Method for measuring morpho-geometric parameters of a spectacle wearing individual

Patent metadata

Field	Value
Publication number	US-9759934-B2
Application number	US-201214345991-A
Country	US
Kind code	B2
Filing date	Sep 18, 2012
Priority date	Sep 28, 2011
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

A method for measuring at least one geo-morphometric parameter of an individual wearing glasses that includes adjusting the inclination of the image acquisition system so that it lies in an acceptable angular range; adjusting the height of the image acquisition system so that the individual can see the target along a substantially horizontal line of sight; observation of the target, by the individual; acquiring at least one image of the eyes of the individual and of the frame. The method includes processing the at least one image using the processing unit in order to determine each geo-morphometric parameter of the individual from the position of their pupils and the inclination of their glasses and returning the result of the measurements.

First claim

The invention claimed is:

1. A method for measuring at least one morpho-geometric parameter of an individual wearing spectacles, said method employing a stand-alone information-processing device having a screen, a target, an image-acquisition system provided with a means for determining an inclination of the image-acquisition system and connected to said screen, and a processor allowing the image-acquisition system to be controlled and the images obtained to be processed, said method comprising the steps of:
adjusting the inclination of the image-acquisition system so that the image-acquisition system remains in a permissible angular range, said image-acquisition system compensating for the inclination, so as to obtain an image of the eyes of the individual, which image is always centered on the screen whatever the inclination of said image-acquisition system in the permissible angular range, the compensating being based on an image-processing software package that selects, in the image obtained by the image-acquisition system in which image the face of the individual appears off-center, a zone around the eyes of the individual and a frame of the spectacles, and moves said zone to the center of said screen;
adjusting a height of the image-acquisition system so that the individual can view the target along a substantially horizontal vision axis;
the individual observing the target with the spectacles occupying a natural position on the face of the individual;
providing an enclosure on the screen, the enclosure appearing on the screen as a rectangle of constant size;
acquiring at least one image of the eyes and of the frame in said observation position by mean of the image-acquisition system, when the eyes and the frame fit inside the enclosure;
processing said at least one image using the processor in order to determine each morpho-geometric parameter of the individual from the position of pupils of the individual and the inclination of the spectacles; and
returning the results of the measurements.

2. The method as claimed in claim 1 , wherein the compensation includes moving each image obtained by the acquisition system to the center of the screen, the direction and the amplitude of movement of each of said images being dependent on the direction of inclination of the acquisition system and on the value of the angle of inclination.

3. The method as claimed in claim 1 , wherein the spectacles of the individual are equipped with a clip provided with at least one marker, and the inclination of the frame is evaluated using a single video camera.

4. The method as claimed in claim 1 , wherein the inclination of the frame is evaluated by means of two video cameras used in stereoscopic mode.

5. The method as claimed in claim 1 , wherein the means for determining the inclination of the image-acquisition system is an inclinometer housed in said system.

6. The method as claimed in claim 1 , wherein the information-processing device is provided with an alarm that is triggered when the angle of inclination of the acquisition system departs from the permissible angular range.

7. The method as claimed in claim 1 , wherein the permissible angular range is plus or minus 10° about a vertical reference position.

8. The method as claimed in claim 1 , wherein the morpho-geometric parameters measured are selected from the group consisting of the height between the pupil and the lower rim of the glass, the pantoscopic angle, the face from the angle of the spectacles and the pupillary distance.

9. The method as claimed in claim 1 , wherein said method is implemented by the spectacle wearing individual, who adjusts the position of the image-acquisition system with reference to the pictures displayed by the screen, and utilizes the processor to trigger the image capture and the processing of said images.

10. The method as claimed in claim 1 , wherein said method is implemented by an optician placed facing the individual, and who utilizes the image-acquisition system to adjust its position in space, and in that the optician guides the individual and uses the processor to trigger the image capture and the processing of said images.

11. The method as claimed in claim 1 , wherein the results of the measurements are displayed on the screen.

12. The method as claimed in claim 1 , wherein said method further includes a step of adjusting the distance between the image acquisition system and the face of the individual, so as to ensure that this distance lies in an acceptable range.

13. An information-processing device for implementing the method as claimed in claim 1 , wherein said device comprises:
a processor,
a target,
at least one video camera equipped with an inclinometer, and
a display screen allowing the pictures taken by said video camera and the results of the measurements to be viewed.

14. The device as claimed in claim 13 , wherein the position of the video camera and the position of the screen may be adjusted independently of each other.

15. The device as claimed in claim 1 , wherein said device includes a tablet combining the screen, a secondary video camera, the inclinometer and the processor, and of said at least one video camera.

16. The method as claimed in claim 1 , wherein the compensation includes moving each image obtained by the acquisition system to the center of the screen, the direction and the amplitude of movement of each of said images being dependent on the direction of inclination of the acquisition system and on the value of the angle of inclination.

Assignees

• Essilor Int

Inventors

• Divo Fabien
• Hasbroucq Gaetan

Classifications

• G02C13/005 Primary

  Measuring geometric parameters required to locate ophtalmic lenses in spectacles frames (apparatus for testing or instruments for examining the eyes per se A61B3/00; machines or devices and accessories for grinding the edges of lenses using spectacles as a template B24B9/144) · CPC title