Skin color expression method, skin color chart, and skin color display device

Abstract

To provide a novel technique for objectively recognizing a measured skin color.SOLUTION: Combinational coordinates of color component values representing a skin color of a subject are displayed as a point in a coordinate space using the color component values as an axis. The display method, the skin color chart representing the skin color of the subject, comprises two or more axis lines representing the coordinate space, a plurality of points present in the coordinate space and displaying the combinational coordinates of the color component values representing the skin color of the subject, and auxiliary figures, symbols and / or characters present in the coordinate space. The points are colored in a combination of the color component values representing the skin color of the subject, and the auxiliary figures, symbols and / or characters include a display representing a relation of the plurality of points.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a skin color representation method, a skin color chart, and a skin color display device. [Background technology]

[0002] In recent years, skin color, blemishes, redness, wrinkles, sagging, etc. have been detected to measure skin conditions in medical and cosmetic diagnoses. Among these, skin color (hereinafter simply referred to as skin color) is measured when evaluating the degree of aging and the effectiveness of makeup.

[0003] A common method for measuring skin color is to measure reflected light from the skin using a colorimeter or the like to detect the skin color. It is also possible to obtain an image including the skin and extract the skin color from the obtained skin image. For example, Patent Document 1 describes a colorimetric device that uses a color image input means such as a color video camera.

[0004] A method has also been proposed in which the skin color thus measured is used as an index for selecting cosmetics. Patent Document 2 discloses a skin map having axes showing color information such as brightness and hue, and describes a method for selecting a foundation that can be applied to the subject's skin based on the color information displayed on the skin map. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 3129502 [Patent Document 2] JP 2018-034064 A Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above-mentioned prior art, an object of the present invention is to provide a new technique for objectively recognizing measured skin color. In particular, an object of the present invention is to provide a new technique for visually recognizing the degree of change in skin color. [Means for solving the problem]

[0007] The present invention, which solves the above problem, provides a method for expressing a subject's skin color by displaying the coordinates of a combination of color component values ​​that indicate the subject's skin color as points in a coordinate space whose axes are the color component values. By using this method, the subject's skin color can be expressed objectively.

[0008] In a preferred form of the invention, there are three colour component values ​​and the coordinate space is three dimensional. By displaying the color component values ​​in a three-dimensional coordinate space, it is possible to express an objective skin color based on the three color component values.

[0009] In a preferred embodiment of the present invention, the combination coordinates include combination coordinates of color component values ​​at a first time point and combination coordinates of color component values ​​at a second time point after the first time point, and each combination coordinate is displayed as a first point and a second point in the same coordinate space. By adopting such a format, the change in skin color over time can be displayed in the same coordinate space, and the change in skin color can be easily recognized.

[0010] In a preferred embodiment of the present invention, a graphic indicating a direction from the first point to the second point is further displayed between the first point and the second point. By displaying such a figure, it becomes easier to visually grasp the sequence of changes in the subject's skin color.

[0011] In a preferred embodiment of the invention, the color component values ​​are representative of the skin color of a predetermined area of ​​the subject's skin. By adopting such a configuration, it is possible to detect an average skin color that is not affected by uneven skin color of the subject.

[0012] In a preferred embodiment of the present invention, the color component values ​​are obtained using a spectrophotometer or a tristimulus value direct reading color difference meter. By using a spectrophotometer or a tristimulus value direct reading color difference meter, color component values ​​can be obtained without being affected by the measurement environment.

[0013] In a preferred embodiment of the invention, the colour component values ​​are obtained from a skin image of the subject. By using a skin image, the range for obtaining color component values ​​within a captured image can be freely set.

[0014] In a preferred embodiment of the invention, the color component values ​​are L * Value, a * Value, b * value. Color component value L * Value, a * value and b * By using this value, skin color can be appropriately expressed.

[0015] In a preferred embodiment of the present invention, the points are colored in a color representative of the subject's skin color. By adopting such a configuration, even if the skin color of the subject is expressed only in the coordinate space, the actual skin color of the subject can be confirmed at the same time.

[0016] In a preferred embodiment of the present invention, the points are circular or elliptical and are colored with shading based on a color representative of the subject's skin color so that the points appear three-dimensional. By adopting such a configuration, the visibility of the points displayed in the coordinate space is improved.

[0017] In a preferred embodiment of the present invention, a skin image of the subject is further displayed alongside the coordinate space. By adopting such a configuration, it is possible to compare the skin color obtained by visually viewing the skin image with the objective and unambiguous skin color obtained from the display of the coordinate space. Also, by making the display of the skin image and the display of the coordinate space visible at the same time, it is possible to corroborate the sensory color information obtained by visually viewing the skin image with the color information obtained from the display of the coordinate space, thereby improving the visibility of the skin color.

[0018] The present invention also provides a skin color chart for expressing a skin color of a subject, comprising: Two or more axes that indicate a coordinate space; a plurality of points that exist in the coordinate space and represent combination coordinates of color component values ​​that indicate the skin color of the subject; Auxiliary figures, symbols and / or characters existing in the coordinate space; the points are colored with a combination of the color component values ​​indicative of the subject's skin color; The auxiliary figures, symbols and / or characters include an indication of the relationship between the multiple points. The skin color chart allows the relationship between a number of points indicating skin color to be recognized at a glance.

[0019] The present invention also includes a color component value acquisition unit for acquiring color component values ​​indicating a skin color of a subject; a skin color display unit that displays, in a coordinate space, a combination coordinate of the color component values ​​acquired by the color component value acquisition unit. Effect of the Invention

[0020] According to the present invention, a novel technique can be provided that allows the skin color of a subject to be objectively recognized. In particular, a novel technique can be provided that allows the change in skin color to be objectively grasped and the degree of the change in skin color to be visually recognized. [Brief description of the drawings]

[0021] [Figure 1]1A and 1B are diagrams showing one embodiment of the shape of a point in the present invention, in which (a) a flat circular shape, (b) a shape in which a circle is shaded to resemble a sphere, and (c) a shape in which a circle is shaded to resemble a squashed sphere. [Diagram 2] 1 is a hardware block diagram showing an embodiment of a skin-color display device of the present invention; [Diagram 3] FIG. 1 is a diagram showing a skin color chart of a subject in an example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, an embodiment of the present invention will be described in detail. The method of expressing a subject's skin color of the present invention (hereinafter simply referred to as a skin color expression method) is a method of displaying a combination coordinate of color component values ​​detected from the subject's skin in a coordinate space with each color component value as a coordinate axis. The present invention also relates to a skin color chart and a skin color display device related to the implementation of the skin color expression method.

[0023] <1> How to express skin color In the skin color expression method of the present invention, color component values ​​are measured from the skin of a subject, and a combination coordinate of the measured color component values ​​is determined. In the present invention, the color component values ​​refer to various parameters that constitute a color. Examples of such color component values ​​include components that constitute color systems such as the CIE color system, the Munsell color system, the Ostwald color system, the NCS (Natural Color System), and the PCCS. In the present invention, it is preferable to obtain color component values ​​in the CIE color system in particular, from the viewpoint that the values ​​reflect the light source color.

[0024] The CIE color system includes the RGB color system, the XYZ color system, and the L * u * v * Color system, L * a * b * In the present invention, the L * a * b * It is preferable to obtain color component values ​​in a color system.

[0025] In the skin color representation method of the present invention, color component values ​​may be obtained from any part of the skin, but it is preferable to obtain color component values ​​from a part of the face, such as the cheek, forehead, etc. Furthermore, the color component values ​​may be obtained from bare skin, or from skin to which a cosmetic such as makeup has been applied.

[0026] The color component values ​​can be measured by irradiating the skin of a subject with any light and measuring the reflected light with a colorimeter such as a spectrophotometer or a tristimulus value direct reading color difference meter. Preferably, a colorimeter that complies with the industrial standard (JIS Z-8722, Method for Measuring Object Color) is used.

[0027] In addition, the measurement area of ​​the skin is not particularly limited, and the skin color may be measured from any one area, or from multiple areas. For example, when measuring skin color using a spectrophotometer with a measurement diameter MAV (7 to 11 mm), the color may be measured from only one arbitrary point on the skin, or a predetermined measurement range may be set and the color may be measured from multiple points within the measurement range.

[0028] When measuring skin color using a colorimeter or the like, it is preferable to measure skin color from multiple regions in order to detect a skin color that is close to the actual appearance impression, and the measurement regions are preferably 1 to 13 locations, more preferably 2 to 8 locations, and even more preferably 4 to 5 locations. In addition, skin color may be measured at multiple locations from different areas of the skin; for example, 1 to 3 locations on the forehead and 4 to 5 locations on each cheek, for a total of 9 to 13 locations, or 4 to 5 locations on one cheek.

[0029] When color is measured from multiple points, the representative value of the color component values ​​can be calculated from the multiple color component values ​​obtained, and the color component values ​​used in the present invention can be determined. The representative value of the color component values ​​can be the average value, median value, most frequently occurring value, etc. of each color component value, and it is particularly preferable to use the average value of the color component values. When color measurement is performed from only one arbitrary region, the measured color component value becomes the representative value of the color component value as it is.

[0030] The area of ​​the skin measurement range is not particularly limited, but from the viewpoint of accurately detecting skin color, the total area (when measuring from multiple measurement areas, the total area) is preferably 0.05 cm 2 More than 0.2cm, preferably 0.2cm 2 More preferably, 0.5 cm 2 It is preferable that the amount is equal to or more than that.

[0031] Alternatively, the color component values ​​can be obtained by extracting the color component values ​​from a skin image. The image can be obtained using a conventional imaging device such as a digital camera, a digital microscope, a digital video, or a scanner.

[0032] The color component values ​​can be extracted by using existing image processing software, etc. As the image processing software, any known software such as Photoshop (registered trademark) (manufactured by Adobe) may be used.

[0033] The extraction range of the color component values ​​can be any shape, for example, a rectangle, a square, a circle, an ellipse, or a shape drawn freehand, depending on the measurement site, etc. The extraction range may be set to only one area, or may be set to multiple areas separated from each other.

[0034] The total area of ​​the range for extracting color component values ​​is not particularly limited, but is preferably 0.05 cm 2 More than 0.5cm, preferably 0.5cm 2 More than 1cm, preferably 1cm 2 More than 2cm, more preferably 2 That's all. By determining the extraction range of the color component values ​​in this manner, it is possible to detect a skin color that is close to the actual appearance.

[0035] When color component values ​​are obtained from an image, a representative value of the extracted color component values ​​can be used as a combination coordinate to be displayed in a coordinate space. That is, the extraction range of the color component values ​​of the image can be divided into any number of sections, the color component values ​​of each section can be extracted, and a representative value calculated based on the extracted color component values ​​can be used as the color component value used in the present invention. Here, the representative value of the color component values ​​can be the average value, median value, most frequently occurring value, etc. of each color component value, and it is particularly preferable to use the average value of the color component values.

[0036] It is also preferable to acquire color component values ​​while avoiding areas that should be removed when detecting skin color, such as moles, scars, and other wounds. When acquiring color component values ​​from an image, any area of ​​the skin may be removed after acquiring a skin image, and then the color component values ​​of the skin may be acquired.

[0037] In the skin color representation method of the present invention, the above-mentioned color component values ​​are combined to display the skin color of the subject in a coordinate space. That is, each color component value indicates a value on each coordinate axis, and the skin color is displayed in the coordinate space as a combination coordinate of the color component values ​​(hereinafter, simply referred to as the combination coordinate). For example, CIEL * a * b * When skin color is measured using a color system, the color component value is L * Value, a * Value, b * The combination coordinates are L * Value, a * Value, b * A point in three-dimensional coordinate space consisting of each value of the value (e.g., combination coordinate = (L * :71.76,a * :12.69,b * :20.38).

[0038] In addition, in the skin color representation method of the present invention, the selected color component values ​​are set to two or more, and the combined coordinates are displayed in a two- or more-dimensional coordinate space, but preferably the combined coordinates are displayed in a three-dimensional coordinate space. By making the coordinate space three-dimensional, the subject's skin color can be accurately represented using the CIE color system composed of three color component values.

[0039] In the skin color representation method of the present invention, two or more types of combined coordinates can be displayed within the same coordinate system. The two or more types of combined coordinates may represent skin colors of different skin regions, or may represent skin colors at different times in the same skin region.

[0040] For example, when showing skin color at different points in time in the same skin area, the skin color at a certain point in time (a first point in time) is measured from a specific skin area, and then the skin color is measured again from the same skin area later (i.e., a second point in time), and the combined coordinates of both are displayed in the same coordinate space, thereby making it possible to express changes in the color of a specific skin area.

[0041] Here, the skin color representation method of the present invention is not limited to displaying only one set of combined coordinates of the first and second time points, but may display two or more sets of combined coordinates of the first and second time points. That is, the skin color of the same region of the subject may be measured two or more times over time, and all of the combined coordinates may be displayed in the same coordinate space.

[0042] In this way, by measuring the skin color over time for the same skin area and displaying a plurality of extracted combination coordinates side by side, it becomes possible to visually grasp the change in skin color over time. This display method can be used to display whether there is a change in skin color when skin care products, medicines, etc. are continuously applied to the skin.

[0043] An example of the above embodiment is a display that compares skin color before and after the use of cosmetics. That is, by measuring the skin color of the skin before the use of cosmetics (a first time point), and measuring the skin color of the same skin area after the use of cosmetics (a second time point), and displaying the combined coordinates of both in the same coordinate space, it is possible to express the change in skin color due to the use of cosmetics.

[0044] In addition, by measuring skin color at multiple points in time, such as before using the cosmetic product, one week after use, and two weeks after use, and displaying the combined coordinates representing each skin color in the same coordinate space, it is possible to express the change in skin color over time due to the use of the cosmetic product.

[0045] The above-mentioned cosmetic may be any of basic cosmetic products used for skin care, such as lotion, milky lotion, and serum, and makeup cosmetic products, such as foundation and base, but the present invention is preferably used to display the change in skin color before and after the use of a basic cosmetic product, i.e., to display the change in bare skin color.

[0046] The skin color display method of the present invention can also be used to display the skin colors of different skin regions. For example, the skin color is measured from a specific skin region (first skin region) and from a skin region (second skin region) different from the first skin region, and the combined coordinates of both are displayed in the same coordinate space, thereby making it possible to display the color of each skin region in a contrasting manner.

[0047] The combined coordinates of the present invention are represented by points occupying positions in coordinate space. The points may be any graphic or symbol, but are preferably circular or elliptical in shape. Figures 1(a)-(c) show an embodiment of a circular point of the present invention.

[0048] It is preferable that the outline and / or the inside of each point is colored with a representative color of the subject's skin color. Here, the representative color of the skin color may be a color based on a combination coordinate of color component values ​​acquired for display in the coordinate space, or may be a color based on a skin image acquired from the subject. Statue? In the case where the representative color of the skin color is separately obtained from the skin image, similarly to the above-mentioned case of extracting the representative value of the skin color from the skin image, the average value, median, most frequent value, or the like of the color component values ​​in a certain region of the skin image is calculated to obtain the representative value of the skin color, and the color represented by a combination of the representative values ​​of the color component values ​​can be set as the representative color of the skin color. By coloring the points with a representative color of the subject's skin, the subject's actual skin color can be confirmed simply by displaying the coordinate space.

[0049] The points may be colored in a single color so as to appear two-dimensionally as shown in Fig. 1(a), or may be colored in a three-dimensional manner with shading as shown in Fig. 1(b) and (c). By displaying the points three-dimensionally, the visibility of the points in the coordinate space is improved.

[0050] In the present invention, the points are preferably three-dimensional shapes that are shaded circles colored the skin color of the subject, and more specifically, they are preferably shaded to resemble spheres (FIG. 1(b)) or squashed spheres (FIG. 1(c)). By making the points into circles with shading as if they were squashed spheres, the shading is suppressed while maintaining the three-dimensional appearance of the points, and the measured skin color displayed inside the points can be more clearly recognized.

[0051] When multiple combined coordinates are displayed in the same coordinate space, figures, symbols, and / or letters (hereinafter simply referred to as auxiliary figures, etc.) indicating the relationship between each point may be added between or around the points indicating the combined coordinates. For example, when two or more points related to the same skin region are displayed and the points indicate a change in skin color, a symbol such as an arrow indicating the time series of the change can be added between the points. On the other hand, when two or more points related to different skin regions are displayed and the points are compared, letters or symbols indicating the skin color detection site at each point (e.g., forehead, nostrils, cheeks, chin, etc.) can be displayed around each point.

[0052] In the method for displaying skin color of the present invention, the coordinate space is preferably displayed on a two-dimensional plane on paper or a display.

[0053] Furthermore, the coordinate space represents the directions of the coordinate space by displaying axes corresponding to each color component value. In order to clarify the distribution of the points in the coordinate space, auxiliary lines parallel to each axis may be provided at regular intervals in the coordinate space as necessary.

[0054] The axis arrangement is CIEL * a * b * When expressing skin color in a three-dimensional coordinate space using a color system, * -b * a so that the coordinates are the base * axis and b * Position the axis and * -b * L extends vertically from the coordinates * It is preferable to place the axis in this way. By placing the axis in this way, * -b * The change in the saturation of the skin color is expressed by the change in the coordinate points, L * The change in the axial direction of the point can represent the change in brightness. In addition, a * -b * Change in coordinates of a point and L * It is also preferable to display auxiliary figures such as arrows and lines indicating the amount and direction of change of the points in the axial direction. By displaying such changes, the change in each color component value can be easily recognized.

[0055] The skin color representation method of the present invention may represent skin color by displaying a coordinate space including axis lines, points displayed based on color component values, and auxiliary figures (hereinafter simply referred to as coordinate space display), and may also display a skin image of the skin area from which the color component values ​​have been obtained. By making it possible to simultaneously view the skin image and the coordinate space display, it is possible to compare the skin color obtained by visually viewing the skin image with the objective and unambiguous skin color obtained from the coordinate space display. Furthermore, by corroborating the sensory color information obtained by visually viewing the skin image with the color information obtained from the coordinate space display, it is possible to improve the visibility of the skin color display.

[0056] In addition, when displaying multiple skin colors of a subject, a single coordinate space display showing multiple combination coordinates can be displayed side by side with multiple skin images. By displaying the skin images and the coordinate space display side by side in this way, the visual change in skin color recognized from the photograph and the objective change in skin color obtained from the coordinate space display can be displayed in a contrast manner.

[0057] When checking changes in skin color in the same skin area, simply displaying skin images side by side only allows the change in skin color to be perceived intuitively. Therefore, by displaying both the sensory change in skin color obtained by visually inspecting the skin images and the objective and unambiguous change in skin color based on the coordinate space display and backing up the information related to the skin images with the information related to the coordinate space display, the visibility of the change in skin color can be improved.

[0058] <2> Skin Tone Chart The skin color chart of the present invention includes axes indicating a coordinate space, a plurality of points that exist in the coordinate space and display coordinate combinations of color component values ​​that indicate the subject's skin color, and auxiliary figures, symbols and / or characters (i.e., auxiliary figures, etc.) that exist in the coordinate space.

[0059] The embodiment of the display format of the skin color chart of the present invention is as described above. <1> The description in the above can be cited.

[0060] The points showing the subject's skin color are: <1> As described in the above, the color component values ​​are displayed in the coordinate space based on the color component values ​​obtained by a spectrophotometer or the like. In the present invention, the color component values ​​are expressed in the CIEL * a * b * It is preferable to use three components of a color system, and it is also preferable that the points are colored in a representative color of the subject's skin color.

[0061] Axes in a coordinate space representation are lines that indicate the directions in the coordinate space and correspond to each color component value. * a * b *When expressing skin color in a three-dimensional coordinate space using a color system, * -b * a so that the coordinates are the base * axis and b * Position the axis and * -b * L extends vertically from the coordinates * It is preferable to arrange the axis.

[0062] In addition, the three-dimensional coordinate space may include auxiliary figures or the like that indicate the relationships between the points. Here, the display position of the auxiliary figures or the like is not limited to inside the axis line, and they may be located outside the axis line within a range that is recognized as being integrated with the coordinate space display.

[0063] Additionally, the skin color chart of the present invention preferably displays, together with the coordinate space display, a skin image of the skin region where the color component values ​​of the subject were measured.

[0064] The skin color chart of the present invention may be one that is displayed on a two-dimensional plane, and examples thereof include a form in which it is printed on any material such as paper or plastic, or a form in which it is displayed on a display or the like.

[0065] <3> Skin-colored display device The skin-color display device of the present invention is described below with reference to FIG. <1> The present invention is an apparatus for implementing the skin color expression method described in the above item. <1> The explanation in item 3 also applies to the following devices:

[0066] As shown in Figure 2, the skin color display device 1 of the present invention includes a color component value acquisition unit 12 that measures color component values ​​indicating the skin color of a subject, and a skin color display unit 13 that displays the combination coordinates of the color component values ​​acquired by the color component value acquisition unit in a coordinate space.

[0067] The color component value acquisition unit 12 detects color component values ​​from the subject's skin. A colorimeter such as a spectrophotometer or a tristimulus value direct reading color difference meter can be used to detect color components. The color component value acquisition unit 12 may also extract color component values ​​from a previously acquired skin image.

[0068] The skin color display unit 13 is a display that displays in a coordinate space the combination coordinates detected by the color component value acquisition unit 12. The skin color display unit 13 may display a plurality of combination coordinates.

[0069] Furthermore, the skin color display device 1 of the present invention may further include an image acquisition unit 11 that acquires a skin image. The image acquisition unit 11 may be a normal imaging device such as a digital camera, a digital microscope, a digital video, or a scanner. The image acquisition unit 11 may be configured to transmit the captured skin image to the skin color display unit 13, and to display the coordinate space display and the skin image side by side on the skin color display unit 13.

[0070] When the color component values ​​are acquired from a skin image, the image acquiring unit 11 and the color component value acquiring unit 12 may be integrated together. That is, the skin color display device 1 of the present invention may be provided with a section that performs a series of steps of acquiring a skin image and acquiring color component values ​​from the skin image all at once. EXAMPLES

[0071] <How to display changes in skin color in 3D space> Using a spectrophotometer (CM-700d, measuring diameter: MAV (8 mm), manufactured by Konica Minolta, Inc.), color component values ​​were measured for multiple areas of the subject's cheek, and the average value was calculated. The average value of the calculated color component values ​​was used as the color component value to be used for the coordinate space display. The color component values ​​were expressed in CIEL * a * b * The three components of the color system were obtained.

[0072] After that, cosmetics (serum) were applied to the subjects' skin, and after two months, the skin color component values ​​were measured again from the same area using the same method as above. Skin images showing the skin condition were also taken before and after the use of the cosmetics.

[0073] FIG. 3 shows a skin color chart 2 including a skin image display 21 that displays a skin image of a subject, and a coordinate space display 22 that displays the skin color of the subject in a three-dimensional coordinate space. The coordinate space display 22 is a portion that displays a point 221 that indicates a combination coordinate of color component values ​​of skin color in a three-dimensional coordinate space. The coordinate space is a * -b * The coordinates are the base, and a * -b * The axis extending perpendicularly from the coordinate system is called L. * In addition, as the points 221, a point 221a showing the skin color before the use of the cosmetic material and a point 221b showing the skin color after the use of the cosmetic material are displayed in the same space.

[0074] The point 221 is represented by a sphere with shadows and highlights, and the inside of the sphere is colored with a representative skin color obtained from the skin image. * a * b * The three components of the color system were obtained, and the color represented by the average value of each color component was set as the representative skin color. This makes it possible to express the difference in skin color caused by the use of cosmetics by both the display position of point 221 and the color of the sphere.

[0075] Additionally, an arrow 222a is displayed between point 221a before the use of the cosmetic product and point 221b after the use of the cosmetic product, indicating the direction of change to point 221b after the use of the cosmetic product. The arrow 222a makes it possible to express the change over time before and after the use of the cosmetic product without adding any special explanation.

[0076] Similarly, a * -b * The arrow 222b indicating the difference in color component values ​​on the plane is * -b *The arrow 222b indicates the lightness (L * ) can be used to express changes in color (saturation) excluding

[0077] And the lightness (L * ) from each point 221, a * -b * L towards the plane * Dotted lines 222c parallel to the axis are displayed. By comparing the lengths of the dotted lines 222c, differences in brightness can be expressed.

[0078] In this way, even if a color change is difficult to visually recognize by comparing the skin images, the degree of the change in skin color can be easily recognized by expressing the skin color in the coordinate space display 22. In addition, by displaying the skin image display 21 together, the degree of the change in skin color can be compared with the impression of the actual skin color. [Industrial Applicability]

[0079] The present invention can be applied to diagnosis of skin conditions in the fields of cosmetics and medicine, evaluation of cosmetic effects, and devices used therefor. [Explanation of symbols]

[0080] 1. Skin-colored display device 11 Image acquisition section 12 Color component value acquisition unit 13 Skin color display section 2 Skin Tone Chart 21 Skin image display 22 Coordinate Space Display 221 Points 221a Points to note before using cosmetics 221b Points to note after using cosmetics 222a Arrow 222b Arrow 222c Dotted line

Claims

1. A coordinate system for displaying a combination of color component values ​​representing the skin color of the subject as points in a coordinate space displaying axes corresponding to the color component values; The color component values ​​are The total area of ​​the extraction range of the color component values ​​is 0.05 cm ２ or the above, or the total area of ​​the measurement range of the color component values ​​is less than 0.05 cm2, obtained using a spectrophotometer or a tristimulus value direct reading color difference meter. ２ All of the above, the combination coordinates include combination coordinates of the color component values ​​at a first time point and combination coordinates of the color component values ​​at a second time point after the first time point; Each combination coordinate is displayed as a first point and a second point in the same coordinate space, the first point being a skin color before use of the cosmetic, skin care product, and / or pharmaceutical product, and the second point being a skin color for the same skin area after use of the cosmetic, skin care product, and / or pharmaceutical product; coloring the first point and the second point in a color that is a representative color of the subject's skin color; the first point and the second point are circular, and are represented by circles shaded like squashed spheres based on the representative color of the skin color so that the first point and the second point appear three-dimensional; A method for expressing the skin color of a subject by displaying a figure indicating a direction from the first point to the second point between the first point and the second point.

2. The method of claim 1 , wherein the color component values ​​are three and the coordinate space is three-dimensional.

3. The method of claim 1 or 2, wherein the color component values ​​are representative of skin color of a predetermined area of ​​the subject's skin.

4. the color component values ​​are obtained using a spectrophotometer or a tristimulus value direct reading color difference meter; The method according to any one of claims 1 to 3, wherein the number of areas measured by the spectrophotometer or the tristimulus value direct reading color difference meter is 1 to 13.

5. The color component value is L ＊ Value, a ＊ Value, b ＊ The method according to any one of claims 1 to 4, wherein the value is

6. The method according to any one of claims 1 to 5, further comprising measuring skin colour over time for the same skin area in the skin image of the subject and displaying the measured skin colour alongside the coordinate space.

7. A skin color chart representing the skin color of a subject, comprising: Two or more axes that indicate a coordinate space; a first point and a second point that exist in the coordinate space and represent coordinate combinations of color component values ​​that indicate the skin color of the subject; The color component values ​​are The total area of ​​the extraction range of the color component values ​​is 0.05 cm ２ or above, or a spectrophotometer or a tristimulus value direct reading color difference meter is used to measure a total area of ​​0.05 cm ２ obtained from the above, the combination coordinates include combination coordinates of the color component values ​​at a first time point and combination coordinates of the color component values ​​at a second time point after the first time point; expressing each combination coordinate as the first point and the second point in the same coordinate space; the first point being a skin color before use of a cosmetic, skin care product, and / or pharmaceutical product, and the second point being a skin color for the same skin area after use of a cosmetic, skin care product, and / or pharmaceutical product; An auxiliary figure, a symbol and / or a character existing in the coordinate space; the first point and the second point are colored with a combination of the color component values ​​indicative of a skin color of the subject; The first point and the second point are represented by circles with shading like squashed spheres so that they appear three-dimensional, A skin color chart, wherein the auxiliary figure, symbol and / or character includes a graphical display between the first point and the second point indicating a direction from the first point to the second point.

8. a color component value acquiring unit for acquiring a color component value indicating a skin color of a subject; a skin color display unit that displays, in a coordinate space, a combination coordinate of the color component values ​​acquired by the color component value acquisition unit; Equipped with The color component values ​​are The total area of ​​the extraction range of the color component values ​​is 0.05 cm ２ or above, or a spectrophotometer or a tristimulus value direct reading color difference meter is used to measure a total area of ​​0.05 cm ２ obtained from the above, the combination coordinates include combination coordinates of the color component values ​​at a first time point and combination coordinates of the color component values ​​at a second time point after the first time point; Each combination coordinate is displayed as a first point and a second point in the same coordinate space, the first point being a skin color before use of the cosmetic, skin care product, and / or pharmaceutical product, and the second point being a skin color for the same skin area after use of the cosmetic, skin care product, and / or pharmaceutical product; coloring the first point and the second point in a color that is a representative color of the subject's skin color; the first point and the second point are circular, and are represented by circles shaded like squashed spheres based on the representative color of the skin color so that the first point and the second point appear three-dimensional; a skin-colored display device that displays a figure between the first point and the second point, the figure indicating a direction from the first point to the second point;

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