Nishchal, Naveen K. and Pitkäaho, Tomi and Naughton, Thomas J. (2010) Digital Fresnel Hologram Watermarking. In: 2010 9th Euro-American Workshop on Information Optics (WIO). IEEE, pp. 1-3. ISBN 9781424482269

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Abstract

We present a method of digital hologram watermarking using a Fresnel hologram of a real-world 3D object and the fractional Fourier transform. A watermark is encrypted using double random phase fractional Fourier domain encoding technique and then encoded into the digital hologram. The hologram is watermarked in a plane at some known distance from the object so that even if a new hologram is generated from the original hologram the watermark can always be traced by propagating the new hologram back to the object and then onto the watermark plane. The watermark is retrieved successfully using the correct encryption parameters. We consider both numerical (full complex field) and optoelectronic (phase-only) reconstruction methods. We obtain the watermark from different windows of the hologram corresponding to different reconstruction perspectives.

Item Type:	Book Section
Keywords:	digital hologram; watermarking; Fresnel hologram; fractional Fourier transform;
Academic Unit:	Faculty of Science and Engineering > Computer Science
Item ID:	8608
Identification Number:	https://doi.org/10.1109/WIO.2010.5582496
Depositing User:	Thomas Naughton
Date Deposited:	16 Aug 2017 15:31
Publisher:	IEEE
Refereed:	Yes
Funders:	Academy of Finland, Science Foundation Ireland, European Commission Marie Curie Intra-European Individual Fellowship
URI:
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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