公开(公告)号：US20220011238A1

公开(公告)日：2022-01-13

申请号：US17309068

申请日：2019-11-13

Applicant: 3M INNOVATIVE PROPERTIES COMPANY

Inventor： Francis T. Caruso ,  Jeffrey K. Eliason ,  David L. Hofeldt ,  Joseph E. Hernandez ,  Joshua A. Gullickson

IPC: G01N21/84 ,  G01N21/95 ,  G01N21/55 ,  G06T7/00

Abstract: A method includes emitting light from a light source (12) onto an at least partially reflective surface (24). The reflected light (30) is collected from the surface at a screen (32) to capture the intensity distribution (34) of the reflected light with a camera (40) in a first image (42). The intensity distribution of the first image of the reflected light is processed (50) by performing suitable filtering of a Fourier transform of the intensity distribution of the reflected light so as to emphasize features having an intensity variation of interest. The features of the intensity distribution of the reflected light having the variation of interest are analyzed to determine a uniformity value for the surface.