Mooney, Aidan and Keating, John
Noisy Optical Detection of Chaos-Based Watermarks.
Photonics North, SPIE, 5579.
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.
||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.
||Digital Watermarking: Optical Correlation: Chaotic Functions
||Science & Engineering > Computer Science
||17 Oct 2007
|Journal or Publication Title:
||Photonics North, SPIE
Repository Staff Only(login required)
||Item control page