Moiré Pattern Encoded Extended Fractional Fourier Transform Security Hologram

Sharma, A.K. and Chhachhia, D.P. and Aggarwal, A.K. (2008) Moiré Pattern Encoded Extended Fractional Fourier Transform Security Hologram. Journal of Modern Optics , 53 (3). pp. 351-359. ISSN 0950-0340

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Official URL: http://www.tandfonline.com/doi/pdf/10.1080/0950034...

Abstract

This paper describes a simple method for making extended fractional Fourier transform (EFRT) based Moiré pattern encoded security holograms. These security holograms contain multifold concealed and encoded anticounterfeit security features that can only be read through a key hologram and periodic patterns in the final reading process. The encoded features in these holograms are concealed and unknown to the counterfeiter. These features are encoded separately for each individual recording in angularly multiplexed extended fractional Fourier transform hologram (EFRTH). The principle of recording and reconstruction of the proposed security hologram along with experimental results are presented.

Item Type: Article
Uncontrolled Keywords: hologram,security hologram,concealed coding hologram, Moiré pattern encoded, hologram,fractional Fourier,transform encoded hologram, optical security
Subjects: CSIO > Optics
Divisions: Photonics Instrumentation
Depositing User: Ms T Kaur
Date Deposited: 02 Feb 2012 14:36
Last Modified: 10 Apr 2012 16:58
URI: http://csioir.csio.res.in/id/eprint/199

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