1. Univ. Lille,CNRS, Inria, Centrale Lille, UMR 9189 CRIStAL,Lille,France,F-59000
2. University of Parma,Deparment of Architecture and Engineering,Italy
3. Institut Mines-Télécom, Univ. Lille, Centre for Digital Systems,IMT Nord Europe,France
4. Media Integration ad Communication Center University of Florence,Italy