公开(公告)号：US10036685B2

公开(公告)日：2018-07-31

申请号：US15157835

申请日：2016-05-18

Applicant: JAND, INC.

Inventor： David Howard Goldberg ,  Joseph Carrafa

IPC: G01M11/02

CPC classification number: G01M11/0228 ,  G01M11/0235 ,  G01M11/0242 ,  G01M11/0264

Abstract: A process is provided for determining characteristics of a lens, the process including obtaining a captured image of a pattern through a corrective lens; transforming the captured image to an ideal coordinate system; processing the captured image to determine an overall distortion from a reference pattern to the pattern of the captured image; determining a distortion of the captured pattern attributable to the corrective lens; and measuring at least one characteristic of the corrective lens. In some embodiments, the overall distortion is determined by detecting, in the captured image, at least one captured pattern landmark; determining a transformation from at least one ideal pattern landmark to the at least one captured pattern landmark; and determining for the corrective lens, from the transformation, a spherical power measurement, a cylinder power measurement, and an astigmatism angle measurement.