Kumar, Raj and Mohan, D. and Aggarwal, A.K. (2007) Interferometric key readable security holograms with secrete-codes. Parmana Journal of Physics, 68 (3). pp. 443-450. ISSN 0304-4289
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Abstract
A new method is described to create secrete-codes in the security holograms for enhancing their anti-counterfeiting characteristics. To imitate these codes is di±cult as pure phase objects having complex phase distribution function are used to modulate the object beam that is recorded in conjunction with an encoded interferometric reference beam derived from a key hologram. Lloyd's folding mirror interferometer is used to convert phase variations of the reconstructed wave-front into an intensity pattern for hologram authenticity veri¯cation. Creating the secrete-codes through an interferometric reference beam from the key hologram facilitates a multi-stage authenticity veri¯cation as well as easy repositioning of the security hologram through a speci¯c Moir¶e pattern generated during the veri¯cation process
Item Type: | Article |
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Uncontrolled Keywords: | Optical security, authenticity verification |
Subjects: | CSIO > Optics |
Depositing User: | Ms. J Shrivastav |
Date Deposited: | 03 Apr 2012 12:37 |
Last Modified: | 11 Apr 2012 11:11 |
URI: | http://csioir.csio.res.in/id/eprint/72 |
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