Abstract: An optical three-dimensional profilometry method in which are recorded SPECKLE images formed by the interference, due to different optical paths, of the rays reflected/diffused by a rough object and the rays generated by a beam source. The method presents a number of processing steps including the steps of digitizing a first SPECKLE image, modifying the optical path difference, and digitizing a second SPECKLE image recorded after modifying the optical path difference. The difference in the modulus of the corresponding pixels of the first and second digitized images is determined to generate a difference image which is subsequently analyzed. A first arbitrary value is assigned to all the difference image pixels exceeding a given threshold value, and a second arbitrary value is assigned to all the difference image pixels of a value below the threshold.