dc.creator | PIZOLATO JR., Jose Carlos | |
dc.creator | GONCALVES NETO, Luiz | |
dc.date.accessioned | 2012-10-19T01:06:02Z | |
dc.date.accessioned | 2018-07-04T14:47:38Z | |
dc.date.available | 2012-10-19T01:06:02Z | |
dc.date.available | 2018-07-04T14:47:38Z | |
dc.date.created | 2012-10-19T01:06:02Z | |
dc.date.issued | 2009 | |
dc.identifier | OPTICAL ENGINEERING, v.48, n.9, 2009 | |
dc.identifier | 0091-3286 | |
dc.identifier | http://producao.usp.br/handle/BDPI/17735 | |
dc.identifier | 10.1117/1.3223629 | |
dc.identifier | http://dx.doi.org/10.1117/1.3223629 | |
dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/1614533 | |
dc.description.abstract | A 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.language | eng | |
dc.publisher | SPIE-SOC PHOTOPTICAL INSTRUMENTATION ENGINEERS | |
dc.relation | Optical Engineering | |
dc.rights | Copyright SPIE-SOC PHOTOPTICAL INSTRUMENTATION ENGINEERS | |
dc.rights | restrictedAccess | |
dc.subject | Fourier optics | |
dc.subject | phase contrast | |
dc.subject | encryption | |
dc.subject | zeroth-order | |
dc.title | Phase-only optical encryption based on the zeroth-order phase-contrast technique | |
dc.type | Artículos de revistas | |