dc.creatorPIZOLATO JR., Jose Carlos
dc.creatorGONCALVES NETO, Luiz
dc.date.accessioned2012-10-19T01:06:02Z
dc.date.accessioned2018-07-04T14:47:38Z
dc.date.available2012-10-19T01:06:02Z
dc.date.available2018-07-04T14:47:38Z
dc.date.created2012-10-19T01:06:02Z
dc.date.issued2009
dc.identifierOPTICAL ENGINEERING, v.48, n.9, 2009
dc.identifier0091-3286
dc.identifierhttp://producao.usp.br/handle/BDPI/17735
dc.identifier10.1117/1.3223629
dc.identifierhttp://dx.doi.org/10.1117/1.3223629
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1614533
dc.description.abstractA phase-only encryption/decryption scheme with the readout based on the zeroth-order phase-contrast technique (ZOPCT), without the use of a phase-changing plate on the Fourier plane of an optical system based on the 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 robustness of the encoding is assured by the nonlinearity intrinsic to the proposed phase-contrast method and the random phase distribution used in the encryption process. The experimental system has been implemented with liquid-crystal spatial modulators to generate phase-encrypted masks and a decrypting key. The advantage of this method is the easy scheme to recover the gray-level information from the decrypted phase-only mask applying the ZOPCT. An analysis of this decryption method was performed against brute force attacks. (C) 2009 Society of Photo-Optical Instrumentation Engineers. [DOI: 10.1117/1.3223629]
dc.languageeng
dc.publisherSPIE-SOC PHOTOPTICAL INSTRUMENTATION ENGINEERS
dc.relationOptical Engineering
dc.rightsCopyright SPIE-SOC PHOTOPTICAL INSTRUMENTATION ENGINEERS
dc.rightsrestrictedAccess
dc.subjectFourier optics
dc.subjectphase contrast
dc.subjectencryption
dc.subjectzeroth-order
dc.titlePhase-only optical encryption based on the zeroth-order phase-contrast technique
dc.typeArtículos de revistas


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