METHOD FOR SELECTING A COSMETIC PRODUCT FOR AN INTENDED USER

• US 20190318505A1
• Filed: 04/05/2019
• Published: 10/17/2019
• Est. Priority Date: 04/13/2018
• Status: Active Grant

• Current Assignee: Chanel Parfums Beaute (Chanel SAS)
• Original Assignee: Chanel Parfums Beaute (Chanel SAS)
• Inventors: LASALLE, Astrid, COUDERC, Sandrine
• Granted Patent: US 11,058,208 B2
• Time in Patent Office: Days
• 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. Method for selecting a cosmetic product intended for a person, comprising the steps of:

acquiring (100) an image of a person in a controlled lighting environment, and measuring and recording the colorimetric coordinates of part or all of the face of that person;

processing said image by standardized means in order to determine (200) an absolute value of the skin tone of said person;

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 the color of each cosmetic product under its conditions of use, to determine (300) a personalized color matrix (MTP);

extracting (410), from said database, the cosmetic product(s) whose color measurement is part of the personalized color matrix;

using an information medium selected among a paper document and a digital interface, presenting (420) to the person the product(s) comprised in the personalized color matrix.

2. Selection method according to claim 1, wherein the step (100) of acquiring an image of the person comprises a step of capturing (110) an image of the person, said capture comprising a complete view of the person'"'"'s face in a controlled lighting environment, and the step of processing (200) the image comprises analyzing (210) the colorimetric parameters L_i and h_i by means of digital processing, of each of some or all of the pixels of the face, and using the average of each of the L_i and h_i to determine the absolute value of the color of said face designated by L_m, h_m.

3. Selection method according to claim 2, wherein the analysis of the colorimetric parameters further comprises obtaining the distribution diagram (D_L) of the pixels of the image along the L axis between 0 and 100 and the distribution diagram (D_h) of the pixels of the image along the h axis between −

15° and

105°

.

4. Selection method according to claim 3, wherein the lighting environment is controlled by the use of means (1) comprising:

a standardized light source (10) able to provide a uniform lighting environment around the person who is the subject of the image acquisition, said light source being positioned wholly or partly facing the person;

an image capture device (20), comprising a lens, placed at a distance of between 20 cm and 50 cm, or at a distance of between 25 cm and 35 cm, from the person'"'"'s face; and

an image calibration device (30) such as a test pattern, said pattern being captured in an image in the same controlled lighting environment and at the same distance from the lens as that of the person'"'"'s face.

5. Selection method according to claim 4, wherein the lighting environment is further controlled by the use of a gaze tracking device (40) adapted to control, during image capture, the actual distance of the person'"'"'s face from the image capture device.

6. Selection method according to claim 1, wherein the usage color map is obtained for each cosmetic product, by

spreading (910) a homogeneous film of constant thickness of the cosmetic product on a reference medium,

drying (920) each resulting film at a temperature between 20°

C. and 45°

C., and

measuring (930) the colorimetric parameters Lf and hf of each film obtained in the preceding step, by means of a spectrophotometer and under standardized lighting conditions identical or almost identical to those used in the step of acquiring an image of the person,

and wherein the step of correlating (300) the absolute value of the person'"'"'s skin tone with the usage color map comprises the following steps;

positioning (310) the values L_m and hm_i of the absolute value of the person'"'"'s skin tone within the color space of the usage color map defined by the set of L_f/h_f pairs measured for each cosmetic product;

selecting (320) the L_f/h_f pairs for which the Δ

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

10, and preferably ±

5, and the Δ

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

90°

, and preferably between 0° and

50°

, and more preferably between 0° and

20°

,

determining (330) the person'"'"'s personalized color matrix that is within the color space in the L and h coordinates resulting from the previous selection step.

7. Selection method according to claim 1, wherein the correlation step (300) further comprises:

a step (340) of integrating at least one of the person'"'"'s personal preference criteria, 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,

a color rendering; and

/or

a step (350) of taking distribution diagrams (D_L) or (D_h) into account in order to eliminate areas if dispersion in the variations of L and h of the different pixels, particularly in the case where the person'"'"'s face has imperfections or irregularities in the color of the face.

8. A method for determining an absolute value of the skin tone of a person, characterized in that it comprises the following steps:

a step of capturing (100) an image of the person, said capture comprising a complete view of the person'"'"'s face in a controlled lighting environment and,

a step of analyzing (210) the colorimetric parameters L_i and h_i, by means of digital processing, of each of some or all of the pixels of the face, and using the average of each of the L_i and h_i to determine the absolute value of the color of said face designated by L_m and h_m.

9. The method according to claim 8, wherein the step of analyzing the colorimetric parameters further comprises obtaining the distribution diagram (D_L) of the pixels of the image along the L axis between 0 and 100 and the distribution diagram (D_h) of the pixels of the image along the h axis between −

15° and

105°

.

10. The method according to claim 9, wherein the step of capturing (100) the image of the person is performed using:

a standardized light source (10) able to provide a uniform lighting environment around the person who is the subject of the image acquisition, said light source being positioned wholly or partly facing the person;

an image capture device (20), comprising a lens, placed at a distance of between 20 cm and 50 cm, or at a distance of between 25 cm and 35 cm, from the person'"'"'s face; and

an image calibration device (30) such as a test pattern, said pattern being captured in an image in the same controlled lighting environment and at the same distance from the lens as the person'"'"'s face.

11. Image processing method, characterized in that it comprises:

a step of determining (200) the absolute value of the person'"'"'s skin tone,

a step of measuring the color of the plurality of cosmetic products under conditions of use and under standardized lighting conditions in order to obtain a usage color map (900), and

a step of correlating (300) the absolute value of the person'"'"'s skin tone with the usage color map in order to determine a personalized color matrix.

12. Method according to claim 11, wherein the step of correlating (300) the absolute value of the person'"'"'s skin tone with the usage color map comprises the following steps:

Positioning (310) the values L_m and h_m of the absolute value of the person'"'"'s skin tone within the color space of the usage color map defined by the set of L_f/h_f pairs;

selecting (320) the L_f/h_f pairs for which the Δ

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

10, and preferably ±

5, and the Δ

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

90°

, and preferably between 0° and

50°

, and more preferably between 0° and

20°

, and

determining (330) the person'"'"'s personalized color matrix corresponding to the color space in the L and h coordinates resulting from the previous selection step.

13. A method (900) of determining a usage color map of a cosmetic product, comprising:

a step (910) of spreading, as a homogeneous film of constant thickness, the cosmetic product on a reference medium;

a step of drying (920) the resulting film at a temperature between 20°

C. and 45°

C.;

a step of measuring (930) the colorimetric parameters L_f and h_f of the film obtained in the preceding step, by means of a spectrophotometer and under standardized lighting conditions;

each pair of points L_f/h_f representing the usage color map of each of the plurality of cosmetics and the set of pairs of points L_f/h_f forming, without restricting, the color space of the usage map.