Method for determining an optical parameter of a lens

Patent metadata

Field	Value
Publication number	US-11262273-B2
Application number	US-201816955431-A
Country	US
Kind code	B2
Filing date	Dec 20, 2018
Priority date	Dec 21, 2017
Publication date	Mar 1, 2022
Grant date	Mar 1, 2022

Abstract

A method implemented by computer means for determining at least one optical parameter of a lens of eyewear adapted for a person, the method comprising: —an image reception step, during which at least a first image and a second image are received, the first image comprising a front view of the face of the person with at least one part of an eye of the person being directly visible, and the second image comprising a front view of the face of the person with said part of the eye of the person being visible through at least part of the lens, and —an optical parameter determination step, during which at least one optical parameter of the lens is determined based on a comparison between said part on the first and the second image.

First claim

The invention claimed is:

1. A method implemented by computer means for determining at least one optical parameter of a lens of eyewear adapted for a person, the method comprising:
an image reception step, during which at least a first image and a second image are received, the first and second images are depth maps comprising depth information, the first image and the second image each comprise a front view of a face of the person with at least one part of an eye of the person being visible, and said part of the eye of the person is visible through at least part of the lens on the second image,
an optical parameter determination step, during which first and second image data are extracted from respective depth information and compared together to determine at least one optical parameter of the lens.

2. The method according to claim 1 , wherein during the image reception step,
the first image comprises a front view of the face of the person with at least one part of an eye of the person being directly visible, and
the second image comprises a front view of the face of the person with said part of the eye of the person being visible through at least part of the lens.

3. The method according to claim 1 , wherein during the image reception step,
the first image and the second image both comprise a front view of the face of the person with at least one part of an eye of the person being visible through at least part of the lens,
the first image corresponds to a first eye-lens distance between the lens and said part of the eye,
the second image corresponds to a second eye-lens distance between the lens and said part of the eye, and
the second eye-lens distance is different from the first eye-lens distance.

4. The method according to claim 1 , further comprising:
a first image acquisition step, during which the first image is acquired by a portable electronic device comprising an image acquisition module,
a lens positioning step, during which the lens is positioned relatively to said part of the eye of the person at a position corresponding to the second image, and
a second image acquisition step during which the second image is acquired by the portable electronic device comprising the image acquisition module.

5. The method according to claim 4 , further comprising prior to the first image acquisition step:
a first lens positioning step, during which the lens is positioned relatively to said part of the eye of the person at a position corresponding to the first image.

6. The method according to claim 4 , wherein during the image reception step, a third image is received, the third image comprising a side view of the face of the person, wearing the eyewear, wherein said part of the eye of the person is directly visible.

7. The method according to claim 6 , wherein during the image reception step, a fourth image is received, the fourth image comprising a side view of the face of the person, wherein the person is wearing the eyewear.

8. The method according to claim 7 , further comprising:
acquiring a fifth image including a view of the eyewear positioned on a flat surface along with an object with at least one known dimension by a portable electronic device comprising an image acquisition module,
acquiring the third image comprising the side view of the face of the person, wearing the eyewear, wherein said part of the eye of the person is directly visible, by the portable electronic device,
a fourth image acquisition step for acquiring the fourth image comprising the side view of the face of the person, wherein the person is wearing the eyewear, by the portable electronic device.

9. The method according to claim 1 , wherein said part of the eye includes iris or pupil.

10. The method according to claim 1 , wherein on the first image, an object with at least one known dimension, such as a credit card, is positioned in the same plane as said part of the eye of the person.

11. The method according to claim 10 , further including:
a scaling step, during which, when the person wears the eyewear,
a distance between said part of the eye of the person and the lens, and
the distance from which the lens is seen on at least one image received during the image reception step
are determined relatively to at least one known dimension,
and wherein during the parameter determination step, the at least one optical parameter of the lens is determined based on
the distance between said part of the eye of the person and the lens, and
the distance from which the lens is seen on at least one image received during the image reception step.

12. The method according to claim 1 , wherein on the second image, an object of at least one known dimension, such as a credit card, is positioned in a plane tangent to the lens at a reference point chosen on the front surface of said lens.

13. The method according to claim 1 , wherein during the image reception step, a third image is received, the third image comprising a view of the eyewear positioned on a flat surface along with an object with at least one known dimension.

14. A method for ordering a lens of eyewear adapted for a person, comprising:
an optical parameter determining step, during which at least one optical parameter of the lens is determined by the method according to claim 1 , and
an ordering step, during which an lens having the at least one determined optical parameter is ordered.

15. A system comprising at least a receiver, an electronic storage medium, and a processor,
the receiver, the electronic storage medium and the processor being configured to communicate one with another,
the receiver being able to receive a first and a second image,
the first image is a depth map comprising depth information and comprising a front view of the face of a person with part of an eye of the person being directly visible, and
the second image is a depth map comprising depth information and comprising a front view of the face of the person with said part of the eye of the person being visible through at least part of a lens, and
the electronic storage medium comprising one or more stored sequences of instructions which, when executed by the processor, are able to perform an optical parameter determination step, during which first and second image data are extracted from respective depth information and compared together to determine at least one optical parameter of a lens.

Assignees

• Essilor Int

Inventors

• Gueu Stephane
• Andoche Julien
• Tang Daniel

Classifications

• G02C13/003 Primary

  Measuring during assembly or fitting of spectacles · CPC title

• G01M11/0228 Primary

  by measuring refractive power · CPC title

• G06F18/22

  Matching criteria, e.g. proximity measures · CPC title

• G01M11/0285

  by measuring material or chromatic transmission properties (G01M11/0292 takes precedence) · CPC title

• G01M11/0207

  Details of measuring devices · CPC title