Inthefieldofimagesegmentation,mostlevel-setbasedactive-contourapproachestakeadvantageofadiscreterepresentationoftheassociatedimplicitfunction.WepresentinthispaperadifferentformulationwheretheimplicitfunctionismodeledasacontinuousparametricfunctionexpressedonaB-splinebasis.Startingfromth