OPTICAL COMPUTERIZED METHOD FOR THE 3D MEASUREMENT OF AN OBJECT BY FRINGE PROJECTION AND USE OF A PHASE-SHIFT METHOD, CORRESPONDING SYSTEM

摘要

An optical computerized method and system for the 3D measurement of the external surface of an object in relief by projection of fringes onto the object and use of a phase-shifting method, wherein four projection axes of the fringes onto the object are implemented, the origin of each projection axis being considered as an illumination point located substantially at each of the four vertices of a virtual tetrahedron, the object being placed substantially at the centre of the tetrahedron, and the shootings are taken from four shooting points located substantially along four shooting axes, each of the shooting axes being the median of one of the four trihedrons formed by the four triplets of projection axes, the four shooting points being located at such a distance from the object that, at each shooting point, each image includes at least one portion of each of the three surfaces of the object that can be lighted by the three illumination points of the triplet of projection axes, the median of which defines the shooting axis of the shooting point, and a set of images of each of the six surfaces that can be illuminated and defined by six couples of illumination points is acquired into the computer equipment.