# US 2019/0318505 A1 · Method for selecting a cosmetic product for an intended user

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- Number: US 2019/0318505 A1
- Document ID: US20190318505A1
- Status: Published application
- Kind: A1
- Application number: 16/376,312
- Filed: 2019-04-05
- Published: 2019-10-17
- Earliest claimed: 2018-04-13
- Assignees: Chanel Parfums Beaute
- Applicants: Chanel Parfums Beaute
- Inventors: Astrid LASALLE; Sandrine COUDERC
- Web page: https://patentgrep.com/patent/US20190318505A1

## CPC

- G06Q 30/0631: {Recommending goods or services}
- A45D 44/005: {for selecting or displaying personal cosmetic colours or hairstyle}
- G01J 3/0208: {using focussing or collimating elements, e.g. lenses or mirrors; performing aberration correction}
- G01J 3/0264: {Electrical interface; User interface}
- G01J 3/0278: {Control or determination of height or angle information for sensors or receivers}
- G01J 3/0289: {Field-of-view determination; Aiming or pointing of a spectrometer; Adjusting alignment; Encoding angular position; Size of measurement area; Position tracking}
- G01J 3/462: {Computing operations in or between colour spaces; Colour management systems}
- G01J 3/463: {Colour matching}
- G01J 3/50: using electric radiation detectors
- G01J 3/524: {Calibration of colorimeters}
- G06Q 30/0268: {at point-of-sale [POS]}
- G06T 7/90: Determination of colour characteristics
- G06V 10/56: relating to colour
- G06V 40/161: {Detection; Localisation; Normalisation}
- G06V 40/162: {using pixel segmentation or colour matching}
- G06V 40/166: {using acquisition arrangements}
- A45D 2044/007: {Devices for determining the condition of hair or skin or for selecting the appropriate cosmetic or hair treatment}
- G01J 2003/466: {Coded colour; Recognition of predetermined colour; Determining proximity to predetermined colour}
- G06T 2207/10024: Color image
- G06T 2207/30201: Face
- G06Q: INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- A45D: HAIRDRESSING OR SHAVING EQUIPMENT (wigs, toupees or the like A41G3/00, A41G5/00; hairdressers' chairs A47C1/04; hair cutting appliances, razors B26B); EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
- G01J: MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY (light sources F21, H01J, H01K, H05B; investigating properties of materials by optical means G01N)
- G06T: IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06V: IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING

## 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

### Claim 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.

### Claim 2 (depends on 1)

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 Li and hi 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 Li and hi to determine the absolute value of the color of said face designated by Lm, hm.

### Claim 3 (depends on 2)

Selection method according to claim 2, wherein the analysis of the colorimetric parameters further comprises obtaining the distribution diagram (DL) of the pixels of the image along the L axis between 0 and 100 and the distribution diagram (Dh) of the pixels of the image along the h axis between −15° and 105°.

### Claim 4 (depends on 3)

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.

### Claim 5 (depends on 4)

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.

### Claim 6 (depends on 1)

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 Lm and hmi of the absolute value of the person's skin tone within the color space of the usage color map defined by the set of Lf/hf pairs measured for each cosmetic product;
selecting (320) the Lf/hf pairs for which the ΔL absolute difference between Lm and each Lf is equal to ±10, and preferably ±5, and the Δh absolute difference between hm and each hf 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.

### Claim 7 (depends on 1)

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 (DL) or (Dh) 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.

### Claim 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 Li and hi, 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 Li and hi to determine the absolute value of the color of said face designated by Lm and hm.

### Claim 9 (depends on 8)

The method according to claim 8, wherein the step of analyzing the colorimetric parameters further comprises obtaining the distribution diagram (DL) of the pixels of the image along the L axis between 0 and 100 and the distribution diagram (Dh) of the pixels of the image along the h axis between −15° and 105°.

### Claim 10 (depends on 9)

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.

### Claim 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.

### Claim 12 (depends on 11)

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 Lm and hm of the absolute value of the person's skin tone within the color space of the usage color map defined by the set of Lf/hf pairs;
selecting (320) the Lf/hf pairs for which the ΔL absolute difference between Lm and each Lf is equal to ±10, and preferably ±5, and the Δh absolute difference between hm and each hf 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.

### Claim 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 Lf and hf of the film obtained in the preceding step, by means of a spectrophotometer and under standardized lighting conditions;
each pair of points Lf/hf representing the usage color map of each of the plurality of cosmetics and the set of pairs of points Lf/hf forming, without restricting, the color space of the usage map.