Watermark resynchronization based on elastic graph matching for enhanced robustness against local geometric distortions

Doërr, Gwenaël J;Rey, Christian;Dugelay, Jean-Luc
Research report RR-04-113

Most of the watermarking algorithms can still be defeated by geometric distortions today. If the weakness against global distortions can almost be considered as solved, local geometric distortions such as the ones introduced by StirMark remain a major issue. An original resynchronization method is consequently proposed in this report as a potential countermeasure against such attacks. The basic idea consists in interlacing resynchronization bits with the bits carrying the payload during the watermark embedding. During the extraction, those bits are used as anchor points to estimate and compensate for small local and global geometric distortions. This registration procedure is performed using an Elastic Graph Matching (EGM) approach.


Type:
Rapport
Date:
2004-08-01
Department:
Sécurité numérique
Eurecom Ref:
1477
Copyright:
© EURECOM. Personal use of this material is permitted. The definitive version of this paper was published in Research report RR-04-113 and is available at :

PERMALINK : https://www.eurecom.fr/publication/1477