JP6985826B2 - Application condition evaluation method - Google Patents

Description

The present invention relates to a coating state evaluation method for evaluating the coating state of an agent and a coating state evaluation device used in this coating state evaluation method.

At present, it is required at the site of drug development to evaluate the state in which an agent such as cosmetics is applied to the skin. Known methods for evaluating such agents are described in, for example, Patent Documents 1 to 3. In the cosmetic evaluation method described in Patent Document 1, an agent (cosmetic) is applied to the replica surface of the skin, the surface of the replica to which the agent is applied is imaged, and the luminance value is extracted from the captured image. Then, the brightness value is associated with the result of the sensory test such as powderiness and easiness of unevenness. Further, Patent Document 2 describes that an agent is applied to a replica, and the surface roughness of the coating film is associated with the results of gloss measurement and sensory test by a gloss measuring device. Further, Patent Document 3 describes that an agent is applied to the skin of a subject, and an image is taken to measure the luminance value. In the invention described in Patent Document 3, a histogram of the measured luminance value is created, and the change with time of the skin condition is observed from the distortion of the histogram.

Japanese Unexamined Patent Publication No. 2006-290745 Japanese Unexamined Patent Publication No. 2000-0632339 Japanese Unexamined Patent Publication No. 2009-134372

However, in both the inventions described in Patent Document 1 and Patent Document 2, the agent is applied to the surface of the replica to evaluate the agent. Such an evaluation evaluates the characteristics of the agent such as powderiness and easiness of unevenness. The skin color of the subjects varies widely, and the method of applying the agent also differs depending on the subject. Therefore, further improvement has been required for evaluating the "appearance" of the skin of the subject to which the agent has been applied.
Further, Patent Document 3 describes that the degree of makeup loss is determined from the change in the degree of distortion of the histogram. However, the invention described in Patent Document 3 detects a change in the spread of the agent immediately after makeup and after a lapse of time.
The present invention has been made in view of the above points, and relates to an application state evaluation method and an application state evaluation system capable of evaluating the influence of the state of an agent applied to the skin on the appearance of the skin.

One aspect of the coating state evaluation method of the present invention relates to a coating state evaluation method for evaluating the coating state of the agent, and includes first information relating to light reflection in the first state of the surface to be coated to which the agent is applied. A step of generating reflected light ratio information indicating a ratio with the second information relating to light reflection in the second state, which is a state different from the first state of the surface to be coated, and a step of generating the reflected light ratio information of the surface to be coated in the second state. Includes a step of generating luminance information relating to the luminance of the captured image.

It is possible to provide an application state evaluation method and an application state evaluation system capable of evaluating the influence of the state of the agent applied to the skin on the appearance of the skin.

It is a flowchart which showed each process of the evaluation method of the coating state of one Embodiment of this invention. It is a figure for demonstrating the reflectance measurement process shown in step S101 of FIG. It is a figure which showed the curve of the reflected light ratio information which shows the ratio between the reflectance curve of bare skin shown in FIG. 2 and the reflectance curve of powder foundation. It is a figure for demonstrating the classification process of one Embodiment of this invention. It is a flowchart for demonstrating the process of plotting n data of one Embodiment of this invention. It is a figure which showed the result of the observation of the small area shown in FIG. 2 in association with the luminance value and the reflected light ratio. It is a figure which shows the appearance of the coating state evaluation system of one Embodiment of this invention. It is a block diagram for demonstrating the evaluation control part inside the PC shown in FIG. 7.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In all drawings, similar components are designated by the same reference numerals, and duplicate description will be omitted as appropriate.
[Applying condition evaluation method]
The coating state evaluation method of the present embodiment is a coating state evaluation method for evaluating the coating state of the agent, and is the first information relating to the light reflection of the first state of the surface to be coated to which the agent is applied, and the coated state. The process of generating reflected light ratio information indicating the ratio with the second information related to the light reflection in the second state, which is different from the first state of the surface, and the brightness of the captured image of the surface to be coated in the second state. It includes a step of generating luminance information.
Here, the "agent" may be anything as long as it is applied to human skin and remains on the skin and affects the appearance of the skin. Examples of such agents include solid and liquid foundation creams and sunscreens (sunscreens). The "applied state of the agent" refers to, for example, the dispersed state of the agent on the skin and the applied thickness.
Further, in the present embodiment, the surface to be coated in the first state and the surface to be coated in the second state are the same surface. Therefore, when the surface in the first state is a part of the entire surface, in the step of generating the reflected light information, when the same part as the part in the first state of the entire surface is in the second state. The second information of is compared with the first information, and the ratio is calculated.

However, the present embodiment is not limited to such a configuration. For example, the agent in the present embodiment is not limited to the one applied to the entire face such as foundation, and may be a cosmetic agent used for point makeup such as cheek, eye shadow and concealer. Further, it may be an agent used together with a foundation such as a makeup base.
Further, the application state of the agent may be any state as long as the state can be directly or indirectly observed by the configuration including an imaging device such as a camera. Further, "observable" is not limited by the performance such as the current resolution of the imaging device, and may be theoretically observable.

FIG. 1 is a flowchart showing each step of the above-mentioned coating state evaluation method. As shown in FIG. 1, the coating state evaluation method of the present embodiment includes a reflectance measurement step (S101), a reflected light ratio information generation step (S102), an image information creation step (S103), and a luminance information generation step (S104). Includes. Hereinafter, each of the above steps shown in FIG. 1 will be described in order.
(Reflectance measurement process)
2 (a), 2 (b) and 2 (c) are diagrams for explaining the reflectance measurement step shown in step S101 of FIG. FIG. 2A is a diagram showing a small area A which is a surface to be coated to which the agent is applied. The small area A is preferably a part of the subject's face on which the reflected light is measured and has few wrinkles and spots that may disturb the observation of the application state of the agent.

2 (b) and 2 (c) both show the first information related to the light reflection in the first state of the present embodiment and the second information related to the light reflection in the second state of the small region A. It is a figure. However, FIGS. 2 (b) and 2 (c) are for different subjects. The vertical axis of FIGS. 2B and 2C is information related to light reflection, and is the reflectance of light in the present embodiment. The horizontal axis is the wavelength of light, the reflectance on the vertical axis is the spectral reflectance, and the reflectance for each wavelength component of light. In FIGS. 2 (a) and 2 (b), the wavelength on the horizontal axis is divided into a short wavelength region in the range of about 430 nm or more and less than 510 nm and a medium-long wave region in the range of about 510 nm or more and 710 or less. In the present embodiment, the first information and the second information are defined as the reflectance of light having a wavelength in the medium-long wave region in a predetermined range of 510 nm or more and 710 or less.

Further, the first information and the second information do not limit the information related to the reflected light to the reflectance as described above, and may be, for example, the intensity of the reflected light itself. Further, the first information and the second information may use any of surface reflection, internal reflection and total light reflection.
Further, the present embodiment is not limited to scanning all continuous wavelengths in a predetermined range with respect to the measurement of reflectance, and may discontinuously measure reflected light having a plurality of wavelengths.

The first state of the present embodiment means a state in which the agent is not applied. The first information is information related to light reflection when the small region A is bare skin, and is shown by a broken line in FIGS. 2 (b) and 2 (c). Further, the second state of the present embodiment is a state different from the first state of the same small area A as the small area A from which the first information is acquired. The different state means, for example, that the first state is bare skin, while the second state is a state in which the agent is applied. In such an example, the second information is information related to light reflection when the powder foundation (PFD) is applied to the small area A, and is shown by a solid line in FIGS. 2 (b) and 2 (c). It is shown.
The first state of the present embodiment is not limited to the state in which the agent is not applied. For example, the first state may be the state immediately after the agent is applied, and the second state may be the state in which the agent has been applied for a long time. By doing so, it is possible to evaluate the change in the state of the agent applied to the skin with time.
Further, the first state of the present embodiment is a state in which the powder foundation is applied, and the second state may be a state in which a point make such as cheek is applied on the powder foundation applied in the first state. ..

The powder foundation is a solid foundation containing powder, and contains a pigment, an ultraviolet scattering agent, a thickener, an emollient agent, a base component, a moisturizer, a rough skin preventive agent, an essential oil and the like. Examples of the powder include hydroxyapatite, acrylates cross polymer, silica and (vinyl dimethicone / methicone silsesquioxane) cross polymer. Examples of the pigment include talc, mica, titanium oxide, synthetic phlogopite, zinc oxide and oxidation (Li / K / titanium), and among them, titanium oxide and synthetic phlogopite also function as an ultraviolet scattering agent. Further, as the thickener, for example, polymethyl methacrylate can be used. Examples of the emollient agent include dimethicone, triethylhexanoin, hydrogen dimethicone, trimethylsiloxysilicic acid, diphenylsiloxyphenyltrimethicone, tocopherol and jojoba ester. Examples of the base component include isostearyl sebacate, Al hydroxide, (dimethicone / vinyldimethicone) crosspolymer, polymethylsilsesquioxane, triethoxycaprylylsilane, fluoro (C9-15) alcoholic acid and dimyristic acid. There are Al and the like. Examples of the moisturizer and the rough skin preventive agent include panthenol, hydroxyproline, polyquaternium-61, sodium hyaluronate and the like. Examples of the essential oil include bisabolol and the like.

In the curve of FIG. 2B (hereinafter referred to as “reflectance curve”) showing the reflectance measured in the small area A of the subject (hereinafter referred to as “subject α”), the small area A is the state of bare skin. Even when the powder foundation is applied, it rises with a relatively gentle slope in the short wavelength region, the slope becomes gentle between 530 nm and 630 nm, and then it has a steep angle. Is rising. Therefore, the reflectance curve has a portion (curved portion) that slightly curves downward at a portion where the inclination changes. Such a characteristic of reflectance is also the same in the reflectance measured in the small region A of the subject (hereinafter referred to as “subject β”) shown in FIG. 2 (c).
However, the specific shape of the reflectance curve is such that the color of the small region A differs between the subject α and the subject β. This point is caused by the difference in the color of the small region A between the subject α and the subject β. That is, the skin color of Japanese is determined by melanin, oxyhemoglobin, deoxyhemoglobin and the like. The reflectance curve in the short wavelength region shows the amount of bluish component of the skin, and the reflectance curve in the medium / long wavelength region shows the amount of reddish component of the skin.

Comparing the reflectance curve of FIG. 2 (b) and the reflectance curve of FIG. 2 (c), the reflectance curve shown in FIG. 2 (b) has the reflection shown in FIG. 2 (c) in the curved portion. It can be seen that there is less change in shape before and after applying the powder foundation than on the reflectance curve. This point indicates that subject α has less change in complexion impression due to application (makeup) of powder foundation than subject β. Such makeup is also called natural-finished makeup and is one of the criteria for preferable makeup. The preferred criteria for makeup are not limited to the natural finish. For example, the target reflectance may be a preferable standard, or makeup such as stage makeup in which facial features can be clearly seen from a relatively long distance may be a preferable standard.

(Reflected light ratio information generation process)
Next, the reflected light ratio information generation step shown in step S102 of FIG. 1 will be described.
FIG. 3A is a curve of reflected light ratio information (reflected light ratio information curve) showing the ratio between the reflectance curve of the bare skin of the subject α shown in FIG. 2A and the reflectance curve when the powder foundation is applied. It is a figure which showed. FIG. 3B is a diagram showing a reflected light ratio information curve between the reflectance curve of the bare skin of the subject β shown in FIG. 2B and the reflectance curve when the powder foundation is applied. In FIGS. 3A and 3B, the reflectance curve of the bare skin is shown by a broken line, and the reflectance curve of the powder foundation is shown by a solid line. At this time, in FIGS. 3A and 3B, the reflectance ratio was obtained as the reflectance of the small area A to which the powder foundation was applied / the reflectance of the small area A of the bare skin, so that the small area of the bare skin was obtained. The reflected light ratio of A (reflectance of bare skin / reflectance of bare skin) is always 1.0.
By doing so, in this embodiment, the influence of the difference in skin color between the subject α and the subject β can be excluded from the information on the reflectance, and the influence of the powder foundation application can be extracted.

(Image information creation process)
Next, the image information creating step shown in step S103 of FIG. 1 will be described. The image information is created by capturing the small area A and creating the captured image of the small area A. Imaging of the small area A is performed using a relatively high resolution camera. As such a camera, it is preferable to use a so-called hyperspectral camera as described later.

(Brightness information generation process)
Next, the luminance information generation step shown in step S104 of FIG. 1 will be described. The luminance information generation step is a step of generating luminance information related to the luminance of the captured image of the small area A in the state where the powder foundation is applied (second state). Here, the "small area A in the state where the powder foundation is applied" is the same as the small area A whose reflectance was measured after the powder foundation was applied in step S101 of FIG.
The luminance information is information indicating the degree of dispersion of the luminance of the captured image, and in this embodiment, the standard deviation of the luminance is used. In the present embodiment, the captured image of the small region A is binarized, or the “G” component of the captured image is extracted to obtain the standard deviation of the brightness. The magnitude of the standard deviation indicates the degree of dispersion of the brightness. The larger the standard deviation is, the more agglomerated the powder foundation is, and the smaller the standard deviation is, the more the powder foundation is uniformly applied.
In this embodiment, as described above, the reflectance is measured before and after the application of the powder foundation, and the skin of the subject is evaluated by taking the ratio of the reflectance. In addition, since the reflectance ratio is associated with the degree of dispersion of the powder foundation, the relationship between the change in the appearance of the skin due to the powder foundation and the state of the agent applied to the skin regardless of the skin color of the subject. Can be evaluated. It can be said that such an embodiment can evaluate the influence of the state of the agent applied to the skin on the appearance of the skin.

Further, in the present embodiment, in order to make it easier to intuitively understand the relationship between the reflected light ratio information and the luminance information obtained as described above, the state (second state) after the powder foundation is applied to the subject is set. It is preferable to include a step of classifying. Hereinafter, such a classification process will be described.
The classification step of the present embodiment divides the reflected light ratio information into a first reflected light ratio range and a second reflected light ratio range according to the value of the light reflectance ratio. Further, the standard deviation, which is the luminance information, is divided into a first dispersion range and a second dispersion range according to a value (degree of dispersion of luminance). Then, by combining the first reflectance range, the second reflectance range, the first dispersion range, and the second dispersion range, the state of the small region A, which is the surface to be coated, after the powder foundation is applied is set to any one of the plurality of groups. It is a process to classify into.
FIG. 4 is a diagram for explaining the classification process. The vertical axis of FIG. 4 shows the standard deviation of the brightness of the captured image in the small area A, and the horizontal axis shows the reflected light ratio before and after the application of the powder foundation in the small area A. That is, the value on the horizontal axis is the value on the vertical axis of the reflectance curve shown in FIG. 3, but the value on the horizontal axis in FIG. 4 is shown by subtracting "1" from the value on the vertical axis in FIG.
Further, in FIG. 4, an axis H showing a constant luminance value and an axis V showing a constant reflected light ratio are shown. The axis H and the axis V indicate the threshold values at which the luminance value and the reflected light ratio are determined to be “favorable”, respectively. Such a threshold value may be a value arbitrarily set by the evaluator, or may be obtained in advance by a sensory evaluation or the like by a professional evaluator. By being separated by the axis H and the axis V, the range of the ratio of the luminance value and the reflected light shown in FIG. 4 is divided into four quadrants I, the second quadrant II, the third quadrant III, and the fourth quadrant IV. Will be.

In the present embodiment, the reflected light ratio and the luminance value of the small area A are obtained for a plurality of subjects. Then, for each small area A, for example, the luminance value is plotted on the vertical axis and the reflected light ratio is plotted on the horizontal axis. By doing so, the plot will be marked in any of the first to fourth quadrants shown in FIG. A plurality of plots belonging to the same quadrant are referred to as "groups" in this embodiment.

FIG. 5 is a flowchart for explaining a process of plotting n data. As shown in FIG. 5, in the present embodiment, first, "1" is set for n (step S105). Then, the nth data is plotted in the graph shown in FIG. 4 (step S106). The "plot" referred to here may be displayed in the graph or may determine the coordinates of the plot. Next, n is counted up by one (step S107), and it is determined whether or not _{n after the count-up has reached the maximum number n max of data (step S108).} As a result of the determination, when n is the maximum number n _max or less (step S108: No), the nth data is plotted again (step S106). Further, when n is _{larger than the maximum number n max} (step S108: Yes), the processing is terminated assuming that the plot is completed for all the data.

According to FIG. 4, the plot d1 belongs to the group of the first quadrant, and the plots d3 and d4 belong to the group of the second quadrant. Further, the plot d5 belongs to the group of the third quadrant, and the plot d2 belongs to the group of the fourth quadrant. In the subjects who obtained the data of plot d1, the powder foundation was applied in a dispersed manner because the luminance value was low, and the change in skin color due to the application of the powder foundation was relatively small because the reflected light ratio was small. In this embodiment, such a subject is evaluated as having both a luminance value and a reflected light ratio being preferable.

In this embodiment, the small area A of the subject who obtained the plot d5 from the plot d1 shown in FIG. 4 was observed using a microscope, and the state was associated with the plot d1 to the plot d5. As a result of the observation, it was found that the powder foundation was applied thicker than the subject who obtained the plot d1 in the small area A of the subject having a large reflected light ratio. Further, it was found that in the small area A of the subject having a large luminance value, more aggregation of the powder foundation was observed than in the subject who obtained the plot d1.
FIG. 6 is a diagram showing the results of observation of the small area A in association with the luminance value and the reflected light ratio. As shown in the figure, the small area A of the subject who obtained the plot d1 belonging to the group of the first quadrant I is in a state where the powder foundation f is uniformly applied on the skin. Further, in the small area A of the subject who obtained the plots d3 and d4 belonging to the group of the second quadrant II, the powder foundation f was thicker than the state of the plot d1 and was applied unevenly on the skin hill. It has become. In the small area A of the subject who obtained the plot d5 belonging to the group of the third quadrant III, the powder foundation f is thickly applied on the skin hills, and in addition, it is aggregated and applied to the pores and the like. Further, in the small area A of the subject who obtained the plot d2 belonging to the group of the fourth quadrant IV, although the powder foundation f was thinly and uniformly applied, it was in a state of being aggregated in the pores and the like.

Moreover, in this embodiment, the following findings were obtained in comparison with the results of such observations.
(I) In many subjects, the skin color changes depending on the amount of powder foundation f applied.
(Ii) For subjects whose complexion changes even though the application thickness of the powder foundation f is relatively small and the complexion does not change even if the application amount is further increased, powder is applied to the pores even if the application amount of the powder foundation is small. Foundation agglomeration is occurring.
(Iii) When the amount of powder foundation f applied is small, the change in skin color is small, but when the amount of application is increased, the color of the skin changes significantly. It will be like.
(Iv) In the subject in which the change in skin color is small even when the application amount of the powder foundation f is increased, the powder foundation f is dispersed on the skin even when the application thickness of the powder foundation f is increased.

As described above, the present embodiment is limited to showing the state of the small area A by drawing a plot on a graph having a luminance value (standard deviation of luminance) and a reflected light ratio as two axes. is not it. For example, in the present embodiment, the difference between the state of the bare skin of the small area A and the state after applying the powder foundation may be indicated by a vector centered on the standard deviation of the reflected light ratio and the brightness.
Specifically, in the present embodiment, for example, the coordinates of the small region A in the bare skin (the reflected light ratio is 1) are set as the starting point on the vector space having the reflected light ratio and the standard deviation of the luminance as two axes. The state of the small area A can be represented by a vector whose end point is the coordinates of the small area A after the powder foundation is applied. According to such a vector, the angle indicates the coating thickness and the tendency of aggregation of the powder foundation, and the length (inner product) indicates the degree.

Further, in the present embodiment, the reflected light ratio (reflected light ratio information) and the standard deviation of the brightness (luminance information) after the powder foundation is applied to the surface to be coated are set to the reflected light ratio of the other small area A after the powder foundation is applied. And it is preferable to further include a step of selecting an agent corresponding to approaching the standard deviation of luminance.
In the above description, the "other subregion A" refers to the subregion A of another subject. That is, in the present embodiment, for example, the reflected light ratio and the standard deviation of the brightness of the plots classified into the group of the third quadrant III shown in FIG. 4 are the reflected light of the plots classified into the group of the first quadrant I. Suitable agents can be selected to bring the ratio and brightness closer to the standard deviation.

More specifically, consider, for example, a case where a subject corresponding to a plot classified into the group of the third quadrant III shown in FIG. 4 targets a plot classified into the group of the first quadrant I. When targeting the group of the first quadrant I from the group of the third quadrant III, the reflected light ratio of the small region A must be reduced to reduce the standard deviation of the brightness. For this reason, in the case of moving from the group of the third quadrant III to the group agent of the first quadrant I, a powder foundation that emphasizes both extensibility and covering power, or a makeup base used with the powder foundation, etc. are associated in advance. There is.
Further, consider the case where the subject corresponding to the plot classified into the group of the second quadrant II shown in FIG. 4 aims at the plot classified into the group of the first quadrant I. When targeting the group of the first quadrant I from the group of the second quadrant II, the reflected light ratio of the small region A must be reduced. For this reason, in the case of moving from the group of the second quadrant II to the group agent of the first quadrant I, a powder foundation that emphasizes extensibility rather than covering power is associated in advance.
Further, consider the case where the subject corresponding to the plot classified into the group of the fourth quadrant IV shown in FIG. 4 targets the plot classified into the group of the first quadrant I. When targeting the group of the first quadrant I from the group of the fourth quadrant IV, the standard deviation of the brightness of the small region A must be reduced. For this reason, in the case of moving from the 4th quadrant IV group to the 1st quadrant I group agent, a powder foundation that emphasizes coverage rather than extensibility, a makeup base that smoothes unevenness such as skin pores, etc. are provided in advance. It is associated.

According to the above step, the evaluator of the applied state can determine the group to which the plot of the subject belongs, select the powder foundation or the like associated in advance according to this group, and recommend it to the subject. Such a process can be realized, for example, by using a database or the like that records appropriate agents according to a group of current plots and a group of target plots.

(Applyment condition evaluation system)
Next, the coating state evaluation system used in the coating state evaluation method described above will be described. The processes shown in the flowcharts of FIGS. 1 and 5 are performed by the coating state evaluation system.
7 and 8 are diagrams for explaining the coating state evaluation system of the present embodiment. FIG. 7 is a diagram showing the appearance of the coating state evaluation system, and FIG. 8 describes a control unit 60 which is an internal evaluation control unit of the personal computer (Personal Computer, hereinafter “PC”) 3 shown in FIG. 7. It is a block diagram for doing.
In the coating state evaluation system of the present embodiment, the first information relating to the light reflection in the first state of the surface to be coated to which the agent is applied and the light in the second state different from the first state of the surface to be coated are present. The spectroscopic camera 1, which is a light reflection information acquisition unit that acquires the second information related to reflection, the luminance information acquisition unit that acquires the captured image of the surface to be coated in the second state, and the first information and the second information. A PC3 that functions as an evaluation control unit that evaluates the application state of the agent based on the ratio of the above and the luminance information related to the luminance of the captured image. The PC 3 includes a user interface 32, a display unit 31, and a control unit 60 shown in FIG.
Further, in the coating state evaluation system, the surface to be coated is the small area A shown in FIG. 2, the first state is the state of the bare skin, the second state is the state after applying the powder foundation, and the first information and the second information are reflected. Light and luminance information will be described as the standard deviation of luminance.

The spectroscopic camera 1 is a so-called hyperspectral sensor image spectroscopic camera. The spectroscopic camera 1 captures a small area A in a bare skin state and acquires reflected light. Then, the information of the captured image and the value of the reflected light are input to the input interface 61 of the PC 3 as the image information P. The control unit 60 includes a reflected light ratio information generation unit 63 and a luminance information generation unit 65. The reflected light ratio information generation unit 63 extracts the reflected light from the image information P, divides the reflectance of the small area A after applying the powder foundation by the reflectance of the small area A of the bare skin, and divides the ratio of the reflected light by the reflected light. Generated as ratio information. Further, the luminance information generation unit 65 generates the standard deviation of the luminance of the small region A after applying the powder foundation from the captured image of the image information P as the luminance information.
The reflected light ratio and the luminance information generated by the control unit 60 are graphed by a general-purpose program of the PC3, and the image information of the graph is expanded in a memory (not shown). The image information of the expanded graph is output to the display unit 31. The display unit 31 is a concept including a display screen and a driver for displaying an image on the display screen.

According to the present embodiment described above, the reflectance of light is measured on the bare skin and after the application of the agent, and the ratio of the reflectances is taken to evaluate the relationship with the degree of dispersion of luminance. Therefore, in the present embodiment, even if the agent is applied to the skin of the subject, it is possible to evaluate only the influence on the complexion and texture due to the application of the agent regardless of the complexion of the subject. Such an embodiment can provide an application state evaluation method and an application state evaluation system capable of evaluating the influence of the state of the agent applied to the skin on the appearance of the skin.
It should be noted that the embodiment of the present invention is not limited to evaluating the condition of the skin by comparing it before and after applying the agent. For example, in the present embodiment, the condition of the skin can be evaluated by comparing the condition immediately after the application of the agent and the condition after the time has passed after the application. According to such an evaluation, it becomes possible to evaluate the state of makeup loss by the present embodiment.

Further, the present embodiment is not limited to the configuration using the spectroscopic camera 1. For example, the present embodiment may separately include a camera that captures an image in the small region A and a measuring instrument that measures the reflected light. However, if the image of the small area A and the reflected light are measured at the same time using the spectroscopic camera 1 as in the present embodiment, the image and the reflected light can be accurately and reliably measured in the small area A, so that the reflected light can be measured. The ratio information and the brightness information can be accurately associated with each other.
Further, in the present embodiment, instead of the spectroscopic camera, a camera having no spectroscopic function may be provided with a filter corresponding to, for example, R, G, B colors to disperse the reflected light for each wavelength. By doing so, it is possible to construct the coating state evaluation system of the present embodiment using a camera that is cheaper than the spectroscopic camera.
Further, the present embodiment is not limited to measuring both the reflected light ratio information and the luminance information by the measuring instrument. For example, the ratio of the reflected light measured by using a measuring instrument may be used for the reflected light ratio information, and the result of sensory observation by a professional evaluator may be used for the degree of dispersion of the luminance as the pixel information.

The above embodiments and examples include the following technical ideas.
<1> A coating state evaluation method for evaluating a coating state of an agent, the first information relating to light reflection of the first state of the surface to be coated to which the agent is applied, and the first state of the surface to be coated. Is a step of generating reflected light ratio information indicating a ratio with the second information related to light reflection in the second state, which is a different state, and brightness information related to the brightness of the captured image of the surface to be coated in the second state. A coating state evaluation method comprising a step of producing.
<2> The coating state evaluation method according to <1>, wherein the first information and the second information are reflectances of light having a wavelength in a predetermined range.
<3> The coating state evaluation method of <1> or <2>, wherein the luminance information indicates the degree of dispersion of the luminance of the captured image.
<4> The reflected light ratio information is the ratio of the light reflectance in the first state of the surface to be coated and the light reflectance in the second state of the surface to be coated, and the brightness information is the brightness of the captured image. The degree of dispersion of the above is shown, the reflected light ratio information is divided into a first reflectance range and a second reflectance range according to the value of the ratio of the light reflectance, and the brightness information is divided into the degree of dispersion of the brightness. It is divided into a first dispersion range and a second dispersion range according to the above, and the combination of the first reflectance range, the second reflectance range, the first dispersion range and the second dispersion range causes the surface to be coated to be coated. The coating state evaluation method of <1> further comprising a classification step of classifying the second state into one of a plurality of groups.
<5> The difference between the second state of the surface to be coated and the second state of the other surface to be coated is shown by a vector centered on the reflected light ratio information and the luminance information, from <1> to <. 3> Any one of the application state evaluation methods.
<6> An agent corresponding to bringing the reflected light ratio information and the luminance information of the second state of the surface to be coated closer to the reflected light ratio information and the luminance information of another second state of the surface to be coated. A coating state evaluation method according to any one of <1> to <5>, which comprises a step of selecting.
<7> First information relating to light reflection in the first state of the surface to be coated to which the agent is applied, and second information relating to light reflection in a second state different from the first state of the surface to be coated. The light reflection information acquisition unit that acquires the light reflection information, the luminance information acquisition unit that acquires the captured image of the surface to be coated in the second state, the ratio of the first information and the second information, and the captured image. A coating state evaluation system comprising an evaluation control unit for evaluating a coating state of the agent based on brightness information related to the brightness.

1 ... Spectral camera 31 ... Display unit 32 ... User interface 60 ... Control unit 61 ... Input interface 63 ... Reflected light ratio information generation unit 65 ... Luminance information generation unit

Claims (6)

It is a coating state evaluation method for evaluating the coating state of an agent.
The first information relating to the light reflection of the first state of the surface to be coated to which the agent is applied and the second information relating to the light reflection of the second state which is a state different from the first state of the surface to be coated. The process of generating reflected light ratio information indicating the ratio, and
A step of generating luminance information related to the luminance of the captured image of the surface to be coated in the second state, and
Only including,
The first information and the second information are information relating to light reflection having a wavelength in the medium-long wave region of 530 nm or more and 630 nm or less, which is predetermined.
The wavelength is a wavelength at a portion where the curve of the spectral reflectance of the surface to be coated changes from a gentle slope to a steep slope and curves downward convexly . The coating state evaluation method according to claim 1, wherein the luminance information indicates the degree of dispersion of the luminance of the captured image. The reflected light ratio information is the ratio of the light reflectance in the first state of the surface to be coated and the light reflectance in the second state of the surface to be coated, and the brightness information is the dispersion of the brightness of the captured image. Show the degree,
The reflected light ratio information is divided into a first reflectance range and a second reflectance range according to the value of the light reflectance ratio, and the brightness information is divided into a first dispersion range according to the degree of dispersion of the brightness. And the second dispersion range, and the second state of the surface to be coated is divided into a plurality of groups by the combination of the first reflectance range, the second reflectance range, the first dispersion range and the second dispersion range. The coating state evaluation method according to claim 1, further comprising a classification step of classifying into any one of the above. The second state of the surface to be coated and the other second state of the surface to be coated are shown by a vector centered on the reflected light ratio information and the luminance information, according to claim 1 or 2 . Application condition evaluation method. A step of selecting an agent corresponding to bringing the reflected light ratio information and the luminance information of the second state of the surface to be coated closer to the reflected light ratio information and the luminance information of another second state of the surface to be coated. The coating state evaluation method according to any one of claims 1 to 4, which comprises. The first information relating to the light reflection in the first state of the surface to be coated and the second information relating to the light reflection in the second state different from the first state of the surface to be coated are provided. The light reflection information acquisition unit to be acquired and
A luminance information acquisition unit that acquires an image of the surface to be coated in the second state,
It is provided with an evaluation control unit that evaluates the application state of the agent based on the ratio of the first information and the second information and the luminance information related to the luminance of the captured image.
The first information and the second information are information relating to light reflection having a wavelength in the medium-long wave region of 530 nm or more and 630 nm or less, which is predetermined.
The wavelength is a wavelength at a portion where the curve of the spectral reflectance of the surface to be coated changes from a gentle slope to a steep slope and curves downward convexly .

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