Inourpreviousworkwepresentedamodel-basedapproachtoperformrobust,high-speedfacelocalizationbasedontheHausdor®distance.Acrucialstepduringthedesignofthesystemisthechoiceofanappropriateedgemodelthat¯tsforawiderangeofdi®erenthumanfaces.Inthispaperwepresentanoptimizationapproachthatc