The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 01, 1997
Filed:
Apr. 27, 1995
Applicant:
Inventors:
Christian Ducarouge, Lyons, FR;
Richard Grisel, Lyons, FR;
Nicholas Giraud, Lyons, FR;
Helene Sottocasa, Verrieres, FR;
Alain Chansavoir, Saint-Maur, FR;
Ahmed Haddadi, Draveil, FR;
Assignee:
Essilor International, , FR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A61B / ; A61B / ;
U.S. Cl.
CPC ...
351204 ; 351200 ;
Abstract
A method for determining measurement parameters from the image of a spectacle wearer wearing a spectacle frame is disclosed in which the position of the center of the pupil of each eye is obtained automatically by analyzing the luminance gradient in the region of the pupils and the positions of the horizontal and vertical straight lines tangential to the frame are also obtained automatically by luminance gradient analysis and extraction of the contours of the frame, enabling said parameters to be calculated accurately.