Cramer-Rao bound on watermark desynchronization parameter estimation accuracy

Shankar Sadasivam; Pierre Moulin

doi:10.1117/12.705481

2 March 2007 Cramer-Rao bound on watermark desynchronization parameter estimation accuracy

Shankar Sadasivam, Pierre Moulin

Proceedings Volume 6505, Security, Steganography, and Watermarking of Multimedia Contents IX; 65050H (2007) https://doi.org/10.1117/12.705481
Event: Electronic Imaging 2007, 2007, San Jose, CA, United States

Abstract

Various decoding algorithms have been proposed in the literature to combat desynchronization attacks on quantization index modulation (QIM) blind watermarking schemes. Nevertheless, these results have been fairly poor so far. The need to investigate fundamental limitations on the decoder's performance under a desynchronization attack is thus clear. In this paper, we look at the class of estimator-decoders which estimate the desynchronization attack parameter(s) for using in the decoding step. We model the desynchronization attack as an arbitrary (but invertible) linear time-invariant (LTI) system. We then come up with an encoding-decoding scheme for these attacks on cubic QIM watermarking schemes, and derive Cramer-Rao bounds on the estimation error for the desynchronization parameter at the decoder. As an example, we consider the case of a cyclic shift attack and present some numerical findings.

Citation Download Citation

Shankar Sadasivam and Pierre Moulin "Cramer-Rao bound on watermark desynchronization parameter estimation accuracy", Proc. SPIE 6505, Security, Steganography, and Watermarking of Multimedia Contents IX, 65050H (2 March 2007); https://doi.org/10.1117/12.705481

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
11 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Digital watermarking

Error analysis

Computer programming

Distortion

Quantization

Video

Visualization

Show All Keywords

Keywords/Phrases

Search In:

Publication Years