Jr.; Luiz Goncalves Neto

doi:10.1117/12.542461

12 April 2004 Optical implementation of image encryption using the zero-order phase-contrast technique

Jose Carlos Pizolato Jr., Luiz Goncalves Neto

Proceedings Volume 5437, Optical Pattern Recognition XV; (2004) https://doi.org/10.1117/12.542461
Event: Defense and Security, 2004, Orlando, Florida, United States

Abstract

An encryption/decryption scheme based on a new Phase-Contrast Technique, without the use of a phase-changing plate (phase dielectric dot) on the Fourier plane of a 4f optical correlator is proposed. The encryption of a gray level image is achieved by multiplying the phase distribution obtained directly from the gray level image by a random phase distribution. The encoding is obtained without any iterative calculation to generate the encrypted phase-only mask. The robustness of the encoding is assured by the non-linearities intrinsic to the phase-contrast method and the random phase distribution used in the encryption process. The advantage of this method is the easy scheme to recover the gray level information from the decrypted phase-only mask applying the proposed Zero-Order Phase-contrast Technique.

Citation Download Citation

Jose Carlos Pizolato Jr. and Luiz Goncalves Neto "Optical implementation of image encryption using the zero-order phase-contrast technique", Proc. SPIE 5437, Optical Pattern Recognition XV, (12 April 2004); https://doi.org/10.1117/12.542461

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KEYWORDS

Image encryption

Spatial light modulators

Computer programming

Phase contrast

Optical correlators

Optical image encryption

Fourier transforms

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