E. Simonetto, and A. Saadane
Watermarking, colour image, human visual system, sub-band decomposition, masking effects, Regions of interest
Image watermarking aims at embedding an invisible mark. Insertion
must also ensure future detection and robustness to malevolent
attacks. In this article, a perceptual method of colour image
watermarking is presented. It is based on an adapted computation
of the insertion strength that respects invisibility. For that purpose,
both lower and higher level perceptual processes are taken into
account. These processes include the sensitivity of the human visual
system (HVS) modelled by a visual sub-band decomposition (VSD),
the masking effects and the visual attention modelling. Results show
the ability of the proposed method to deal with different attacks.
Experiences have been conducted on several digitized colour images
to compare the pertinence of different antagonist colour spaces when
the achromatic component only is watermarked.