Method for selecting a cosmetic product for an intended user

• US 11,058,208 B2
• Filed: 04/05/2019
• Issued: 07/13/2021
• Est. Priority Date: 04/13/2018
• Status: Active Grant

• Current Assignee: Chanel Parfums Beaute (Chanel SAS)
• Original Assignee: Chanel Parfums Beaute (Chanel SAS)
• Inventors: Lassalle, Astrid, Couderc, Sandrine
• Primary Examiner(s): Vu, Kim Y
• Assistant Examiner(s): Bloom, Nathan J
• Application Number:
  US16/376,312
• Publication Number:
  US 20190318505A1
• Time in Patent Office: 830 Days
• Field of Search: None
• CPC Class Codes: A45D 2044/007 Devices for determining the condition of hair or skin or for selecting the appropriate cosmetic or hair treatment
• CPC Class Codes: A45D 44/005 for selecting or displaying personal cosmetic colours or hairstyle
• CPC Class Codes: G01J 2003/466 Coded colour; Recognition of predetermined colour; Determining proximity to predetermined colour
• CPC Class Codes: G01J 3/0208 using focussing or collimating elements, e.g. lenses or mirrors; performing aberration correction
• CPC Class Codes: G01J 3/0264 Electrical interface; User interface
• CPC Class Codes: G01J 3/0278 Control or determination of height or angle information for sensors or receivers
• CPC Class Codes: G01J 3/0289 Field-of-view determination; Aiming or pointing of a spectrometer; Adjusting alignment; Encoding angular position; Size of measurement area; Position tracking
• CPC Class Codes: G01J 3/462 Computing operations in or between colour spaces; Colour management systems
• CPC Class Codes: G01J 3/463 Colour matching
• CPC Class Codes: G01J 3/50 using electric radiation detectors
• CPC Class Codes: G01J 3/524 Calibration of colorimeters
• CPC Class Codes: G06Q 30/0268 at point-of-sale [POS]
• CPC Class Codes: G06Q 30/0631 Item recommendations
• CPC Class Codes: G06T 2207/10024 Color image
• CPC Class Codes: G06T 2207/30201 Face
• CPC Class Codes: G06T 7/90 Determination of colour characteristics
• CPC Class Codes: G06V 10/56 relating to colour
• CPC Class Codes: G06V 40/161 Detection; Localisation; Normalisation
• CPC Class Codes: G06V 40/162 using pixel segmentation or colour matching
• CPC Class Codes: G06V 40/166 using acquisition arrangements

Abstract

Disclosed is a method for selecting a cosmetic product, and a method for image acquisition and image processing for the selection method, including: acquiring an image of a person in a controlled lighting environment, and measuring and recording the colorimetric coordinates of the person'"'"'s face; processing the image to determine an absolute value of the skin tone; correlating the absolute value with a usage color map established for each of multiple cosmetic products of a database by measuring the color of each cosmetic product under its conditions of use, and to determine a personalized color matrix; extracting, from the database, the cosmetic product(s) whose color measurement is part of the personalized color matrix; using an information medium, presenting the product(s) included in the personalized color matrix; and optionally selecting the preferred product(s) chosen by the person from those that are part of the personalized color matrix.

Claims

1. A method for selecting a cosmetic product intended for a person, the method comprising:

acquiring an image of a person in a controlled lighting environment, and measuring and recording colorimetric coordinates of part or all of a face of the person, the acquiring the image of the person comprising capturing the image of the person by capturing a complete view of a face of the person in the controlled lighting environment that is controlled by

a standardized light source configured to provide a uniform lighting environment around the person who is the subject of image acquisition, said standardized light source being positioned wholly or partly facing the person,

an image capture device comprising a lens, placed at a distance of between 20 cm and 50 cm from the face of the person, and

an image calibration device that is a test pattern captured in another image in the controlled lighting environment and at a same distance from the lens as the face of the person;

processing said image by a standardized system in order to determine an absolute value of a skin tone of said person, the processing the image comprising analyzing colorimetric parameters L_i and h_i by digital processing each of some or all of pixels of the face, and using the average of each of the colorimetric parameters L_i and h_i to determine the absolute value of the color of said face designated by values L_m and h_m, the analyzing the colorimetric parameters L_i and h_i comprising

obtaining a distribution diagram D_L of the pixels of the image along the L axis between 0 and 100 and a distribution diagram D_h of the pixels of the image along the h axis between −

15° and

105°

;

correlating said absolute value of the skin tone of said person with a usage color map established for each of a plurality of cosmetic products of a database by measuring a color of each cosmetic product under conditions of use, to determine a personalized color matrix;

extracting, from said database, one or more of the cosmetic products having a color measurement that is part of the personalized color matrix; and

using an information medium selected among a paper document and a digital interface, presenting to the person the one or more products comprised in the personalized color matrix.

2. The method of selecting according to claim 1, wherein

the lens is placed at a distance of between 25 cm and 35 cm, from the face of the person.

3. The method of selecting according to claim 2, wherein the lighting environment is further controlled by a gaze tracking device configured to control, during image capture, the actual distance of the face of the person from the image capture device.

4. The method of selecting according to claim 1, wherein the usage color map is obtained for each cosmetic product by

spreading a homogeneous film of constant thickness of the cosmetic product on a reference medium,

drying each resulting film at a temperature between 20°

C. and 45°

C., and

measuring the colorimetric parameters L_f and h_f of each dried resulting film by a spectrophotometer and under standardized lighting conditions identical or almost identical to lighting conditions used in the acquiring the image of the person, and

wherein the correlating the absolute value of the skin tone of the person with the usage color map comprises;

positioning values L_m and h_m of the absolute value of the skin tone of the person within a color space of the usage color map defined by a set of L_f/h_f pairs measured for each cosmetic product,

selecting the L_f/h^f pairs for which the Δ

L absolute difference between Lm and each Lf is equal to ±

10, and the Δ

h absolute difference between hm and each hf is between 0° and

90°

, and

determining the personalized color matrix of the person that is within the color space in the L and h coordinates resulting from the selecting.

5. The method of selecting according to claim 1, wherein the correlating further comprises:

integrating at least one of a personal preference criteria of the person, among a group consisting of;

a desired makeup effect,

more or less coverage,

a dewy or matte effect,

a natural or layered effect,

a choice of facial area not to be taken into account in the measurement of facial colorimetric data, and

a color rendering, and

taking one or more of the distribution diagrams D_L and D_h into account in order to eliminate areas of dispersion in variations of L and h of the different pixels.

10. The method of selecting according to claim 4, wherein the Δ

L absolute difference between L_m and each L_f is equal to ±

5.

11. The method of selecting according to claim 4, wherein the Δ

h absolute difference between h_m and each h_f is between 0° and

50°

.

12. The method of selecting according to claim 11, wherein the Δ

h absolute difference between h_m and each h_f is between 0° and

20°

.

6. A method for determining an absolute value of a skin tone of a person, the method comprising:

capturing an image of the person by capturing a complete view of a face of the person in a controlled lighting environment;

analyzing colorimetric parameters L_i and h_i, by

digital processing, each of some or all of pixels of the face, and using the average of each of the colorimetric parameters L_i and h_i to determine the absolute value of the color of said face designated by values L_m and h_m, and

obtaining a distribution diagram D_L of the pixels of the image along the L axis between 0 and 100 and a distribution diagram D_h of the pixels of the image along the h axis between −

15° and

105°

,

wherein the capturing the image of the person is performed using;

a standardized light source configured to provide a uniform lighting environment around the person who is the subject of image acquisition, said standardized light source being positioned wholly or partly facing the person,

an image capture device comprising a lens, placed at a distance of between 20 cm and 50 cm from the face of the person, and

an image calibration device that is a test pattern captured in another image in the controlled lighting environment and at a same distance from the lens as the face of the person.

7. The method according to claim 6, wherein

the lens is placed at a distance of between 25 cm and 35 cm, from the face of the person and.

13. The method of selecting according to claim 7, wherein the Δ

h absolute difference between h_m and each h_f is between 0° and

50°

.

14. The method of selecting according to claim 13, wherein the Δ

h absolute difference between h_m and each h_f is between 0° and

20°

.

8. An image processing method, the method comprising:

determining the absolute value of a skin tone of the person;

measuring a color of the plurality of cosmetic products under conditions of use and under standardized lighting conditions in order to obtain a usage color map; and

correlating the absolute value of the skin tone of the person with the usage color map in order to determine a personalized color matrix by

positioning values L_m and h_m of the absolute value of the skin tone of the person within a color space of the usage color map defined by a set of L_f/h_f pairs,

selecting the L_f/h_f pairs for which a Δ

L absolute difference between L_m and each L_f is equal to ±

10, and an Δ

h absolute difference between h_m and each h_f is between 0° and

90°

, and

determining the personalized color matrix corresponding to the color space in the L and h coordinates resulting from the selecting.

9. The method according to claim 8, wherein

the Δ

L absolute difference between L_m and each L^f is equal to ±

5.