TY - CONF T1 - A 'gas of Circles' Phase Field Model and its Application to Tree Crown Extraction T2 - Proceedings of the European Signal Processing Conference (EUSIPCO) Y1 - 2007 A1 - Peter Horvath A1 - Ian Jermyn ED - Marek Domanski ED - Ryszard Stasinski ED - Maciej Bartkowiak JF - Proceedings of the European Signal Processing Conference (EUSIPCO) CY - Poznan, Poland ER -