JPH04279830A - Skin-color/age evaluation device - Google Patents

Abstract

PURPOSE:To objectively evaluate the color of a human skin by measuring the condition of the skin color, and to enable an optimum skin dressing on the basis of the evaluated value thereof. CONSTITUTION:The reflected light from the skin of a human being in a visible wavelength range is measured by a light-measuring part 1, and the light- measuring part 1 outputs a signal corresponding to the intensity of the reflected light, and it is input into a calculating part 2 to calculate the reflection factor. The reflection factor calculated by the calculating part 2 is input to a function transforming part 3, and in the function transforming part 3 it is converted into an age being in corresponding relationship with the reflection factor, and the age is output to a display part 4 as a signal, and the age corresponding to the signal emitted from the function transforming part 3 is displayed on the display part 4.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a skin color age evaluation device for easily evaluating a person's skin color age based on the reflectance, chromaticity value, and reflectance of a single wavelength of the human skin.

0002

BACKGROUND OF THE INVENTION As technology advances, people are increasingly seeking a richer life. Along with this trend, not only women but also men are starting to wear makeup.

[0003]Furthermore, human skin color has an important meaning as the most important color reproduction color in photography and printing.

[0004] On the other hand, human skin becomes more blotchy, darker, and yellowish with age, so by knowing the age of a person's skin color through physical measurements, one can objectively accurately assess one's own skin condition. It has become important to be able to understand and treat your skin in a way that suits your skin and according to your own preferences. To that end, we can easily measure our own skin.
There has been an increasing need to evaluate skin color age.

[0005]

[Problem to be solved by the invention] However, currently,
There is no skin color age evaluation device that evaluates skin color age by measuring skin reflectance, chromaticity value, and single wavelength reflectance. As a result, it is not possible to objectively understand the condition of one's own skin, easily take care of it to suit each individual's skin, or treat one's own skin according to one's own preferences based on objective grounds. Ta.

The present invention solves the above problems and aims to provide a skin color age evaluation device.

[0007]

[Means for Solving the Problems] A first means of the present invention for achieving the above object is in the visible wavelength range (380 to 780
A photometer measures the reflected light of human skin at 100 nm), calculates reflectance from the intensity of the measured reflected light, and converts the calculated skin reflectance to the corresponding skin color age via a function converter. The converted skin color age value is then displayed on the display section to evaluate the human skin color.

[0008] Also, the second means is a visible wavelength range (380
The light reflected from human skin in the wavelength range (up to 780 nm) is measured by the photometer, and the spectral reflectance and chromaticity value of the skin color are calculated by the calculation unit from the intensity of the reflected light in each measured wavelength range. The chromaticity value is converted into a corresponding skin color age via a function conversion section, and the converted skin color age value is displayed on a display section to evaluate human skin color.

Furthermore, the third means is a visible wavelength range (38
The light reflected from human skin in the wavelength range (0 to 780 nm) is measured by the photometer, and the spectral reflectance is calculated by the calculation unit from the intensity of the reflected light in each measured wavelength range. converting the skin color age value to the skin color age value through the function conversion unit, displaying the converted skin color age value on the display unit,
It is designed to evaluate human skin color.

0010

[Operation] According to the first means described above, the reflectance of human skin changes with age, so it is effective to evaluate skin color age using the relationship between skin reflectance and age. It is. Therefore, if we collect a large number of human skin reflectance values and find the age corresponding to the skin reflectance through data analysis, we can use the actual measured value of each person's skin reflectance to determine the age corresponding to that value as the skin color age. It is possible to evaluate.

[0011] Furthermore, the present invention uses the above-mentioned second means to evaluate the skin color age of each person by using the relationship between the chromaticity value of the skin color and age, since the skin color of humans changes with age. is also valid. Generally, as a person ages from young to old, the color of the skin changes from reddish to yellowish, and the brightness gradually decreases and becomes darker. Therefore, by measuring the chromaticity value of skin color, it is possible to determine the age corresponding to the chromaticity value of Japanese skin color, and evaluate the determined age as the skin color age.

Furthermore, the present invention uses the above-mentioned third means to investigate the relationship between age and the reflectance in the wavelength band that changes the most with age, since the spectral reflectance distribution of human skin changes with age. It is also effective to use the reflectance of human skin in a certain wavelength band as an index of skin color age. In general, as we move from youth to old age, the spectral reflectance of short wavelengths decreases, and by measuring the human reflectance at a wavelength of 400 nm, where there is the most significant difference, we found that it corresponds to the reflectance of Japanese skin at 400 nm. It is possible to determine the age and evaluate the determined age as the skin color age.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A skin color age evaluation device according to an embodiment of the present invention will be described below with reference to the drawings.

(Example 1) It is known that a person's skin color changes as they age (for example, Ichiro Sonoda et al., "On skin color and preference for makeup cosmetics in Japanese women"). Cosmetic Magazine, 21, 3, (1987), 2
(pages 19-224). The reflectance of human skin is highest in our twenties, and then gradually decreases.

[0015] Therefore, we collected the actual values of cheek skin color measured using a spectrophotometer for Japanese women over the age of 20 from several documents, and averaged them for each age. was converted to cheek reflectance. Actual measurements of the skin color of women's cheeks cited from literature are for approximately 900 women of all ages.

FIG. 2 shows the relationship between cheek reflectance and age of Japanese women obtained through data analysis. In FIG. 2, the horizontal axis represents age, and the vertical axis represents the measured average reflectance of female skin color. From FIG. 2, reflectance decreases as age increases, and skin color age can be evaluated from cheek reflectance.

An embodiment of the skin color age evaluation device according to the present invention will be described with reference to FIG. In FIG. 1, 1 is a photometry section, 2
3 is a calculation section, 3 is a function conversion section, and 4 is a display section. The photometry section 1 photometers the radiant flux of light reflected from human skin in the wavelength range of 380 to 780 nm in the visible light range, and outputs a signal corresponding to its intensity. The calculation section 2 calculates the reflectance from the input signal from the photometry section 1. The function conversion unit 3 outputs the age that corresponds to the reflectance as a signal based on the functional relationship shown in FIG. 2 as an input signal from the calculation unit 2. The display section 4 displays the age value corresponding to the signal from the function conversion section 3. The display unit 4 shows the skin color age of the person whose displayed value is measured. With this configuration, it is possible to realize a device that evaluates the age of a woman's skin color, and by simply physically measuring the skin color, it can be used as a powerful clue to care for each person according to their skin color. be able to.

(Example 2) The average of the data of the actual measurements of Japanese women shown in FIG.
Converted to y chromaticity value. Figure 3 shows the relationship between the chromaticity values of the cheeks of Japanese women and their age, obtained through data analysis. In FIG. 3, the horizontal axis indicates the x chromaticity value of the measured female skin color,
The vertical axis indicates the measured y-chromaticity value of female skin color. In FIG. 3, the chromaticity value changes as age increases, and the skin color age can be evaluated from the chromaticity value of the cheek. Skin color age based on actual skin color measurements can be determined by finding the intersection of the curve in Figure 3 with a line drawn perpendicular to the curve from the point obtained from the actual skin color measurement value, and interpolating the existing intersection at that intersection. can be found.

Embodiment 2 of the skin color age evaluation device according to the present invention
will be explained based on FIG. 1 as in the first embodiment. In FIG. 1, 1 is a photometry section, 2 is a calculation section, 3 is a function conversion section, and 4 is a display section.
This embodiment is the same as the first embodiment up to the point where the radiation flux of the reflected light from the human skin in the wavelength range of ) is photometered and a signal corresponding to the intensity thereof is output. The calculation unit 2 calculates CIE (1931) x, y chromaticity values from the input signal from the photometry unit 1. The function conversion section 3 receives the signal from the calculation section 2, and outputs the age corresponding to the chromaticity value as a signal based on the functional relationship shown in FIG. Display section 4 is function conversion section 3
Display the age value corresponding to the signal from. The value displayed on the display unit 4 indicates the skin color age of the measured subject. With this configuration, an apparatus for evaluating a woman's skin color age can be realized, and the skin color can be easily and physically measured as in the first embodiment.

(Example 3) The average of the actual skin color data of Japanese women cited from the above-mentioned literature was calculated by CIE (193
1 year) After converting to x, y chromaticity values, JIS Z 8
The spectral reflectance of Japanese women's cheeks was predicted from the x and y chromaticity values according to the formula for calculating the spectral reflectance of 726 facial colors.

FIG. 4 shows the relationship between wavelength and the ratio obtained by dividing the spectral reflectance of a 20-year-old Japanese woman's cheek by the spectral reflectance of a 50-year-old Japanese woman's cheek, obtained by data analysis. Figure 4
, the horizontal axis represents the wavelength, and the vertical axis represents the ratio of the spectral reflectance of the cheek of a 20-year-old Japanese woman divided by the spectral reflectance of the cheek of a 50-year-old Japanese woman obtained by data analysis. Similarly to Figure 4, by dividing the spectral reflectance of the cheeks of Japanese women of each age by the spectral reflectance of the cheeks of a 50-year-old Japanese woman, as the age increases, the shorter the wavelength, the larger the difference becomes. Skin color age can be evaluated from reflectance. Here, in a wavelength band of less than 400 nm, noise is likely to be mixed into the data, so it is not easy to obtain reliable data. Therefore, it is best to evaluate at 400 nm.

FIG. 5 shows the relationship between the measured value of cheek reflectance at 400 nm at each age divided by the spectral reflectance of a 50-year-old cheek and skin color age. The horizontal axis represents age, and the vertical axis represents the ratio of the measured cheek reflectance at each age at 400 nm divided by the spectral reflectance of a 50-year-old cheek. Figure 5
As age increases, the value obtained by dividing the actual value of cheek reflectance at 400 nm for each age by the spectral reflectance of a 50-year-old cheek increases, and skin color age is evaluated from the ratio of cheek reflectance at 400 nm. I was able to do that.

An embodiment of the skin color age evaluation device according to the present invention will be described with reference to FIG. In FIG. 1, 1 is a photometric section, 2 is a calculation section, 3 is a function conversion section, and 4 is a display section.
It is the same as in Examples 1 and 2 up to the point where it measures the radiant flux of 400 nm in the visible light range and outputs a signal corresponding to its intensity. The calculation unit 2 inputs the signal from the photometry unit 1 and calculates the reflectance of the cheek of a 50-year-old at 400 nm as 0.13.
Divide by 0 to calculate the ratio of cheek reflectance at 400 nm. The function conversion section 3 receives the signal from the calculation section 2, and outputs the age corresponding to the ratio as a signal based on the functional relationship shown in FIG. The display section 4 displays the age value corresponding to the signal from the function conversion section 3. The value displayed on the display unit 4 indicates the skin color age of the measured subject. By configuring like this,
A device for evaluating a woman's skin color age can be realized, and skin color can be easily and physically measured as in Examples 1 and 2.

[0024]

[Effects of the Invention] As is clear from the above description, according to the present invention, it is possible to realize a skin color age evaluation device for knowing the degree of skin color age of each person, and to perform care tailored to each person's skin color. This can provide a strong clue.

[Brief explanation of the drawing]

[Fig. 1] Block diagram of a skin color age evaluation device of the present invention

[Figure 2
] Diagram showing the relationship between age and cheek reflectance

[Figure 3] CIEx
, a diagram showing the relationship of age on the y chromaticity coordinate

[Figure 4] Diagram showing the relationship between the ratio of spectral reflectance of the cheeks of 20-year-old and 50-year-old women and wavelength

[Figure 5] Diagram showing the relationship between the spectral reflectance of the cheek at 400 nm for each age, the value divided by the spectral reflectance of the cheek of a 50-year-old, and each age.

[Explanation of symbols]

1 Light receiving part 2 Arithmetic section 3 Function conversion section 4 Display section

Claims (3)

[Claims] 1. A photometric unit that measures light reflected from human skin in the visible wavelength range (380 to 780 nm), a calculation unit that calculates reflectance from the intensity of the measured reflected light, and a calculated skin reflection. A skin color age evaluation device comprising: a function conversion section that converts a skin color age value from a skin color age value; and a display section that displays the converted skin color age value. 2. A photometry unit that measures the light reflected from human skin in the visible wavelength range (380 to 780 nm), and calculates the spectral reflectance and chromaticity value of the skin color from the intensity of the measured reflected light in each wavelength range. A skin color age evaluation device comprising: a calculation unit that converts the calculated skin color chromaticity value into a corresponding skin color age; and a display unit that displays the converted skin color age value. . 3. A photometric unit that measures light reflected from human skin in the visible wavelength range (380 to 780 nm); a calculation unit that calculates spectral reflectance from the intensity of the measured reflected light in each wavelength range; A skin color age evaluation device comprising: a function converter that converts the spectral reflectance at 400 nm into a corresponding skin color age; and a display unit that displays the converted skin color age value.