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Phase-Signature Based Watermarking for Multimedia Authentication: Analysis and Design
 

Summary: Phase-Signature Based Watermarking for Multimedia
Authentication: Analysis and Design
Farid Ahmed*a
, Ira S. Moskowitzb
a
The Catholic University of America, Dept. of EECS, Washington, DC, USA 20064
b
Naval Research Laboratory, CHACS-Code 5540, Washington, DC USA 20375
ABSTRACT
In this work, we address phase-signature based digital image watermarking. The signature is extracted
from the Fourier phase information of the digital media. It is then embedded in the Fourier magnitude
spectrum. The detection and/or authentication is based on the well established area of phase-only filter
based correlation techniques in the optics community. We propose to analyze the distortion coming out
of the embedding process, model it, and eventually parameterize it so that optimal embedding can be
done by trading off with other aspects of watermarking. It will be shown why permutation like
functions facilitate the signature embedding process by minimizing the embedding degradation.
Keywords: Authentication, Watermarking, Correlation, PhasemarkTM, information hiding, phase-only
filter.
1. INTRODUCTION
Multimedia authentication is concerned with the verification of the integrity of the contents and the

  

Source: Ahmed, Farid - Department of Electrical Engineering and Computer Science, Catholic University of America

 

Collections: Engineering