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Double random-phase encoding in the Fresnel domain.

Authors
Type
Published Article
Journal
Optics letters
Publication Date
Volume
29
Issue
14
Pages
1584–1586
Identifiers
PMID: 15309826
Source
Medline
License
Unknown

Abstract

A lensless optical security system based on double random-phase encoding in the Fresnel domain is proposed. This technique can encrypt a primary image to random noise by use of two statistically independent random-phase masks in the input and transform planes, respectively. In this system the positions of the significant planes and the operation wavelength, as well as the phase codes, are used as keys to encrypt and recover the primary image. Therefore higher security is achieved. The sensitivity of the decrypted image to shifting along the propagation direction and to the wavelength are also investigated.

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