A system and method for calibrating an object having at least one marker attached thereto, wherein a spatial position of the object is ascertained based on the at least one marker, and an outline, view or geometry of the object is optically detected from at least one side. The detected outline, view or geometry is compared with corresponding outlines, views or geometries of stored pre-calibration data of the object, said pre-calibration data representing a model of the object.