FR3144914A1 - personalized cosmetic formulation process - Google Patents

Abstract

The invention relates to a method for cosmetic analysis of a face comprising the following steps: - a step (260) for analyzing at least one area of interest of a calibrated image (203), called the area of interest interest analyzed, the analysis step (260) comprising a step (261) of measuring at least one measurand (301, 302, 303, 304, 305, 306, 307) on the analyzed area of interest; - a step (263) of determining an intermediate score (351, 352, 353, 354, 355, 356, 357) determined for at least one of the at least one measurand (301, 302, 303, 304, 305 , 306, 307); - a step (270) of determining an overall score (400), obtained for each at least one measurand (301, 302, 303, 304, 305, 306, 307); - a step (290) of formulating a cosmetic (500) comprising a step of choosing a base, at least one active ingredient and at least one amplifier together forming the cosmetic formulation, the amplifier being chosen in temporal data function. Figure to be published with the abstract: Fig. 2

Description

custom cosmetic formulation process

The technical context of the present invention is that of products intended to be applied to the skin of a person. More particularly, the invention relates to a method of personalized cosmetic formulation following a cosmetic diagnosis.

The definition of a cosmetic product best suited to a person's skin involves a precise and complete examination of the person's skin in the area of their body on which the cosmetic product is intended to be applied, in order to deduce a certain number of parameters characteristic of this skin. Generally, a visual examination, possibly supplemented by an oral interview with the person concerned, makes it possible to identify and know the aforementioned parameters: as non-exhaustive examples, visual defects of the skin, feelings of discomfort, etc. …

Once this examination has been carried out, the professional suggests one or more products and/or mixtures of products that he has defined as being able to meet the person's needs.

The aim of the present invention is to propose a simple and effective solution for defining an optimal composition of one or more cosmetic products to be applied to the skin of a person's face based on a precise and complete examination of this skin.

To achieve its aim, the invention relates, according to a first aspect, to a method for selecting at least one amplifier producing a cosmetic effect on a user's face, the selection method comprising a step of selecting the at least one amplifier from a plurality of amplifiers listed in a database, the at least one amplifier being chosen as a function of temporal data relating to the user.

In general, the at least one selected amplifier is of the type of an active ingredient having a concentration higher than that of the active ingredients used subsequently in a cosmetic preparation and associated with a base. Each amplifier can be chosen from those of the type of a therapeutic active ingredient or a preventive active ingredient. In the context of the invention, an amplifier of the type of a therapeutic active ingredient is an active ingredient that will make it possible to reduce a deficiency or a defect in the skin of the user's face. Conversely, an amplifier of the type of a preventive active ingredient produces an effect on the skin of the face that tends to limit or even prevent the occurrence or development of a future defect.

The time data used to select the at least one amplifier include a date of birth and/or a date of the day of use of the selection method according to the first aspect of the invention. Taking into account the date of the day for selecting a cosmetic amplifier and the subsequent preparation of a cosmetic formulation thus makes it possible to extremely personalize the cosmetic formulation and to apply to the face an amplifier particularly suited to the date of the day and/or the date of birth. In particular, taking into account the date of the day makes it possible to select the most relevant active ingredients from a database containing numerous active ingredients, classified according to their formulations, their positive associations, their negative associations, their therapeutic efficacy, their preventive efficacy and their efficacy according to the day of birth, the month of birth, the year of birth and the date of the day. It is now possible to create a tailor-made cosmetic formulation by taking into account temporal data and the user's state of mind or health, depending on the date of the day and their history.

The at least one amplifier is chosen based on the user's year of birth. For this purpose, the active ingredients and bases classified in the database on which the present method is based are also listed according to an effectiveness rating reported according to the year of birth. The choice of the active ingredient(s) will thus be weighted by this effectiveness rating during the cosmetic formulation.

The at least one amplifier is chosen based on the user's day of birth. For this purpose, the active ingredients and bases classified in the database on which the present method is based are also listed according to an efficacy rating reported based on the day of birth. The choice of the active ingredient(s) will thus be weighted by this efficacy rating during the cosmetic formulation.

The at least one amplifier is chosen based on the user's month of birth. For this purpose, the active ingredients and bases classified in the database on which the present method is based are also listed according to an efficacy rating reported according to the day of birth. The choice of the active ingredient(s) will thus be weighted by this efficacy rating during the cosmetic formulation.

The at least one amplifier is chosen based on a time of birth of the user. More particularly, time of birth means the hours and minutes of the time of birth. For this purpose, the active ingredients and bases classified in the database on which the present method is based are also listed according to an efficacy score reported according to the time of birth. The choice of the active ingredient(s) will thus be weighted by this efficacy score during the cosmetic formulation.

The at least one amplifier is chosen based on the user's place of birth. For this purpose, the active ingredients and bases classified in the database on which the present method is based are also listed according to an efficacy rating reported according to the place of birth. As a non-limiting example, the place of birth may be a continent, a geographical region, a country, a national region, a city. The choice of the active ingredient(s) will thus be weighted by this efficacy rating during the cosmetic formulation.

The at least one amplifier is chosen according to a place of use of the method according to the invention. For this purpose, the active ingredients and bases classified in the database on which the present method is based are also listed according to an efficacy rating reported according to the place of use. As a non-limiting example, the place of use may be a continent, a geographical region, a country, a national region, a city. The choice of the active ingredient(s) will thus be weighted by this efficacy rating during the cosmetic formulation.

The at least one amplifier is selected based on a local weather of the place of use of the selection method according to the first aspect of the invention. In particular, the at least one amplifier is selected based on a humidity and/or a temperature and/or a pressure and/or a sunshine and/or a precipitation level of a predetermined place which may be the place of use of the method according to the first aspect of the invention or a place provided by the user of said method according to the first aspect of the invention.

Each at least one amplifier comprises one or two active ingredients – called concentrated active ingredients – having a concentration higher than that used for the cosmetic formulation, in combination with the base. More generally, each at least one amplifier comprises at least one concentrated active ingredient in order to be able to combine, in synergy, several different active ingredients. In an advantageous but non-limiting manner, each at least one amplifier comprises at most 4 different concentrated active ingredients, in order to limit negative interference between them. In other words, for a given active ingredient, the concentration of the active ingredient present in the corresponding amplifier is higher than the concentration of said given active ingredient in said active ingredient used in the cosmetic formulation. Thus, the active ingredients used in the at least one amplifier which completes the cosmetic formulation – the base and the at least one active ingredient – have a concentration higher than that of the active ingredients used in the rest of the cosmetic formulation.

In the case where each at least one amplifier comprises two concentrated active ingredients, the concentrated active ingredients are chosen from those exhibiting synergy when combined together. The synergy is determined based on the positive association parameter read between two distinct active ingredients. A significant positive association thus reflects good synergy between two given active ingredients, while a weak positive association reflects less good synergy. In addition, a negative association reflects incompatibility between two given active ingredients.

Similarly, in the case where several amplifiers are chosen, then the concentrated active ingredients chosen for each amplifier are preferentially chosen from those exhibiting synergy when combined together.

More particularly, the at least one amplifier is selected based on the previously mentioned temporal data and/or the user's place of birth. This advantageous configuration makes it possible to personalize the cosmetic formulation based on data complementary to the physiological analysis of the face.

– the selection method in accordance with the first aspect of the invention comprises a step of entering information relating to a user of said method, the entry step being carried out via a human-machine interface making it possible to record in the database a user profile comprising in particular an age and gender of said user, a place of birth and a date of birth.

– the at least one amplifier selected during the selection step is determined according to the user profile, a quantity of each selected concentrated active ingredient being recommended by the method according to the invention, through a recommendation step during which a predetermined quantity of concentrated active ingredient is recommended, typically less than 10 drops. More generally, a recommended quantity is, for each active ingredient present in each at least one amplifier, less than 10 drops.

According to a second aspect, the invention also proposes a method for cosmetic analysis of a user's face, the method comprising the following steps:

- a step of analyzing at least one area of interest of a calibrated image obtained from a step of acquiring a raw image of the face, called the analyzed area of interest, the analysis step comprising a step of measuring at least one measurand on the analyzed area of interest;

- a step of determining an intermediate score determined for at least one of the at least one measurand determined for each area of interest analyzed;

- a step of determining an overall score, obtained for each at least one measurand and resulting from a weighted combination of each at least one intermediate score on all the areas of interest analyzed;

- a step of formulating a cosmetic comprising a step of choosing a base chosen as a function of (i) the at least one intermediate score and/or the at least one overall score and (ii) an amplifier selected from the selection method in accordance with the first aspect of the invention or according to any of its improvements, the base and the at least one amplifier together forming the cosmetic formulation.

In the context of the invention, the calibrated image can be obtained by any means. It can be available from a remote server or stored on a local hard drive, or it can be obtained directly by an optical sensor during an acquisition step, for example via a photographic sensor or a video sensor.

In the case of the acquisition of one or more images by such an optical sensor, called raw images, the raw image(s) can be processed before carrying out the analysis step.

Advantageously, the optical sensor used to perform the acquisition step is associated with a mirror allowing a user to view his face. Advantageously, the optical sensor, whether it is a photographic sensor or a video sensor, is incorporated in such a mirror, preferably at an upper edge located beyond, with reference to a vertical axis V, a line of the user's eyes.

Furthermore, it should also be understood here that a measurand is understood to mean a characteristic parameter of the skin of the user's face, i.e. a quantified indicator representative of a visual characteristic of the skin of the user's face: as a non-exclusive example, a measurand may be defined to represent a presence or absence of wrinkles on the skin of the user's face.

According to an exemplary implementation of the invention, the database in which the raw image is stored or made available is located locally, close to the optical sensor. According to another exemplary implementation of the invention, this database is located remotely, for example on a remote server. In this case, the invention provides that the optical sensor is connected to such a remote server by any means of communication, wired or wireless.

According to a characteristic of the method according to the invention, in the case where the raw image needs to be processed before it can be analyzed, during a preprocessing step, then the preprocessing step advantageously comprises a step of calibrating the raw image, the raw image being resized so that the face contained in said raw image, delimited by the contours of the face, is contained in a rectangle of predetermined dimensions, preferably equal to 900 pixels on a side.

At the end of this calibration step, the recorded raw images therefore have identical digital dimensions, thus making the measurands determined on each area of interest during the analysis step comparable.

According to another characteristic of the invention, the method may comprise a step of delimiting the areas of interest of the face in order to divide said face into several areas on which the analysis step will be successively carried out. Such a delimitation step comprises an identification of several points of interest on the face contained in the standardized raw image at the end of the operations described above.

More specifically, the points of interest include points of interest whose position on the normalized image is determined, for example, by means of a neural network previously trained to identify such first points of interest on reference images. As non-exhaustive examples, the points of interest are located at the level of an eye contour, a nose bridge, nostrils, the lip contour and the face contour.

The points of interest make it possible to define the areas of interest, previously mentioned, of the standardized image, and it follows from the above that the areas of interest include:

- a first area of interest located at the level of the forehead of the face contained in the standardized image, the first area of interest being delimited by the points of interest located around the forehead,

- a second area of interest located at the level of each eye of the face contained in the standardized image, the second area of interest being delimited by the points of interest located around each eye,

- a third area of interest located at the level of the nose of the face contained in the standardized image, the third area of interest being delimited by the points of interest located around the nose,

- a fourth area of interest located at the level of the cheeks of the face contained in the standardized image, the fourth area of interest being delimited by the points of interest located around each cheek of the face,

- a fifth area of interest located between the upper lip and the nose of the face contained in the standardized image, the fifth area of interest being delimited by the points of interest located between the upper lip and the nose,

- a sixth area of interest located at the level of the chin of the face contained in the standardized image, the sixth area of interest being delimited by the points of interest located around the chin,

- a seventh area of interest located at the level of the mouth of the face contained in the standardized image, the sixth area of interest being delimited by the points of interest located between the cheeks and the chin, the seventh area of interest being located in an intermediate position between, on the one hand, the sixth area of interest and, on the other hand, the fourth area of interest and the fifth area of interest,

- an eighth area of interest located between the contour of the emptying contained in the standardized image and each eye, the eighth area of interest being located in an intermediate position between the contour of the face and the second area of interest.

At the end of the preprocessing step, we therefore have a standardized image of a user's face, a standardized image in which several areas of interest are defined to be analyzed to define the desired cosmetic profile. Such an image is referred to below as a calibrated image.

Advantageously, the analysis step includes a step of comparing each analyzed area of interest with reference images stored in a reference database, the comparison step making it possible to quantify differences between each at least one measurand of the analyzed area of interest with a reference quantity determined from the reference images.

According to other characteristics of the invention:

– the analysis step comprises a step of analyzing wrinkles on at least one of the areas of interest, the wrinkle analysis step comprising a step of detecting the wrinkles present on each at least one area of interest by measuring the variations in point contrast on the area of interest considered, in order to determine at least one continuous trace of said variations in contrast greater than a contrast threshold. According to one example, the continuous trace characterizing each wrinkle detected on the area of interest considered is determined on the basis of a Frangi filter and implements Hessian-type matrices. Advantageously, the areas of interest more particularly concerned by this wrinkle analysis step comprise at least the first area of interest and/or the eighth area of interest previously defined.

– the measuring step comprises a step of measuring the wrinkles comprising a step of measuring a length and/or a width and/or a depth of each at least one continuous trace determined previously and representative of at least one wrinkle detected in one of the areas of interest.

– the step of determining at least one intermediate score comprises a step of determining an intermediate wrinkle score comprising a step of counting a number of wrinkles having a thickness greater than a second threshold, preferably equal to 0.9 mm.

More generally, the invention advantageously provides that the step of determining the intermediate wrinkle score comprises:

– a step of counting a number of wrinkles having a thickness less than a first threshold, preferably equal to 0.5 mm, a number of wrinkles having a thickness greater than a second threshold, preferably equal to 0.9 mm, and a number of wrinkles having a thickness between the first threshold and the second threshold,

- a step of determining an average length of wrinkles,

- a step of determining a maximum length of wrinkles,

- a step of determining an average surface area of wrinkles,

- a step of determining a maximum surface area of wrinkles.

The method according to the invention thus makes it possible to carry out, on the face of a user, a complete and precise analysis of the skin of this user, in connection with the presence of wrinkles.

The method according to the invention also makes it possible to carry out such a complete and precise analysis of the face of such a user, in relation to other measurands of the user's skin.

Thus, according to other characteristics of the invention:

– the analysis step comprises a brightness analysis step on at least one of the areas of interest, the brightness analysis step comprising a step of determining a chroma of an analysis region over the entire at least one area of interest. The analysis region is here preferably a circular region with a diameter of less than 10 pixels, preferably equal to 3 pixels. The areas of interest more particularly concerned by this brightness analysis step comprise at least the first area of interest and/or the third area of interest and/or the fourth area of interest and/or the fifth area of interest and/or the sixth area of interest and/or the seventh area of interest and/or the eighth area of interest previously defined.

– the measuring step comprises a brightness measuring step comprising a step of determining a standard deviation of the chroma values determined for each analysis region covering the entire at least one area of interest.

– the step of determining at least one intermediate score comprises a step of determining an intermediate brightness score determined by a percentage of the analysis regions of each area of interest having a standard deviation greater than a threshold value.

According to other characteristics of the method according to the invention:

– the analysis step comprises a roughness analysis step on at least one of the areas of interest, the roughness analysis step comprising a step of detecting the skin grains present on each at least one of the areas of interest by measurement, the skin grains being detected by measuring the point contrast variations on the area of interest considered in order to determine at least one closed contour of said contrast variations greater than a contrast threshold. Advantageously, the contrast threshold is preferably between 0.15 and 0.30. The areas of interest more particularly concerned by this roughness analysis step comprise all or part of the areas of interest of the calibrated image, with the exception of the second area of interest.

– the measuring step comprises a roughness measuring step comprising a step of counting the number of closed contours determined previously.

– the step of determining at least one intermediate score comprises a step of determining an intermediate roughness score comprising a step of determining a ratio between a total surface area of the closed contours and a total surface area of the face contained in the calibrated image.

According to other characteristics of the invention for another measurand:

– the analysis step comprises a step of analyzing redness on at least one of the areas of interest, the redness analysis step comprising a step of detecting a hue of each pixel of each at least one of the areas of interest by measurement. The areas of interest more particularly concerned by this redness analysis step preferably comprise the fourth area of interest and/or the seventh area of interest, previously defined, of the calibrated image.

– the measuring step comprises a redness measuring step comprising a step of measuring an angular deviation of the hue determined for each pixel relative to a reference color. According to the invention, the selected reference color is a pure red, and the angular deviation is determined in the color space designated by the English acronym HSV (Hue, Saturation, Value) of the reference image. More specifically, the invention provides that the hue determined during the redness analysis step corresponds to the dimension H of the aforementioned HSV color space.

– the step of determining at least one intermediate score comprises a step of determining an intermediate redness score comprising, for each area of interest, a step of counting a number of pixels having a hue located beyond a threshold angular distance from the reference color, divided by the total number of pixels in the area of interest considered.

According to other characteristics of the invention for another measurand:

– the analysis step comprises a step of analyzing buttons on at least one of the areas of interest, the button analysis step comprising a step of detecting buttons present on each at least one of the areas of interest by means of a neural network configured to calculate, for each pixel of the area of interest, a probability of the presence of a button, the neural network having been trained to recognize such buttons on reference images showing buttons. The areas of interest more particularly concerned by this button analysis step comprise at least the first area of interest and/or the third area of interest and/or the fourth area of interest.

– the measurement step comprises a step of measuring the buttons comprising a step of determining a percentage of pixels presenting, for a given area of interest, a probability of the presence of a button greater than a reference threshold.

– the step of determining at least one intermediate score comprises a step of determining an intermediate button score comprising a step of calculating an average value of the probability of button presence greater than the reference threshold.

According to other characteristics of the invention for another measurand:

– the analysis step comprises a task analysis step on at least one of the areas of interest, the task analysis step comprising a step of detecting the tasks present on each at least one of the areas of interest by filtering. The areas of interest more particularly concerned by this task analysis step comprise at least the first area of interest and/or the third area of interest and/or the fourth area of interest and/or the sixth area of interest and/or the seventh area of interest and/or the eighth area of interest.

– the measurement step includes a task measurement step comprising a step of measuring the number of tasks analyzed and a step of measuring a surface area of each task analyzed.

– the step of determining at least one intermediate score comprises a step of determining an intermediate task score comprising a step of normalizing a total surface area of all the tasks analyzed by a surface area of all the areas of interest in which at least one task has been analyzed.

According to other characteristics of the method according to the invention for other measurands, taken separately or in combination:

- the analysis step comprises a gloss analysis step on at least one of the areas of interest, the gloss analysis step comprising a step of detecting a hue of each pixel of each at least one of the areas of interest by measurement. The areas of interest more particularly concerned by this gloss analysis step comprise the fourth area of interest, the sixth area of interest and the seventh area of interest of the calibrated image.

– the measuring step comprises a brightness measuring step comprising a step of measuring a distance between the hue determined for each pixel and a reference color. Advantageously, the chosen reference color is a reference white, and the distance is determined in the LAB color space of the reference image.

– the step of determining at least one intermediate score comprises a step of determining an intermediate brightness score comprising, for each area of interest, a step of counting a number of pixels having a hue located beyond a threshold distance from the reference color, divided by the total number of pixels in the area of interest considered.

As mentioned previously, all of these measurands can be analyzed on all or part of the areas of interest defined previously, in order to be able to carry out a complete cosmetic diagnosis highlighting several characteristics of the facial skin identified in the image.

Subsequently, the method comprises a step of determining an overall score resulting from a weighted combination of each at least one intermediate score; and/or the method comprises a step of ranking all the intermediate scores calculated previously.

Additionally:

– the base selection step also includes the selection of at least one asset;

- the step of choosing the base and at least one active ingredient is carried out with regard to the most important intermediate scores determined previously, the at least one active ingredient and the base being selected by means of a reference table establishing the effectiveness of each base and each active ingredient for each type of analysis carried out.

- during the formulation stage, the at least one selected active ingredient contains at most 3 different active ingredients.

– the at least one selected active ingredient is chosen from a therapeutic or preventive active ingredient. In the context of the invention, a therapeutic active ingredient is an active ingredient that will reduce a deficiency or defect detected in one of the areas of interest, the deficiency or defect detected being considered as the detected measurand and being greater than the corresponding reference value, as described for each type of analysis carried out and described above. Thus, the therapeutic active ingredient will produce an effect on the skin that, in the long term, will tend to make the corresponding measurand lower than the associated reference value. In the context of the invention, the preventive active ingredient produces an effect on the skin of the face that tends to limit or even prevent a given measurand from being exceeded in relation to the associated reference value.

- the formulated cosmetic contains 3, 6 or 9 drops for each at least one selected amplifier.

– the analysis method comprises a step of entering information relating to a user of the method, the entry step being carried out via a human-machine interface making it possible to record in the database a user profile comprising in particular an age and gender of said user, a place of birth and a date of birth.

– the at least one active and at least one base selected during the selection step is determined based on the user profile, a quantity of each at least one active and each at least one base selected being determined based on the user profile and for each of the three most important intermediate scores determined previously.

By the method as just described, the invention achieves the aim it set for itself, by proposing a complete and precise solution, on the one hand, by carrying out a precise analysis of the skin of a user's face and, on the other hand, by defining a cosmetic product formulation specifically adapted according to the results of the aforementioned analysis.

According to a third aspect, the invention also relates to a cosmetic recommendation system, comprising at least one mirror, an optical shooting device, and a control unit comprising a microcontroller configured to implement the method in accordance with the second aspect of the invention and as described above.

According to various examples, the optical shooting device may be a photographic device or a shooting camera.

Other characteristics and advantages of the invention will become apparent from the description which follows on the one hand, and from several examples of embodiment given for information purposes and without limitation with reference to the attached schematic drawings on the other hand, in which:

schematically illustrates a cosmetic recommendation system according to the invention,

schematically illustrates an analysis method in accordance with the second aspect of the invention;

schematically illustrates a method of selecting at least one amplifier according to the first aspect of the invention.

Of course, the features, variants and different embodiments of the invention may be combined with each other, in various combinations, to the extent that they are not incompatible or mutually exclusive. In particular, it will be possible to imagine variants of the invention comprising only a selection of features described below in isolation from the other features described, if this selection of features is sufficient to confer a technical advantage or to differentiate the invention from the prior art.

In particular, all variants and embodiments described can be combined with each other if there is no technical obstacle to this combination.

In FIGURES, elements common to several FIGURES retain the same reference.

In reference to the , a cosmetic recommendation system 100 according to the invention comprises a mirror 101 equipped with a shooting device 102 configured to capture one or more images of the face of a user 150 placed in front of the mirror 101. According to different exemplary implementations, the shooting device 102 may be a photographic device or a camera configured to capture a video stream of the face of the user 150.

Regardless of the mode of implementation of the cosmetic recommendation system 100, the invention provides that the image-taking device 102 is advantageously placed beyond, in a vertical direction, a line connecting the pupils of the eyes of the user 150. In other words, the invention provides that the image-taking device 102 is advantageously placed substantially facing a region covering the eyebrows and/or the forehead of the user 150.

In the cosmetic recommendation system according to the invention, the image capture device 102 is connected to a control unit 103 comprising, on the one hand, a unit 104 configured to record and store the raw images captured by the image capture device 102, and, on the other hand, a calculation unit 105 configured to implement the different steps of the method according to the invention.

According to various examples of implementation of the invention, the control unit 103 can be placed in the vicinity of the mirror 101 carrying the image-taking device 102, or it can be placed remotely, for example on a remote server. In all cases, the connection between the image-taking device 102 and the control unit 103 can be made by wired or wireless means.

There schematically illustrates the different stages of the method according to the invention.

The process involves:

- a step 260 of analyzing at least one area of interest, called analyzed area of interest, of a calibrated image 203 obtained from a step 200 of acquiring a raw image 201 of the face, the analysis step 260 comprising a step 261 of measuring at least one measurand 301, 302, 303, 304, 305, 306, 307 on the analyzed area of interest;

- a step 263 of determining an intermediate score 351, 352, 353, 354, 355, 356, 357 determined for at least one of the at least one measurand 301, 302, 303, 304, 305, 306, 307 determined for each zone of interest analyzed;

- a step 270 of determining an overall score 400, obtained for each at least one measurand 301, 302, 303, 304, 305, 306, 307 and resulting from a weighted combination of each at least one intermediate score 351, 352, 353, 354, 355, 356, 357 over all the areas of interest analyzed;

- a step 290 of formulating a cosmetic 500 comprising a step of choosing a base chosen as a function of (i) the at least one intermediate score and/or the at least one overall score and (ii) an amplifier AMP1, AMP2, AMP3, AMPn, AMPi selected from a selection method 100 in accordance with the first aspect of the invention and as described below with reference to the , the base and at least one amplifier AMP1, AMP2, AMP3, AMPn, AMPi together forming the cosmetic formulation.

The analysis of the calibrated image 203 comprises, according to the invention, the analysis of a certain number of measurands in the different areas of interest. As indicated previously, each measurand is a parameter whose value is representative of a characteristic of the skin of the user's face taken into account for the cosmetic recommendations sought.

In accordance with the method according to the invention as described in this document, several measurands are advantageously taken into account:

– a first measurand 301 relates to the presence of wrinkles on the skin of the user's face,

– a second measurand 302 relates to a skin burst,

– a third measurand 303 is representative of skin roughness,

– a fourth measurand 304 relates to redness of the skin,

– a fifth measurand 305 is representative of the presence of pimples on the skin,

– a sixth measurand 306 is representative of the presence of spots on the skin,

– a seventh measurand is representative of skin shine.

And, for each aforementioned measurand, the invention provides that the analysis step 260 comprises:

– a step 261 of detection of the measurand considered,

– a step 262 of measuring the measurand considered,

– a step 263 of calculation and assignment of an intermediate score to the measurand considered.

Depending on the measurand considered, step 261 of detecting the measurand may include different operations and relate to different previously defined areas of interest. Thus:

– for the first measurand 301 representative of the presence of wrinkles, the detection step 261 implements a measurement of contrast variations and aims to determine at least one continuous line along which the contrast variations are greater than a previously defined threshold, such a continuous line being representative of a wrinkle. According to the invention, such a continuous line determined on the basis of a Frangi filter and implements Hessian matrices, and the areas of interest more particularly concerned by the detection step 261 comprise at least the first area of interest, located at the forehead of the user 150, and/or the third area of interest located on the nose of the user 150 (in particular the upper area of the nose, between the eyebrows), and/or the eighth area of interest, located on the outer contour of the eyes.

– for the second measurand 302 representative of a skin glow, the detection step 261 comprises an operation of defining a chroma of a preferably circular analysis region, the diameter of which is less than 10 pixels, preferably of the order of 3 pixels, and the areas of interest more particularly concerned by the detection step 261 advantageously comprise all the areas of interest with the exception of the second area of interest located around the eyes.

– for the third measurand 303 representative of a roughness of the skin, the detection step 261 implements a measurement of contrast variation in order to determine at least one closed contour within which the contrast variations are greater than a previously defined threshold, for example between 0.15 and 0.30, and the areas of interest more particularly concerned by the detection step 261 advantageously comprise all the areas of interest with the exception of the second area of interest located around the eyes.

– for the fourth measurand 304 representative of a redness of the skin and for the seventh measurand 307 representative of a shine of the skin, the detection step 261 comprises an operation of detecting the hue of each pixel of the area of interest considered. For the fourth measurand 304, the areas of interest more particularly concerned by the detection step 261 comprise at least the fourth area of interest, located at the cheeks of the user 150, and/or the sixth area of interest located at the chin of the user 150, and/or the seventh area of interest, located at the mouth of the user 150. For the seventh measurand 307, the areas of interest more particularly concerned by the detection step 261 comprise at least the fourth area of interest, located at the cheeks of the user 150, and/or the sixth area of interest located on the chin of the user 150 (in particular the upper area of the nose, between the eyebrows), and/or the seventh area of interest, located on and around the mouth of the user 150.

– for the fifth measurand 305 representative of the presence of pimples, the detection step 261 advantageously implements a neural network previously trained to detect pimples on a set of reference images, and the areas of interest more particularly concerned by the detection step 261 comprise at least the first area of interest, located at the forehead of the user 150, and/or the third area of interest located on the nose of the user 150 (in particular the upper area of the nose, between the eyebrows), and/or the fourth area of interest, located at the cheeks of the user 150.

– for the sixth measurand 306 representative of the presence of spots on the skin, the detection step 261 implements a filtering operation of the calibrated image 203 to deduce the presence of spots, and the areas of interest more particularly concerned by the detection step 261 advantageously comprise all the areas of interest with the exception of the second area of interest, located around the eyes, and the fifth area of interest, located between the bottom of the nose and the upper lip of the user 150.

Similarly, depending on the measurand considered, the measurement step 262 varies. Thus:

- for the first measurand 301, the measuring step 262 comprises an operation of measuring a length and/or a width and/or a depth of each at least one continuous trace previously described, detected during the prior detection step 261,

– for the second measurand 302, the measurement step 262 comprises a determination of a standard deviation of the chroma values determined for each analysis region on the zone(s) of interest considered,

– for the third measurand 303, the measurement step 262 comprises an operation of counting the closed contours detected during the detection step 261,

– for the fourth measurand 304, the measurement step 262 comprises an operation of measuring an angular deviation, in the HSV color space of the calibrated image 203, of the hue determined for each pixel during the detection step 261 relative to a pure red.

– for the fifth measurand 305, the measurement step 262 comprises a determination of a percentage of pixels presenting, for a given area of interest, a probability of presence of a button greater than a previously defined threshold.

– for the sixth measurand 306, the measurement step 262 comprises an operation of counting the tasks detected during the detection step 261, as well as an operation of measuring a surface of the detected tasks.

– for the seventh measurand 307, the measurement step 262 comprises an operation of measuring a distance, in the colorimetric space LAB of the calibrated image 203, between the hue determined for each pixel during the detection step 261 and a reference white.

Finally, step 263 of calculating and assigning an intermediate score to each measurand has various aspects depending on the measurand considered:

– for the first measurand 301, the step 263 of calculating and assigning an intermediate score 351 advantageously comprises an operation of counting the wrinkles whose width is greater than a first threshold, preferably equal to 0.9 millimeters, an operation of counting the wrinkles whose width is less than a second threshold, preferably equal to 0.5 millimeters, an operation of counting the wrinkles whose width is between the first threshold and the second threshold mentioned above, as well as different operations of calculating a maximum length, an average length, a maximum surface area and an average surface area of the wrinkles detected during the detection step 261 and measured during the measurement step 262,

– for the second measurand 302, the step 263 of calculating and assigning an intermediate score 352 includes determining a percentage of the regions analyzed in each area of interest concerned having a standard deviation greater than a previously defined threshold,

- for the third measurand 303, the step 263 of calculating and assigning an intermediate score 353 comprises a determination of a ratio between a total surface area of the closed contours measured during the measurement step 261 and a total surface area of the face contained in the calibrated image 203,

- for the fourth measurand 304 and for the seventh measurand 307, the step 263 of calculating and assigning an intermediate score 354, 357, comprises an operation of counting the pixels whose hue is located beyond a threshold distance previously defined in relation to, respectively, the pure red or the pure white reference, as well as an operation of calculating a ratio between the number of pixels thus determined and the total number of pixels in the area of interest considered,

- for the fifth measurand 305, the step 263 of calculating and assigning an intermediate score 355 comprises an operation of calculating an average value of the probability of the presence of a button greater than a previously defined reference threshold,

- for the sixth measurand 306, the step 263 of calculating and assigning an intermediate score 356 comprises an operation of calculating a total surface area of the detected and measured tasks, as well as an operation of calculating a ratio between said total surface area and a total surface area of all the areas of interest in which at least one task has been detected and measured.

At the end of the analysis step 260 as just described, we therefore have, for each measurand 301, …, 307, an intermediate score 351, …, 357, representative of a number of occurrences, a frequency and a location, on the face of the user 150, of the characteristics of the skin represented by these measurands.

The next step of the method according to the invention is a step 270 of determining an overall score 400 of the skin of the face of the user 150. More precisely, the overall score 400 is a weighted combination of the intermediate scores 351, …, 357, attributed to each measurand 301, …, 307. Advantageously, different general information relating to the user 150 can be taken into account in such a weighting: as non-exhaustive examples, we can cite an age of the user 150, a color of his skin, the gender of the user 150, a known skin disease, the existence of skin allergies, etc. … Advantageously, this information is entered by the user himself or by an authorized third party in a database grouping together different user profiles of the system according to the invention.

Advantageously, the formulation step 290 of a cosmetic 500 comprises a step of choosing a base, at least one active ingredient and at least one amplifier AMP1, AMP2, AMP3, AMPn, AMPi selected by means of the selection method 100 according to the invention, the base, the at least one active ingredient and the at least one amplifier AMP1, AMP2, AMP3, AMPn, AMPi together forming the cosmetic formulation.

The base and the at least one active ingredient are chosen based on the at least one intermediate score 351, …, 357 assigned to each measurand 301, …, 307 and/or the overall score 400 assigned based on each measurand 301, …, 307. As mentioned above, the bases and active ingredients recommended and used by the method to establish the cosmetic formulation are chosen from a reference table establishing the effectiveness of each base and each active ingredient for each measurand 301, …, 307 analyzed. It should be noted that the at least one base and the at least one active ingredient are also advantageously selected based on the general information contained in the user profile mentioned above.

The invention, as just described, therefore makes it possible to define, for each user, a personalized cosmetic formulation adapted to the characteristics and specific problems of the skin on their face.

In reference to the , the invention addresses a method 100 for selecting at least one amplifier AMP1, AMP2, AMP3, AMPn, AMPi producing a cosmetic effect on a user's face, the selection method 100 comprising a step of selecting the at least one amplifier AMP1, AMP2, AMP3, AMPn, AMPi from a plurality of amplifiers AMP1, AMP2, AMP3, AMPn, AMPi listed in a database, the at least one amplifier AMP1, AMP2, AMP3, AMPn, AMPi being chosen as a function of DTP time data relating to the user.

The at least one amplifier AMP1, AMP2, AMP3, AMPn, AMPi is chosen based on DTP time data, and possibly on the at least one intermediate score 351, …, 357 assigned to each measurand 301, …, 307. The at least one amplifier AMP1, AMP2, AMP3, AMPn, AMPi thus makes it possible to amplify the treatment of one of the characteristics of the skin, characterized through the measurands 301, …, 307 determined during the analysis step 260. The at least one amplifier AMP1, AMP2, AMP3, AMPn, AMPi is in particular selected from a reference table establishing the effectiveness of each active ingredient for each measurand 301, …, 307 analyzed.

According to a particular characteristic of the invention, the at least one amplifier AMP1, AMP2, AMP3, AMPn, AMPi is selected according to a temporal data DTP which can be chosen from:

– a date of the day of implementation of the method, in order to take into account the ephemeris in the care provided to the skin. The date of the day can be determined by an internal clock in the cosmetic recommendation system 100 or determined via a remote server. Furthermore, the active ingredients and/or amplifiers AMP1, AMP2, AMP3, AMPn, AMPi entered in the reference table are also qualified according to the date of the day. In other words, each active ingredient and/or each amplifier AMP1, AMP2, AMP3, AMPn, AMPi stored in the reference table has an effectiveness indicator for each calendar day, in order to be able to adapt the selection of active ingredient and/or amplifier AMP1, AMP2, AMP3, AMPn, AMPi according to the date of the day; and/or

– a day of birth of the user of the method according to the invention. The day of birth can be entered in a user profile and stored in the memory of the cosmetic recommendation system 100 or available on a remote server. Furthermore, the active ingredients and/or amplifiers AMP1, AMP2, AMP3, AMPn, AMPi entered in the reference table are also qualified according to the day of birth. In other words, each active ingredient and/or each amplifier AMP1, AMP2, AMP3, AMPn, AMPi stored in the reference table has an effectiveness indicator for each calendar day, in order to be able to adapt the selection of active ingredient and/or amplifier AMP1, AMP2, AMP3, AMPn, AMPi according to the day of birth. Alternatively or additionally, each active ingredient and/or each amplifier AMP1, AMP2, AMP3, AMPn, AMPi stored in the reference table presents an efficiency indicator for each day of the week; and/or

– a month of birth of the user of the method according to the invention. The month of birth can be entered in a user profile and stored in the memory of the cosmetic recommendation system 100 or available on a remote server. Furthermore, the active ingredients and/or amplifiers AMP1, AMP2, AMP3, AMPn, AMPi entered in the reference table are also qualified according to the month of birth. In other words, each active ingredient and/or each amplifier AMP1, AMP2, AMP3, AMPn, AMPi stored in the reference table has an effectiveness indicator for each calendar month, in order to be able to adapt the selection of active ingredient and/or amplifier AMP1, AMP2, AMP3, AMPn, AMPi according to the month of birth of the user; and/or

– a year of birth of the user of the method according to the invention The year of birth can be entered in a user profile and stored in the memory of the cosmetic recommendation system 100 or available on a remote server. Furthermore, the active ingredients and/or amplifiers AMP1, AMP2, AMP3, AMPn, AMPi entered in the reference table are also qualified according to the year of birth. In other words, each active ingredient and/or each amplifier AMP1, AMP2, AMP3, AMPn, AMPi stored in the reference table has an effectiveness indicator for each year, in order to be able to adapt the selection of active ingredient and/or amplifier AMP1, AMP2, AMP3, AMPn, AMPi according to the year of birth of the user; and/or

– a place of birth of the user of the method according to the invention. The place of birth can be entered in a user profile and stored in the memory of the cosmetic recommendation system 100 or available on a remote server. Furthermore, the assets and/or amplifiers AMP1, AMP2, AMP3, AMPn, AMPi entered in the reference table are also qualified according to a given geographical area. The geographical area can be taken at the scale of a city, an administrative region, a country, a continental region or a continent. In other words, each asset and/or each amplifier AMP1, AMP2, AMP3, AMPn, AMPi stored in the reference table has an effectiveness indicator for each geographical area, in order to be able to adapt the selection of asset and/or amplifier AMP1, AMP2, AMP3, AMPn, AMPi according to the location of birth of the user; and/or

– meteorological data of the place of use of the method according to the invention or those of a place provided by the user or predetermined by any means. The meteorological data include humidity and/or temperature and/or pressure and/or sunshine and/or precipitation level.

Of course, the invention is not limited to the examples that have just been described and many adjustments can be made to these examples without departing from the scope of the invention. In particular, the different characteristics, variants and embodiments of the invention can be associated with each other in various combinations to the extent that they are not incompatible or mutually exclusive. In particular, all the variants and embodiments described above can be combined with each other. In addition, the measurands mentioned in this document are not cited as limiting or exhaustive, and other measurands can be taken into account, without detracting from the invention.

Claims (10)

A method (100) for selecting at least one amplifier (AMP1, ... AMPi, ... AMPn) producing a cosmetic effect on a user's face, the selection method (100) comprising a step of selecting the at least one amplifier (AMP1, ... AMPi, ... AMPn) from a plurality of amplifiers (AMP1, ... AMPi, ... AMPn) listed in a database, the at least one amplifier (AMP1, ... AMPi, ... AMPn) being chosen based on temporal data (100) relating to the user, the selection method (100) comprising a step of entering information relating to a user of said method, the entry step being carried out via a human-machine interface making it possible to record in the database a user profile comprising in particular an age and a sex of said user, a place of birth and a date of birth. Selection method (100) according to the preceding claim, in which the time data (100) used to select the at least one amplifier (AMP1, ... AMPi, ... AMPn) include a date of birth and/or a date of the day of use of the method. Selection method (100) according to the preceding claim, in which the at least one amplifier (AMP1, ... AMPi, ... AMPn) is chosen according to a year of birth of the user. Selection method (100) according to any one of claims 2 or 3, in which the at least one amplifier (AMP1, ... AMPi, ... AMPn) is chosen according to a day of birth of the user. Selection method (100) according to any one of claims 2 to 4, in which the at least one amplifier (AMP1, ... AMPi, ... AMPn) is chosen according to a time of birth of the user. Selection method (100) according to any one of the preceding claims, in which the at least one amplifier (AMP1, ... AMPi, ... AMPn) is chosen according to a place of birth of the user. Selection method (100) according to any one of the preceding claims, in which the formulated cosmetic comprises 3, 6 or 9 drops of each at least one amplifier (AMP1, ... AMPi, ... AMPn) selected. A method of cosmetic analysis of a user's face, the method comprising the following steps:
- a step (260) of analyzing at least one area of interest of a calibrated image (203) obtained from a step (200) of acquiring a raw image (201) of the face, called the analyzed area of interest, the analysis step (260) comprising a step (261) of measuring at least one measurand (301, 302, 303, 304, 305, 306, 307) on the analyzed area of interest;
- a step (263) of determining an intermediate score (351, 352, 353, 354, 355, 356, 357) determined for at least one of the at least one measurand (301, 302, 303, 304, 305, 306, 307) determined for each zone of interest analyzed;
- a step (270) of determining an overall score (400), obtained for each at least one measurand (301, 302, 303, 304, 305, 306, 307) and resulting from a weighted combination of each at least one intermediate score (351, 352, 353, 354, 355, 356, 357) on all of the areas of interest analyzed;
- a step (290) of formulating a cosmetic (500) comprising a step of choosing a base chosen as a function of (i) the at least one intermediate score (351, 352, 353, 354, 355, 356, 357) and/or the at least one overall score (400), and (ii) at least one amplifier (AMP1, ... AMPi, ... AMPn) selected from the selection method (100) according to any one of the preceding claims, the base and the at least one amplifier (AMP1, ... AMPi, ... AMPn) together forming the cosmetic formulation, the step of choosing the base and the at least one active ingredient being carried out with regard to the most important intermediate scores determined previously, the at least one active ingredient and the base being selected by means of a reference table establishing an effectiveness of each base and each active ingredient for each type of analysis carried out. Method according to claim 8, in which, during the formulation step (290), the at least one selected active ingredient comprises at most 3 different active ingredients. Method according to any one of claims 8 or 9, in which the at least one selected active ingredient is chosen from an active ingredient of therapeutic type or of preventive type.