METHOD FOR DETERMINING AT LEAST ONE VALUE OF A PARAMETER FOR CUSTOMISING A VISUAL COMPENSATION DEVICE

• US 20160124249A1
• Filed: 06/03/2014
• Published: 05/05/2016
• Est. Priority Date: 06/07/2013
• Status: Active Grant

• Current Assignee: Essilor International SA
• Original Assignee: Essilor International SA
• Inventors: HADDADI, Ahmed, DIVO, Fabien, BERTHEZENE, Marie-Anne, POULAIN, Isabelle, PETIGNAUD, Cecile, LEVRAUD, Loic, GAYAT, Sebastien, ROUSSEAU, Beanjamin
• Granted Patent: US 9,703,122 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: A61B 3/0025 characterised by electronic signal processing, e.g. eye models
• CPC Class Codes: A61B 3/0033 characterised by user input arrangements
• CPC Class Codes: A61B 3/0041 characterised by display arrangements
• CPC Class Codes: A61B 3/0091 Fixation targets for viewing direction
• CPC Class Codes: A61B 3/111 for measuring interpupillary distance
• CPC Class Codes: A61B 3/113 for determining or recording eye movement
• CPC Class Codes: A61B 3/145 by video means
• CPC Class Codes: G02C 13/003 Measuring during assembly or fitting of spectacles
• CPC Class Codes: G02C 13/005 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

Abstract

A method for determining at least one value of a customisation parameter for a visual compensation device includes the following steps: a) a user (1) equipped with an electronic terminal (2) captures at least one image or video sequence; b) telecommunicating the at least one image to a remote-support centre (22); c) processing the at least one image in order to derive therefrom an instruction to correct or validate the captured image or video sequence; d) telecommunicating the correction or validation instruction from the remote-assistance centre (22) to the terminal (2) of the user (1); e) displaying or emitting an audio or video message using the terminal; f) repeating the preceding steps until a validated image or video sequence is obtained; g) determining a value of the at least one customisation parameter.

Claims

1. A method for determining at least one value of a personalization parameter of a piece of vision-correcting equipment for a user, employing an electronic terminal comprising a graphical interface, an image capturing apparatus comprising an image sensor, and audiovisual communication means, the method comprising the following steps:

a) capturing at least one image or video sequence of the user by means of the image capturing apparatus;

b) communicating said at least one image or video sequence captured in step a) to a remote-assistance center located remotely from the electronic terminal, the remote-assistance center comprising at least one checking terminal;

c) checking processing, by the remote-assistance center, of said at least one image or video sequence transmitted in step b), in order to deduce therefrom, on account of a position, a posture or a sequence of movements of the user in front of the image capturing apparatus, a captured image or video sequence correction or validation instruction;

d) communicating from the remote-assistance center to the electronic terminal of the user said correction or validation instruction;

e) the electronic terminal displaying or emitting a video or audio message informing the user of the validation of the image or video sequence capture or requesting the user to position or move himself relative to the image capturing apparatus in accordance with the correction instruction;

f) reiterating the preceding steps until a validated image or video sequence is obtained; and

g) determining at least one value of said personalization parameter depending on said captured and validated at least one image or video sequence.

2. The method as claimed in claim 1, in which said at least one personalization parameter comprises one of the following parameters:

an interpupillary distance or left or right monocular pupillary distance parameter;

a user face shape parameter;

a user posture parameter;

a dynamic behavioral parameter of the user;

a centration parameter of a corrective lens in a spectacle frame;

a parameter characterizing the position of the pupillary centers or CRE of the eyes in a frame of reference associated with the frame;

a vertex parameter, for example a lens-eye distance;

a parameter characterizing the position or inclination of the frame or of the piece of equipment or of the lens in a face or environment frame of reference, for example a face form angle or a pantoscopic angle; and

adjustment parameters of the frame in a face frame of reference.

3. The method as claimed in claim 1, in which, in step d), the remote-assistance center delivers a validation instruction if said at least one image or video sequence is good enough to at least contribute to determining the value of the sought personalization parameter, or delivers a correction instruction in the contrary case, respectively.

4. The method as claimed in claim 1, in which in step d), the remote-assistance center delivers a correction instruction to correct a centration position of the eyes in front of the image capturing apparatus, a posture of the user, a sequence of movements of the user relative to the image sensor of the image capturing apparatus, or compliance with a protocol presented by the terminal and to be executed by the wearer in order to obtain a validated image.

5. The method as claimed in claim 1, in which:

during the reiteration of steps a) to e), the correction instructions delivered by the remote-assistance center are such that the messages delivered to the user lead him to adopt a series of ocular fixations or ocular pursuits and/or a series of postures in which the Frankfurt plane and/or sagittal plane of the user are oriented at a predefined angle to the optical axis of the image capturing apparatus, or to comply with and execute a protocol presented by the terminal in order to obtain a validated image; and

step a) comprises the image capturing apparatus taking a video recording of a video sequence of the user in the remotely validated series of postures.

6. The method as claimed in claim 5, in which the series of postures of the user in front of the image capturing apparatus is such that the Frankfurt plane and the sagittal plane of the user make to the optical axis of the image capturing apparatus an angle smaller than a predefined threshold and in which in step g), an interpupillary distance or a monocular pupillary distance is calculated.

7. The method as claimed in claim 1, in which in step d), the audio-video remote-assistance comprises communicating to the user rescaling instructions including capturing at least one image of an element of known size, preferably placed in proximity to the eyes of the user, or capturing an image representative of the interpupillary distance of a user whose interpupillary distance is already known, or measuring a known reading distance in order to correct convergence, or even capturing an image of a frame having at least one predefined geometrical dimension.

8. The method as claimed in claim 1, in which step d) of audio-video remote-assistance comprises the following substeps:

a step in which the remote-assistance center transmits to the graphical interface of the terminal of the user a video stream or a known image; and

a step of capturing an image of the face or at least one eye of the user in response to this video stream or this known image.

9. The method as claimed in claim 1, in which step g) comprises verifying a value of a geometric adjustment parameter of a spectacle frame by comparing said determined value with a reference value.

10. The method as claimed in claim 1, in which step g) comprises measuring reading distance or gaze direction/by how much the head is lowered.

11. The method as claimed in claim 1, in which the messages emitted by the terminal in step e) comprise a request for the user to rotate his head about a horizontal axis and/or about a vertical axis and in which the processing of said at least one image or captured video sequence comprises detecting in the image a notable point of the ear of the user such as the tragion.

12. The method as claimed in claim 1, in which:

in step a) during the capture of at least one image or video sequence, the user is equipped with a spectacle frame;

the messages emitted by the terminal allow the user to be guided into at least one first posture in which the sagittal plane is aligned with the axis of the image capturing apparatus and at least one second posture in which the sagittal plane makes a nonzero angle to the axis of the image capturing apparatus; and

the images or video sequences are validated in these two postures.

13. The method as claimed in claim 1, comprising an additional step of selecting a language for the user from a plurality of languages, and in which, a set of validation and user guidance messages being recorded, each message is informationally tied to its audiovisual implementation in each of the languages of the plurality of languages, the message being delivered by the terminal to the user in correspondence with the instruction delivered by the remote-assistance center and in the language selected by the user.

14. The method as claimed in claim 1, in which step c) of processing, by the remote-assistance center, of said at least one image or video sequence transmitted in step b) and/or step d) of communicating, from the remote-assistance center to the electronic terminal of the user, said correction or validation instruction, is carried out by an automated system.

15. The method as claimed in claim 1, in which step c) of processing, by the remote-assistance center, of said at least one image or video sequence transmitted in step b) and/or step d) of communicating, from the remote-assistance center to the electronic terminal of the user, said correction or validation instruction, is carried out by an optician possessing a digital signature.

16. The method as claimed in claim 5, in which in step d), the audio-video remote-assistance comprises communicating to the user rescaling instructions including capturing at least one image of an element of known size, preferably placed in proximity to the eyes of the user, or capturing an image representative of the interpupillary distance of a user whose interpupillary distance is already known, or measuring a known reading distance in order to correct convergence, or even capturing an image of a frame having at least one predefined geometrical dimension.

17. The method as claimed in claim 5, in which step d) of audio-video remote-assistance comprises the following substeps:

a step in which the remote-assistance center transmits to the graphical interface of the terminal of the user a video stream or a known image; and

a step of capturing an image of the face or at least one eye of the user in response to this video stream or this known image.

18. The method as claimed in claim 5, in which step g) comprises verifying a value of a geometric adjustment parameter of a spectacle frame by comparing said determined value with a reference value.

19. The method as claimed in claim 5, in which step g) comprises measuring reading distance or gaze direction/by how much the head is lowered.

20. The method as claimed in claim 5, in which the messages emitted by the terminal in step e) comprise a request for the user to rotate his head about a horizontal axis and/or about a vertical axis and in which the processing of said at least one image or captured video sequence comprises detecting in the image a notable point of the ear of the user such as the tragion.