US 12,392,728 B2
Method for measuring the geometry of a glazing by projection of a random light pattern
Céline Wiss, Caumont sur Durance (FR); Paul Leplay, Robion (FR); Adrien Carlu, Avignon (FR); Vincent Marc Gleize, Avignon (FR); and Flavien Fremy, Brookline, MA (US)
Assigned to SAINT-GOBAIN GLASS FRANCE, Courbevoie (FR)
Appl. No. 17/798,469
Filed by SAINT-GOBAIN GLASS FRANCE, Courbevoie (FR)
PCT Filed Feb. 9, 2021, PCT No. PCT/EP2021/053101
§ 371(c)(1), (2) Date Aug. 9, 2022,
PCT Pub. No. WO2021/160618, PCT Pub. Date Aug. 19, 2021.
Claims priority of application No. 2001283 (FR), filed on Feb. 10, 2020.
Prior Publication US 2023/0099412 A1, Mar. 30, 2023
Int. Cl. G01N 21/88 (2006.01); G01N 21/958 (2006.01)
CPC G01N 21/8806 (2013.01) [G01N 21/958 (2013.01); G01N 2021/8887 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A computer-implemented method for determining the three-dimensional geometry of a transparent glazing based on a mineral glass, said method using, as input data:
a digital reference model of the three-dimensional geometry of the glazing, and
at least two digital images of a random light pattern projected onto a surface of the glazing, said at least two digital images representing said pattern at two different observation angles relative to a normal to the surface of the glazing;
said method providing, as output data, a digital model of the three-dimensional geometry of said glazing;
said method comprising:
(a) a step of anchoring the digital reference model to one of the digital images by at least three anchoring points;
(b) a step of calculating, based on the digital reference model, two virtual digital images of the glazing at the same two observation angles as those of the two digital images provided as input data;
(c) a step of calculating residues corresponding to differences between the two virtual images obtained in step (b) and the at least two digital images provided as input data, and
(d) a step of iterating steps (b) and (c), each iteration comprising a step of calculating a modified digital model based on a prior modified digital model provided as input datum for said step (d), so as to minimise values of the residues until the values are under a previously defined threshold value σ, the modified digital model then corresponding to an output datum.