Mooney, Aidan and Keating, John (2004) Noisy Optical Detection of Chaos-Based Watermarks. Photonics North, SPIE, 5579.

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Abstract

In this paper we investigate the limits on optical detection of noisy watermarks that use a chaotic function, the logistic difference equation, in the watermark generation scheme. By varying the function seed, different chaotic sequences exhibiting lowpass and highpass characteristics, can be obtained for the function, offering an added security advantage over watermarks generated using pseudorandom sequences. Watermark Detection is the process of determining whether an image is watermarked with a certain watermark. In this paper, we model and investigate an optical correlator suitable for watermark detection for certain classes of high-pass or low-pass watermarks. Once in the public domain a watermarked image may be subjected to noise and other attacks, deliberate and unintentional. Additionally, an optical correlator system will also be subject to shot noise. The effects of shot noise on optically transmitted watermarks are modeled in this paper and we examine how the watermark detection scheme performs in such situations. We quantify the degree of noise that may be present in the watermark detection scheme in order to obtain reliable detection or rejection of a watermark using an optical-correlator.

Item Type:	Article
Additional Information:	Copyright 2004 Society of Photo-Optical Instrumentation Engineers. This paper was published in Photonics North and is made available as an electronic reprint with permission of SPIE. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Keywords:	Digital Watermarking: Optical Correlation: Chaotic Functions
Academic Unit:	Faculty of Science and Engineering > Computer Science
Item ID:	738
Depositing User:	Aidan Mooney
Date Deposited:	17 Oct 2007
Journal or Publication Title:	Photonics North, SPIE
Publisher:	SPIE
Refereed:	Yes
URI:	http://spie.org/
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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