Method and system for watermark decoding

摘要

The procedure provides determination of local geometric variations appearing in data by modelling the local geometric variations with the aid of an index variable (J). This enables a check of the correspondence between the deformed data and the original data. The procedure provides determination of local geometric variations appearing in data which is read by a watermark reading device. The data includes a reference mark. The procedure includes a first stage of modelling the local geometric variations with the aid of an index variable (J), the variable enabling a check of the correspondence between the deformed data and the original data. The second stage includes estimating the local variations by using the reference mark, using a local deformation model of the data and the deformed data. The estimation of local geometric variations may be carried out globally, or locally. The local deformation model may be a Markov model. The data in question may either be audio data, or video or other image data.