Method for determining a scalp type of a user

Abstract

A method (10) for determining the scalp (21) type of a user (20), the method (10) comprising: obtaining a value of a humidity level (111) indicating a region of the scalp (21) of the user (20) and a value of a sebum level (112) indicating the region of the scalp (21) of the user (20); comparing a group including the two values ​​with a reference range of scalp humidity level (111) and sebum level (112), the reference range forming at least five scalp groups (131-135), each scalp group (131-135) being associated with a range of humidity level (111) and a range of sebum level (112), and also associated with a skin and / or hair care composition and / or skin and / or hair care treatment compatible with the same range of humidity level (111) and sebum level (112) of the corresponding category; identifying the scalp (21) type of the user (20) based on the comparison; and outputting the identified scalp (21) type.

Description

Technical Field

[0001] This invention relates to the field of skin and hair care, and more specifically to a method for determining a user's scalp type in order to classify scalp types into groups associated with suitable skin and hair care products or treatment recommendations. More specifically, the object of this invention is to make scalp type determination more objective to avoid misjudgments of scalp conditions that could lead to the selection of unsuitable scalp or hair care products, and to provide greater convenience for the user. Background Technology

[0002] Hair care involves choosing products or treatments that are compatible with a person's hair condition. Damaged hair often requires products that can maintain its structure without causing further damage. Hair care is not separate from skin care, especially scalp care, because scalp condition can have a strong impact on the overall appearance of a person's hairstyle and can contribute to a healthy and attractive look or provide a negative overall impression, such as in cases of redness, oiliness, or the presence of dandruff.

[0003] While the choice of treatments and products for both hair and scalp is relevant, there are no general rules for choosing such products or treatments. Some people typically have higher sebum production on their scalp and will therefore benefit from treatments and products that reduce sebum levels on their scalp, while the opposite is true for others.

[0004] However, it is difficult to accurately assess the condition of a person's scalp because this part of the skin usually requires third-party intervention to examine and is mostly hidden under the hair.

[0005] Visual assessment of a person's scalp condition is often difficult and leads to inaccurate observations. Oiliness and moisture can result in similar visual assessments, although they do not trigger the same treatment recommendations.

[0006] To more accurately assess a user's scalp type, biophysical measurements of skin condition can be used. Typically, electrodes are used to infer moisture levels from measured skin conductivity. Oiliness can be determined as sebum levels using translucent bands that contact the scalp to absorb sebum. The presence of sebum on the bands alters their optically measurable translucency. This measurement provides only a set of raw data that can help assess the true condition of a user's scalp. However, without any means of comparison with other scalps, it is difficult to interpret the individual measurements.

[0007] Document US2019 / 0237194 A1 describes an example of a method for assessing a user's scalp and recommending skincare products. The assessment of scalp type relies on measurements of hydration and sebum, compiled together with further information provided by the user or other supplementary measurements. All provided information is converted into a health score to determine the type of scalp treatment.

[0008] This method requires several inputs from the user to accurately assess their scalp condition. This approach is inconvenient for users who don't have much time to answer questionnaires or simply don't know how to answer questions and add subjective elements to their health assessment.

[0009] In addition, assessing a person's scalp type is a continuous process because scalp conditions change after each shampooing step, which may lead to changes in the hair and / or scalp treatment products or treatments that can be recommended.

[0010] Therefore, we are seeking a simple and objective method for assessing a user's scalp type. Summary of the Invention

[0011] To address the aforementioned needs, the present invention provides a method for determining a user's scalp type, the method comprising:

[0012] Obtain a value indicating the humidity level of the area of ​​the user's scalp;

[0013] Obtain a value indicating the sebum level in the area of ​​the user's scalp;

[0014] The group comprising the obtained values ​​indicating the humidity level and the values ​​indicating the sebum level is compared with reference ranges for scalp hydration and sebum levels, the reference ranges forming at least five scalp groups, each scalp group being associated with a humidity level range and a sebum level range, and each scalp group also being associated with a corresponding category of skin and / or hair care composition and / or skin and / or hair care treatment compatible with the humidity level range and sebum level range;

[0015] Based on the comparison, the user's scalp type is identified in the at least five scalp groups; and

[0016] Output the identified scalp type.

[0017] This invention overcomes the burden of subjectively assessing a user's scalp type through visual observation by providing a simple and objective method for determining that scalp type. This method can be implemented using a portable device and a processor or computer (which may be part of the portable device). To enable this automatic and objective assessment of a user's scalp condition, only two relevant parameters need to be measured: the moisture level and sebum level obtained for the same area of ​​the user's scalp. The applicant notes that there are generally five different scalp types. These types are typically associated with the types of products or treatments best suited to each scalp type. Although the morphological characteristics within each type may be the same, the applicant notes that it is possible to comprehensively describe all five scalp types using specific ranges of moisture and sebum levels. Ranges of moisture and sebum values ​​are obtained on a representative group of users, and the scalp type of these users is further measured using optical and biophysical measurement tools. The obtained sebum and moisture values ​​are plotted in two dimensions, and it is found that the thresholds for each range of sebum and moisture levels match the five scalp types. Each scalp type is characterized by the ability to recommend specific categories of products or treatments for hair or scalp care.

[0018] The method of this invention involves comparing measurements of a user's scalp sebum and moisture levels with ranges defined on a representative group of users. This allows the user to understand the nature of their scalp condition and select appropriate hair or scalp care products and / or hair or scalp treatments.

[0019] According to one implementation, the at least five scalp groups may be established based on data extracted from the scalps of at least one hundred users using at least one of the following:

[0020] The measurement of biophysical parameters of the scalp, including the hydration level and sebum level of each scalp;

[0021] Analysis of scalp features from magnified photographs of the scalps of at least one hundred users.

[0022] Optionally, biophysical parameter values ​​and / or scalp features can be grouped into five clusters based on the similarity of biophysical parameter values ​​and / or scalp features.

[0023] According to one embodiment, at least one of the following can be used to obtain a value indicating the humidity level of the area of ​​the user's scalp and a value indicating the sebum level of the area of ​​the user's scalp:

[0024] The measurement of biophysical parameter values ​​of the area of ​​the user's scalp, including the hydration level and sebum level of the area of ​​the user's scalp;

[0025] Analysis of scalp features from a magnified photograph of the area of ​​the user's scalp.

[0026] According to one embodiment, the measurement of the biophysical parameters of the scalp may include conductivity or resistance measurements on the upper layer of the scalp to obtain hydration levels, and measurements of the translucency changes of an absorbent strip in contact with the scalp to obtain sebum levels.

[0027] It should be noted that "conductivity measurement" is equivalent to "resistance measurement" within the meaning of this invention. It should also be noted that any other alternative methods for measuring sebum or moisture levels can be used, such as relying on an infrared camera or specialized measuring equipment.

[0028] According to one embodiment, the feature on the magnified photograph may include at least one of the following:

[0029] The intensity of light reflected from the area of ​​the scalp;

[0030] The count of dandruff scalp in the magnified photograph;

[0031] The count of red portions in the magnified photograph, where the red portions indicate inflammation on the scalp; and

[0032] The amount of fluorescence emitted from the hair follicles of the scalp,

[0033] Each scalp was photographed under natural light, ultraviolet light, and polarized light conditions.

[0034] Typically, these features can be counted per unit area on an image, and the image can be taken under specific conditions of lighting intensity, viewing angle, or distance to the scalp, or later calibrated to compensate for any differences relative to reference conditions. These counts can be performed on a reference batch of scalps used to set the range of moisture and sebum values ​​for all five scalp groups, and can also be subsequently performed on each scalp to be evaluated.

[0035] According to one implementation, the method may further include:

[0036] The at least five scalp groups are defined based on visual assessments of the dryness and oiliness of the scalps of the at least one hundred users. For each of the at least five scalp groups, the visual assessment corresponds to an assessment of the similarity of the skin and / or hair care compositions and / or skin and / or hair care treatments suitable for the scalp group.

[0037] This alternative approach to defining five scalp groups relies on professional evaluation of the type of product or treatment recommended for a user's scalp. A representative cohort of users is evaluated, and their scalps are grouped based on similarity in the recommendations provided by the professional. This approach can also be combined with biophysical measurements and / or image analysis to adjust the threshold values ​​for each scalp group.

[0038] According to one implementation, the reference range may be established based on data extracted from the scalps of at least one hundred users, and the method further includes, for each of the at least one hundred users:

[0039] Obtain magnified photos of the scalps of at least one hundred users;

[0040] The obtained magnified photographs are grouped according to the defined at least five scalp groups;

[0041] For each of the at least five scalp groups, determine the combination of features found in the grouped magnified photographs of the scalp belonging to that scalp group.

[0042] This method involves a learning process in which features on an image are identified based on scalps that have been classified into each of the at least five scalp groups. This process can be implemented, for example, by the human eye, which counts features on a magnified photograph to determine combinations of features that can be used to match scalps in each scalp group, which has been defined using ranges of humidity and sebum levels.

[0043] According to one implementation, the at least five scalp groups may include:

[0044] The first scalp group corresponds to the hydration level of the upper skin conductivity, which can be measured in the range of 0 μS to 40 μS, and the sebum level, which can be measured in the range of 0 to 20%, is a decrease in the translucency of the sebum-absorbing band membrane in contact with the user's scalp.

[0045] The second scalp group corresponds to the hydration level of the upper skin conductivity, which can be measured in the range of 0 μS to 80 μS, and the sebum level, which can be measured in the range of 20 to 60%, with reduced translucency of the sebum-absorbing band membrane in contact with the user's scalp.

[0046] The third scalp group corresponds to the hydration level of the upper skin conductivity, which can be measured in the range of 0 μS to 80 μS, and the sebum level, which can be measured in the range of 60 to 100%, with reduced translucency of the sebum-absorbing band membrane in contact with the user's scalp.

[0047] The fourth scalp group corresponds to the hydration level of the upper skin conductivity, which can be measured in 40 μS to 80 μS, and the sebum level, which can be measured in 0 to 40% of the reduced translucency of the sebum-absorbing band membrane in contact with the user's scalp.

[0048] The fifth scalp group corresponds to the hydration level of the upper skin with a measurable conductivity of 80 μS or higher and the sebum level with a measurable sebum-absorbing band membrane in contact with the user's scalp with reduced translucency, ranging from 0 to 60%.

[0049] According to one embodiment, the scalp group may further include the following features:

[0050] The first scalp group is associated with a skin and / or hair care composition of the corresponding category comprising 10 to 18% surfactant and having a zein value of less than 0.75;

[0051] The second scalp group is associated with a skin and / or hair care composition of the corresponding category comprising 12 to 20% surfactant and having a zein value of less than 1;

[0052] The third scalp group is associated with skin and / or hair care compositions of the corresponding category that include 14 to 20% surfactant and have a zein value of less than 2.5;

[0053] The fourth scalp group is associated with skin and / or hair care compositions of the corresponding category comprising 10 to 18% surfactants and having a zein value of less than 2; and

[0054] The fifth scalp group is associated with skin and / or hair care compositions of the corresponding category that include 10 to 18% surfactant and have a zein value of less than 1.5.

[0055] According to one embodiment, the scalp group may further include the following features:

[0056] The first scalp group is associated with a corresponding category of skin and / or hair care compositions comprising 0 to 2% anti-dandruff agent;

[0057] The second scalp group is associated with a corresponding category of skin and / or hair care compositions comprising 0 to 2% anti-dandruff agent;

[0058] The third scalp group is associated with skin and / or hair care compositions of the corresponding category, comprising 0 to 1% anti-dandruff agent;

[0059] The fourth scalp group is associated with a corresponding category of skin and / or hair care compositions that do not contain anti-dandruff agents; and

[0060] The fifth scalp group is associated with corresponding categories of skin and / or hair care compositions that do not contain anti-dandruff agents.

[0061] The method of the present invention also relates to a method for recommending skin or hair care products and / or skin or hair care treatments to a user, the method comprising:

[0062] The user's scalp type was determined using the method described above.

[0063] Based on the user's identified scalp type, determine the corresponding category of skin and / or hair care composition and / or skin and / or hair care treatment compatible with the user's identified scalp type's humidity and sebum level ranges; and

[0064] Output the corresponding category of skin and / or hair care composition and / or skin and / or hair care treatment.

[0065] This method can be advantageously implemented using a processor, a portion of a portable device, or a computer. Information regarding skin and / or hair care compositions and / or skin and / or hair care treatments of the category compatible with the range of moisture and sebum levels for the user's scalp type can be stored in a local database or accessed at a remote computer / server or in a cloud environment. The database can also be updated using user feedback or taking into account evolutions and improvements in the matching method described above.

[0066] According to one embodiment, the method for recommending skin or hair care products and / or skin or hair care treatments to a user may further include:

[0067] Obtain a magnified photograph of the area of ​​the user's scalp;

[0068] When the number of red portions above a predetermined threshold is identified in the magnified photograph, a skin and / or hair care composition containing a reduced proportion of surfactants suitable for sensitive scalps is recommended.

[0069] According to one embodiment, the method for recommending skin or hair care products and / or skin or hair care treatments to a user may further include:

[0070] The current value of the humidity level of the area of ​​the user's scalp and the current value of the sebum level of the area of ​​the user's scalp are compared with previously obtained values ​​for the area of ​​the user's scalp.

[0071] When it is determined that the sebum level in the area of ​​the user's scalp is increased, a suggestion is output to increase the frequency of shampooing using hair care products compatible with the user's scalp type;

[0072] When it is determined that the sebum level in the area of ​​the user's scalp is reduced, a recommendation is given to use a hair or scalp care product containing a lower proportion of surfactant.

[0073] In this dynamic process of determining how a user's scalp evolves over time, the appropriate product or treatment recommendations may differ from those typically recommended for a given scalp type, in order to stimulate the desired changes in scalp condition to, for example, conditions preset by the user or recommended by a hair care professional.

[0074] The present invention also relates to a computer program product comprising instructions for performing a method for determining a user's scalp type, the method comprising:

[0075] The value indicating the humidity level of the area of ​​the user's scalp is obtained as input;

[0076] The value indicating the sebum level in the region of the user's scalp is obtained as input;

[0077] The group comprising the obtained values ​​indicating the humidity level and the values ​​indicating the sebum level is compared with reference ranges for scalp hydration and sebum levels, the reference ranges forming at least five scalp groups, each scalp group being associated with a humidity level range and a sebum level range, and each scalp group also being associated with a corresponding category of skin and / or hair care composition and / or skin and / or hair care treatment compatible with the humidity level range and sebum level range;

[0078] Based on the comparison, the user's scalp type is identified in the at least five scalp groups; and

[0079] Output the identified scalp type.

[0080] In other words, the present invention relates to a non-transitory computer-readable storage medium having a computer program stored thereon, the computer program including instructions for performing the methods described above. Attached Figure Description

[0081] The present disclosure is described below in conjunction with the accompanying drawings, wherein the same numerals denote the same elements, and:

[0082] Figure 1 A simplified workflow of a possible method according to an exemplary embodiment is shown;

[0083] Figure 2This is a schematic diagram of a method for measuring physiological parameters of a user's scalp according to an embodiment;

[0084] Figure 3 It is a graph showing the distribution of points corresponding to humidity levels (horizontal axis) and sebum levels (vertical axis) measured on a group of users, showing that these points are divided into five scalp groups;

[0085] Figure 4a This is a schematic diagram of a method for acquiring images of a user's scalp for feature analysis.

[0086] Figure 4b This is an illustration of a user's scalp, showing the features that can be found in the image. Detailed Implementation

[0087] This invention provides a method for determining a user's scalp type using a minimum amount of parameters from the user's scalp and based on an objective assessment of the scalp condition.

[0088] like Figure 1 As shown, method 10 for determining a user's scalp type begins with step 11 by obtaining the hydration level 111 and sebum level 112 on a region of the user's scalp. There are no restrictions on the size or location of the user's scalp region; however, it is preferable to select a portion of the scalp where hair density does not prevent the measuring device from approaching the user's scalp.

[0089] Regardless of the units used to represent sebum and hydration levels, these can be advantageously converted into conductivity values ​​(e.g., per unit area of ​​scalp surface) corresponding to hydration level values ​​and percentage light transmittance values ​​corresponding to sebum level values. Light transmittance values ​​describe the percentage reduction in light that can pass through a standard strip of paper in contact with the user's scalp to absorb the sebum present thereon. Other units can be used to describe the range and characteristics of each scalp group.

[0090] In step 12, the values ​​of the two parameters describing scalp oiliness (by sebum level) and scalp moisture (by moisture level) are compared with reference ranges for these two parameters.

[0091] These reference ranges define at least five scalp groups 131-135, based on the types of treatments or products generally suitable or recommended for each scalp group 131-135 (particularly categories of skin and / or hair care compositions and / or skin and / or hair care treatments 141-145). The applicant notes that sebum and moisture are two particularly suitable parameters for assessing scalp type. This observation stems from a comprehensive study of over one hundred representative users of different ages and genders.

[0092] On this representative group of users, usage typically includes, for example, Figure 2 The electrode measuring device shown is used to measure the hydration level of the scalp. This device 201 includes at least two electrodes 211, 212 and a controller 210 for measuring the current passing through the electrodes and the area of ​​the scalp 21 of the user 20. This device can obtain the hydration level of the scalp stratum corneum and output a Siemens value (in S or μS) representing the scalp conductivity per unit area of ​​scalp.

[0093] As in Figure 2 As further observed, sebum levels can be measured by applying a standard strip of paper 221 to an area of ​​the user's scalp 21. By absorbing the sebum present on the scalp, the paper strip 221 will show a change in its translucency. 0% indicates no change in translucency (indicating the lowest possible sebum concentration on the user's scalp such that the translucency of the standard strip does not change at all relative to a strip not in contact with the scalp), while 100% indicates a complete reduction in translucency compared to a strip with no sebum (indicating the highest measurable sebum level on the user's scalp).

[0094] Other standards can be used to define and measure scalp moisture levels and scalp sebum levels.

[0095] Additional instruments can be used to measure transepidermal moisture loss and scalp pH to obtain a more comprehensive picture of the scalp condition of 20 users from a representative group of users.

[0096] When these parameters were measured for all 20 users in this representative batch, the values ​​of sebum level versus humidity level were plotted as a two-dimensional graph, as shown below. Figure 3 As shown.

[0097] Figure 3 The vertical axis 302 displays sebum level values ​​in arbitrary units (corresponding to the translucency measured using standard paper strips as described above). These units can be converted to any other units depending on the type of method used to determine the sebum level.

[0098] Figure 3 The horizontal axis above shows the hydration level, expressed as stratum corneum conductivity measured in microsiemens (μS). These units can be converted to any other units depending on the type of method used to determine the hydration level.

[0099] If available Figure 3 As seen in the graph, the distribution of data points is uneven across all two-dimensional regions. Most users have low to medium sebum and hydration levels on their scalps, which is generally considered a "normal" scalp condition, or a scalp condition that naturally occurs shortly after washing a person's hair.

[0100] Figure 3Each individual scalp condition shown was also individually assessed by a hair care professional to determine the most suitable range of products for hair or scalp treatment. From this assessment and the use of clustering algorithms, it has been found that scalp types can be categorized... Figure 3 The at least five groups shown.

[0101] The first scalp group 1 typically corresponds to the hydration level of the upper skin conductivity, measurable from 0 μS to 40 μS, and the sebum level, measurable from 0 to 20%, of the sebum-absorbing band membrane in contact with the user's scalp with reduced translucency. Figure 3 This group comprises approximately 47% of all user scalp types. This group typically corresponds to scalps that are neither very wet nor very oily.

[0102] The second scalp group 2 typically corresponds to the hydration level of the upper skin conductivity, measurable from 0 μS to 80 μS, and the sebum level, measurable from 20% to 60% of the sebum absorption band membrane in contact with the user's scalp, indicating reduced translucency. Figure 3 It was noted that some points from Scalp Group 2 appear to partially overlap with points typically categorized by hair care professionals as suitable for other categories of scalp or hair care products and / or scalp and / or hair care treatments (i.e., those points from Scalp Group 4). This is not a concern, as the boundaries between adjacent scalp group types do not necessarily lead to incompatible recommendations. Scalps in Scalp Group 2 generally correspond to scalps that are not very wet and are slightly oily. Approximately 15% of all scalps observed in this representative batch fall into this scalp group. A frequent evolution that can be observed, for example, is the trend of moving from Scalp Group 1 to Scalp Group 2 when a user does not wash their hair for a period of time. Therefore, based on how often a person washes their hair, different types of hair or scalp products may be suitable to ensure a healthy scalp. It should also be noted that healthy scalps typically have moisture and oiliness values ​​that match those observed for Scalp Group 1.

[0103] The third scalp group (3) typically corresponds to the hydration level of the upper skin conductivity, measurable from 0 μS to 80 μS, and the sebum level, measurable from 60 to 100%, with reduced translucency of the sebum-absorbing band membrane in contact with the user's scalp. For example... Figure 3As shown, the actual boundary of the measured hydration level can extend to conductivity above 80 μS, although this extreme case occurs very rarely. The scalp of Group 3 typically corresponds to the oiliest scalp observed and includes approximately 8% of all scalps observed in the applicant's experiments. This is considered unattractive to the naked eye and is therefore associated with hair or scalp care products that significantly reduce scalp oiliness. Such products are generally considered too harsh and may slightly damage hair in other scalp types, but do not affect the scalp or hair of users from Group 3.

[0104] The fourth scalp group 4 typically corresponds to the hydration level of the upper skin conductivity, measurable in the range of 40 μS to 80 μS, and the sebum level, measurable in the range of 0 to 40%, with reduced translucency of the sebum-absorbing band membrane in contact with the user's scalp. Figure 3 Some points in the graph belong to both Type 2 (Scalp Group 2) and Type 4 (Scalp Group 4), particularly for sebum levels of 20-40% and hydration levels expressed as conductivity of 40-80 μS. As mentioned above, this has no significant impact on product recommendations, as at these intermediate values, the general recommendation is to cleanse the hair to reduce oiliness in scalp and / or hair care treatments or products. Since hydration is not aesthetically considered an indication of unhealthy or dirty hair or scalp, no further action on hydration is necessary. Approximately 22% of all users have a scalp type belonging to Type 4 (Scalp Group 4).

[0105] at last, Figure 3 The fifth scalp group 5 is shown, which generally corresponds to a hydration level with measurable upper skin conductivity of 80 μS or higher and a sebum level with reduced translucency of the sebum-absorbing band membrane in contact with the user's scalp, measurable from 0% to 60%. This group comprises approximately 8% of all scalp groups observed in the applicant's experiments.

[0106] In summary, users whose scalp type is identified as belonging to Scalp Group 3 will want to reduce the oiliness of their hair. This oiliness may simply be a temporary result of not washing their hair for an extended period or a temporary change in diet. Users whose scalp type is identified as belonging to Scalp Group 5 may want to reduce the moisture level of their scalp. Sweating scalps are generally considered more likely to attract residue from combing or contamination particles. Products with a higher surfactant content are generally considered best suited for this scalp type (e.g., 10% to 18% surfactant).

[0107] Another aspect of the invention relates to the time-related monitoring of the evolution of a user's scalp type. Users whose scalp type is identified most of the time as belonging to one of the first scalp group 1, the second scalp group 2, or the fourth scalp group 4 will unexpectedly notice changes in their scalp group when they switch to the third or fifth scalp group. This can trigger further insights that unusual changes in diet, daily routines, or specific health conditions are affecting the user's scalp. In addition to the application of hair or scalp treatments or specific hair or scalp care products, one suggestion may be to seek professional advice or receive specific recommendations regarding diet or routine health activities that may affect scalp moisture or oiliness.

[0108] Therefore, by comparing a set of values ​​including the hydration level and sebum level of the scalp area 21 of user 20 with, for example... Figure 3 By comparing the reference ranges shown in the diagram, the user's scalp type can be easily determined.

[0109] It should be noted that, in addition to measuring these two biophysical parameters to determine the user's scalp type, the image content of the user's scalp can also be analyzed.

[0110] Figure 4a This is a schematic diagram of an image acquisition device 401 that captures light reflected from a region of the scalp 21 of user 20. Although not shown, the acquisition device 401 typically includes a light-emitting unit capable of projecting ultraviolet light (wavelengths in the range of 100 nm to 400 nm) or polarized light (especially linearly polarized light) onto the region of the scalp 21 of user 20. A visible light source (wavelengths typically in the range of 400 nm to 800 nm) may also be present. The image acquisition device 401 also includes a corresponding sensor unit. The image acquisition device 401 also advantageously captures magnified images of the region of the scalp 21 of user 20, for example, at a magnification of approximately 80.

[0111] exist Figure 4b The image shown is an example of a magnified image 430 of a region of user 20's scalp 21. The magnified image 430 includes hair 431, red areas 432, and signs of dandruff 433.

[0112] Typically, image analysis involves examining the intensity of visible light reflected from the scalp in an image to determine the scalp's moisture level. The flaky appearance of hair in the presence of dandruff 433 is usually an indication of low scalp moisture. Based on the number of dandruff 433 fragments (their size and quantity in the magnified image 430), the moisture level can be qualitatively classified as high, mild, or low.

[0113] Polarized images highlight micro-inflammation or areas of higher sensitivity on the scalp. Erythema, often seen as the appearance of capillaries in the reddish portion 432, is a sign of higher sensitivity. Based on the amount of these areas (their corresponding size on the entire magnified image 430), a qualitative score can be given to the scalp, such as high, mild, or low.

[0114] Hair follicle blockage can be detected under ultraviolet (UV) light. Orange or red fluorescent areas near the hair roots can be seen in a magnified image (not shown). This fluorescence is typically due to porphyrin fluorescence under UV light. Porphyrins are produced by lipid-fed bacteria called *Propionibacterium acnes*, thus providing insight into the sebum levels of the scalp. Hair follicle blockage (and sebum levels) can be qualitatively graded from the magnified image 430 as high, mild, or low.

[0115] Table 1 below summarizes the characteristics typically found in each scalp group defined above, using the biophysical parameters or image analysis described above.

[0116] Table 1: Correspondence between reference ranges for biophysical measurements of moisture and sebum levels in all five scalp groups and feature counts on images.

[0117]

[0118] A method for determining a user’s scalp type has now been described, and another method for recommending skin or hair care products and / or skin or hair care treatments to the user based on the determined scalp type will be described.

[0119] As explained above. Each scalp group is defined based on a category of skin and / or hair care compositions and / or skin and / or hair care treatments that are compatible with the range of moisture and sebum levels observed in each scalp group.

[0120] Typically, users with scalp types belonging to Scalp Group 1 seek to increase scalp hydration to avoid abnormal dandruff and reduce scalp sensitivity.

[0121] Therefore, the surfactants in shampoo formulations for this scalp type should be mild to avoid irritating the scalp barrier. The total surfactant content should not exceed a certain threshold to avoid further excessive reduction of sebum from the scalp. Anti-dandruff agents can be used to solidify flakes and maintain a healthy scalp environment. Therefore, typical ranges include 10% to 18% surfactant, 0% to 2% total anti-dandruff agent, and a zein value below 0.75. The zein value defines the number of grams of zein that can be dissolved per gram of surfactant. Zein is a corn protein considered similar to keratin present in skin and hair. The zein value is an indicator of the irritant potential of a surfactant or surfactant-based product.

[0122] Typically, users with scalp type 2 (Group 2) seek to improve the water-oil imbalance on their scalp by increasing humidity levels and / or reducing sebum levels, thereby reducing scalp redness and sensitivity.

[0123] To achieve this, the surfactants in shampoo formulations for this scalp type should strike a balance between gentleness on the scalp and sufficient cleansing efficiency of the shampoo. Anti-dandruff agents can be used to solidify flakes and maintain a healthy scalp environment. Therefore, typical ranges include 12% to 20% surfactant, 0% to 2% total anti-dandruff agent, and a zein value below 1.

[0124] Typically, for users with scalp type 3 (scalp group 3), the goal is to reduce the sebum concentration on the scalp. Therefore, it is recommended to use more surfactants for thorough cleaning to avoid severe follicle blockage, unhealthy follicle irritation, and oily, sticky hair.

[0125] Therefore, the total surfactant content is sufficiently high. Some anti-dandruff agents may also be present, as long as they do not reduce the cleaning efficiency imparted by the surfactants. Thus, typical ranges include 14% to 20% surfactant, 0% to 1% total anti-dandruff agent, and a zein value below 2.5.

[0126] It is generally recommended to reassess a user's scalp type within 24 hours after washing their hair to avoid any significant impact of dirt buildup on the hair and scalp on the assessment of the user's scalp type.

[0127] Typically, for users whose scalp type belongs to the fourth scalp group (4), there is no need to seek special effects other than keeping the values ​​within the range of this scalp group. Scalps in this scalp group are usually highly resilient to external influences (such as hair chemical treatments, hair dyeing, and weather conditions).

[0128] Therefore, there are no particular restrictions on the type of surfactants used or their total content, and anti-dandruff agents are generally not required. Typical ranges include 10% to 18% surfactant and a zein value below 2.

[0129] Typically, users with scalp types belonging to Scalp Group 5 seek to achieve better scalp cleaning to remove any contaminant particles or residue that accumulate on a sweaty scalp during combing, and to prevent the proliferation of microorganisms on the scalp that can cause irritation that makes the scalp more sensitive.

[0130] To achieve this, some surfactants should be present to ensure proper scalp cleansing, but they should be moderately mild. Anti-dandruff agents are optional. Therefore, typical ranges include 10% to 18% surfactant and a zein value below 1.5.

[0131] By adding information from feature analysis on magnified images of the user's scalp, product or treatment recommendations in the aforementioned categories can be further enhanced.

[0132] In fact, a comprehensive count of these features can allow for more fine-tuning of each of the above recommendations to provide a more personalized scalp and hair care assessment for the user.

[0133] For example, in cases of high sensitivity manifested as numerous red areas on the scalp, it is recommended to focus more attention on the gentleness of the surfactants used in the shampoo.

[0134] The concentration of anti-dandruff agent in the final shampoo formulation can be increased or decreased based on the amount of dandruff seen in a magnified image.

[0135] For follicular blockage (considered as a higher or lower presence of fluorescent traces on an image under UV light, reflecting higher or lower sebum concentration), these not only represent sebum concentration but also indicate the interaction between the hair and scalp at the hair root. In cases of significant follicular blockage, increasing the frequency of shampooing and adjusting the surfactant concentration (by increasing its concentration for higher levels of follicular blockage) would reduce the amount of blockage and better protect the hair.

[0136] The surfactants used in shampoos can typically be selected from anionic surfactants, nonionic surfactants, and amphoteric surfactants.

[0137] Anionic surfactants may typically include at least one of the following: acylated amino acids, such as sodium lauroyl sarcosinate or TEA cocoyl glutamate; carboxylic acids and salts, such as sodium laureth-13 carboxylate; sulfonic acid derivatives, such as sodium methyl cocoyl taurate, sodium cocoyl hydroxyethyl sulfonate, or sodium C14-16 olefin sulfonate; and sulfuric acid derivatives, such as sodium laureth sulfate or ammonium lauryl sulfate.

[0138] Nonionic surfactants typically include at least one of the following: alkyl glucosides, such as coco glucoside or lauryl glucoside; amine oxides, such as laurylamine oxide.

[0139] Amphoteric surfactants typically include at least one of the following: alkylamide alkylamines, such as sodium lauroamphoacetate; alkyl betaines, such as cocamidopropyl betaine or coco-betaine, coco-hydroxysulfonate.

[0140] Typical anti-dandruff (AD) agents that can be found in shampoos include one of the following: zinc pyrithione, piroctone ethanolamine, ketoconazole, clomibazole, hexamidinediisethionate, or celery seed extract.

[0141] Table 2 below summarizes the different recommendations mentioned above.

[0142] Table 2: The types of typical shampoo compositions suitable for each scalp group are also based on features extracted from image analysis of the scalp.

[0143]

Claims

1. A method (10) for determining the scalp type of a user (20), the method comprising: Obtain the value of the humidity level (111) of the area of ​​the user's scalp (21); Obtain a value (112) indicating the sebum level in the region of the user's scalp; The group comprising the obtained values ​​indicating the humidity level and the sebum level is compared with reference ranges for scalp hydration and sebum levels, the reference ranges forming at least five scalp groups, each scalp group being associated with a humidity level range and a sebum level range, and each scalp group also being associated with a corresponding category of skin care composition and / or hair care composition and / or skin care treatment and / or hair care treatment, the corresponding category of skin care composition and / or hair care composition and / or skin care treatment and / or hair care treatment being compatible with the humidity level range and sebum level range; Based on the comparison, the user's scalp type is identified in the at least five scalp groups; and Output the identified scalp type. The at least five scalp groups mentioned above include: The first scalp group corresponds to the hydration level of the upper skin conductivity, which can be measured in the range of 0 μS to 40 μS, and the sebum level, which can be measured in the range of 0 to 20%, is a decrease in the translucency of the sebum-absorbing band membrane in contact with the user's scalp. The second scalp group corresponds to the hydration level of the upper skin conductivity, which can be measured in the range of 0 μS to 80 μS, and the sebum level, which can be measured in the range of 20 to 60%, with reduced translucency of the sebum-absorbing band membrane in contact with the user's scalp. The third scalp group corresponds to the hydration level of the upper skin conductivity, which can be measured in the range of 0 μS to 80 μS, and the sebum level, which can be measured in the range of 60 to 100%, with reduced translucency of the sebum-absorbing band membrane in contact with the user's scalp. The fourth scalp group corresponds to the hydration level of the upper skin conductivity, which can be measured in 40 μS to 80 μS, and the sebum level, which can be measured in 0 to 40% of the sebum absorption band membrane in contact with the user's scalp, with reduced translucency. The fifth scalp group corresponds to the hydration level of the upper skin with a measurable conductivity of 80 μS or higher and the sebum level with a measurable sebum-absorbing band membrane in contact with the user's scalp with reduced translucency, ranging from 0 to 60%.

2. The method of claim 1, wherein the at least five scalp groups are established based on data extracted from the scalps of at least one hundred users using at least one of the following: The measurement of biophysical parameters of the scalp, including the hydration level and sebum level of each scalp; Analysis of scalp features on magnified photographs (430) of the scalps of at least one hundred users.

3. The method of claim 1 or 2, wherein at least one of the following is used to obtain a value indicating the humidity level of the area of ​​the user's scalp and a value indicating the sebum level of the area of ​​the user's scalp: The measurement of biophysical parameter values ​​of the user's scalp in the aforementioned region, the biophysical parameter values ​​including the hydration level and sebum level of the user's scalp in the aforementioned region; Analysis of scalp features from magnified photographs of the area of ​​the user's scalp.

4. The method of claim 2, wherein the measurement of the biophysical parameters of the scalp includes conductivity or resistance measurement on the upper layer of the scalp to obtain hydration level values ​​and measurement of the translucency change of the sebum-absorbing band membrane in contact with the scalp to obtain sebum levels.

5. The method of claim 2, wherein the feature on the enlarged photograph includes at least one of the following: The intensity of light reflected from the area of ​​the scalp; The count of dandruff (433) on the magnified photograph; The count of the red portions (432) in the magnified photograph, the red portions indicating inflammation on the scalp; and The amount of fluorescence emitted from the hair follicles of the scalp, Each scalp was photographed under natural light, ultraviolet light, and polarized light conditions.

6. The method of claim 2, further comprising: The at least five scalp groups are defined based on visual assessments of the dryness and oiliness of the scalps of the at least one hundred users. For each of the at least five scalp groups, the visual assessment corresponds to an assessment of the similarity of the skin and / or hair care compositions and / or skin and / or hair care treatments suitable for the scalp group.

7. The method of claim 1 or 2, wherein the reference range is established based on data extracted from the scalps of at least one hundred users, and for each of the at least one hundred users, the method further comprises: Obtain magnified photos of the scalps of at least one hundred users; The obtained magnified photographs are grouped according to the defined at least five scalp groups; For each of the at least five scalp groups, determine the combination of features found in the grouped magnified photographs of the scalp belonging to that scalp group.

8. The method according to claim 1, wherein: The first scalp group is associated with a skin and / or hair care composition of the corresponding category comprising 10 to 18% surfactant and having a zein value of less than 0.75; The second scalp group is associated with a skin and / or hair care composition of the corresponding category comprising 12 to 20% surfactant and having a zein value of less than 1; The third scalp group is associated with skin and / or hair care compositions of the corresponding category that include 14 to 20% surfactant and have a zein value of less than 2.5; The fourth scalp group is associated with skin and / or hair care compositions of the corresponding category comprising 10 to 18% surfactants and having a zein value of less than 2; and The fifth scalp group is associated with skin and / or hair care compositions of the corresponding category that include 10 to 18% surfactant and have a zein value of less than 1.

5.

9. The method according to claim 1, wherein: The first scalp group is associated with a corresponding category of skin and / or hair care compositions comprising 0 to 2% anti-dandruff agent; The second scalp group is associated with a corresponding category of skin and / or hair care compositions comprising 0 to 2% anti-dandruff agent; The third scalp group is associated with skin and / or hair care compositions of the corresponding category, comprising 0 to 1% anti-dandruff agent; The fourth scalp group is associated with a corresponding category of skin and / or hair care compositions that do not contain anti-dandruff agents; and The fifth scalp group is associated with corresponding categories of skin and / or hair care compositions that do not contain anti-dandruff agents.

10. A method for recommending skin care compositions and / or hair care compositions and / or skin care treatments and / or hair care treatments to a user, comprising: The user's scalp type is determined using the method according to any one of claims 1 to 9; The corresponding category of skin care composition and / or hair care composition and / or skin care treatment and / or hair care treatment is determined based on the user's identified scalp type, and the corresponding category of skin care composition and / or hair care composition and / or skin care treatment and / or hair care treatment is compatible with the moisture level range and sebum level range of the user's scalp type; and Output the corresponding category of skin and / or hair care composition and / or skin and / or hair care treatment.

11. The method of claim 10, further comprising: Obtain a magnified photograph of the area of ​​the user's scalp; When the number of red portions above a predetermined threshold is identified in the magnified photograph, a skin and / or hair care composition containing a reduced proportion of surfactants suitable for sensitive scalps is recommended.

12. The method according to claim 10 or 11, further comprising: The current value of the humidity level of the area of ​​the user's scalp and the current value of the sebum level of the area of ​​the user's scalp are compared with previously obtained values ​​for the area of ​​the user's scalp. When it is determined that the sebum level in the area of ​​the user's scalp is increased, a recommendation is output to increase the frequency of shampooing using a hair care composition compatible with the user's scalp type; When it is determined that the sebum level in the area of ​​the user's scalp is reduced, a recommendation is made to use a hair care composition or skin care composition comprising a lower proportion of surfactants.

13. A computer program product comprising instructions for performing a method for determining a user's scalp type, the method comprising: The value indicating the humidity level of the area of ​​the user's scalp is obtained as input; The value indicating the sebum level in the region of the user's scalp is obtained as input; The group comprising the obtained values ​​indicating the humidity level and the sebum level is compared with reference ranges for scalp hydration and sebum levels, the reference ranges forming at least five scalp groups, each scalp group being associated with a humidity level range and a sebum level range, and each scalp group also being associated with a corresponding category of skin care composition and / or hair care composition and / or skin care treatment and / or hair care treatment, the corresponding category of skin care composition and / or hair care composition and / or skin care treatment and / or hair care treatment being compatible with the humidity level range and sebum level range; Based on the comparison, the user's scalp type is identified in the at least five scalp groups; and Output the identified scalp type. The at least five scalp groups mentioned above include: The first scalp group corresponds to the hydration level of the upper skin conductivity, which can be measured in the range of 0 μS to 40 μS, and the sebum level, which can be measured in the range of 0 to 20%, is a decrease in the translucency of the sebum-absorbing band membrane in contact with the user's scalp. The second scalp group corresponds to the hydration level of the upper skin conductivity, which can be measured in the range of 0 μS to 80 μS, and the sebum level, which can be measured in the range of 20 to 60%, with reduced translucency of the sebum-absorbing band membrane in contact with the user's scalp. The third scalp group corresponds to the hydration level of the upper skin conductivity, which can be measured in the range of 0 μS to 80 μS, and the sebum level, which can be measured in the range of 60 to 100%, with reduced translucency of the sebum-absorbing band membrane in contact with the user's scalp. The fourth scalp group corresponds to the hydration level of the upper skin conductivity, which can be measured in 40 μS to 80 μS, and the sebum level, which can be measured in 0 to 40% of the sebum absorption band membrane in contact with the user's scalp, with reduced translucency. The fifth scalp group corresponds to the hydration level of the upper skin with a measurable conductivity of 80 μS or higher and the sebum level with a measurable sebum-absorbing band membrane in contact with the user's scalp with reduced translucency, ranging from 0 to 60%.

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