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

摘要

The invention relates to a computerized optical method for the 3D measurement of the external surface of an relief object by fringe projection on said object and use of phase-shift method in which four fringe projection axis are implemented on the object, the origin of each projecting axis being considered as an illumination point located substantially on each summit of a virtual tetrahedron, the object being placed substantially in the centre of said tetrahedron, wherein the exposures are realized from four exposition points located substantially along four exposure axis, each exposure axis being the median of the of the four tetrahedron formed by the four projection axis triplets, the four exposure points being at a distance from the object such that at each exposure point, each image includes at least one part of each of the three surfaces of the object capable of being lighted by the three illumination points of the triple projection axis defining by its median the exposure axis of the said exposure point, and wherein a set of images is acquired in the computer system, of each of the six surfaces capable of being illuminated and defined by six pairs of illumination points. A corresponding system completes the invention.