AbstractThispaperpresentsapart-basedfacedetectionapproachwherethespatialrelationshipbetweenthefacepartsisrepresentedbyahidden3Dmodelwithsixparameters.Thecomputationalcomplexityofthesearchinthesixdimensionalposespaceisaddressedbyproposingmeaningful3Dposecandidatesbyimage-basedregressio