JPH1073490A - Device for measuring brightness and color tone of skin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To measure the relative brightness and color tone based on reference brightness and color tone accurately only by measuring reflecting optical intensity even when the irradiated optical intensity of each light emitting element is different. SOLUTION: Red light and green light are sequentially cast from a light transmitting part 3 formed on the tip of a probe 2 on the measuring part of skin and also irradiated on the optical axis of a photodetector 4 at a equal angle. This device is formed in this way. Therefore, the respective intensity of reflected light can be individually measured with one photodetector 4 and can be measured at the same time under the equal reflecting condition. Furthermore, a color-reflection optical intensity is normalized by respective standard reflected light intensities Ro and Go when the red light and the green light are irradiated on a standard measuring object surface. Therefore, even when the optical irradiation intensities of respective light emitting elements 5R and 5G are different, the relative reflected light intensities can be accurately measured. Then, the brightness of the skin, which is indicated by the sum of the respective normalized reflected-light intensities R and G, and the color tone of the skin, which is indicated by the difference of the above described respective color normalized reflected-light intensities R and G, are displayed stepwise.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cosmetics department which sells cosmetics when determining the optimal foundation color according to the brightness and hue of the customer's skin. The present invention relates to a skin brightness and color tone measuring device used for objective measurement.

[0002]

2. Description of the Related Art A foundation used for skin color makeup of the entire face hides spots and freckles formed on the face, restores the color of the sun-burned skin to its original color, and makes rough skin look smooth. In this case, if the color of the foundation can be made to match the clean skin color before the formation of spots or freckles, an extremely natural skin color makeup without unnaturalness can be obtained.

[0003] However, the number of colors of the foundation is extremely large. Usually, the color of the foundation is determined by seeing the back of the hand or the face to see what kind of color is obtained. It is extremely difficult to find the optimal color foundation. In addition, the beauty staff at each store also advises on the optimal color, but it is still difficult to select the optimal foundation for the customer's skin color. There were many places. In this case, if the skin color can be objectively known, it can be used as an index for selecting the optimal color foundation, and the beautiful skin color before the formation of spots and freckles and the foundation can be determined. If we can objectively measure whether the skin color after wetting matches,
This is convenient because you can confirm that you have selected the optimal color foundation.

It is known that the skin color is determined by hemoglobin and melanin. Hemoglobin does not absorb light in the red wavelength range, has absorption in the green wavelength range, and melanin has a red to green wavelength range. Light absorption is widely observed in the region. Thus, the reflectance when illuminated with red light represents the absorption of melanin, and the reflectance when illuminated with green light is equal to the sum of the absorption due to hemoglobin and the absorption due to melanin. From this, the difference between the reflectance of green light and the reflectance of red light indicates hemoglobin absorption. If the difference is large, the concentration of hemoglobin is high and the skin becomes red. Color). Also, if the skin is bright, it reflects all color light, and if the skin is dark, it absorbs all color light, so the sum of the reflectance of red light and green light represents the brightness of the skin. I can say. Since the brightness of the skin is determined by melanin, it can be said that the brightness of the skin is expressed even when only the reflectance of red light is used instead of the sum of the reflectances of red light and green light. Thus, the brightness and color of the skin can be objectively measured from the reflectance of the red light and the green light.

[0005]

However, in order to measure the brightness and hue of the skin based on the reflectance of red light and green light, it is necessary to measure the intensity of the irradiation light and the intensity of the reflected light separately. In addition, the red light emitting element, the green light emitting element, and the respective light receiving elements for measuring the intensity of the illuminating light and the intensity of the reflected light must be built in the probe, so that the size of the probe becomes large, and thus the entire device becomes large. There is. In addition, when only the reflected light intensity is measured, the irradiation light intensity of each light emitting element varies, so that
The brightness and color of the skin cannot be measured accurately.

[0006] It is also possible to magnify and project the skin imaged using a CCD color camera or the like on a CRT display and measure the brightness and hue of the skin based on the brightness and hue of the entire image. There has been a problem that the apparatus main body has to be of a desktop type and becomes large. Therefore, it is good to use it permanently at a store, but if it is used as a sales promotion tool by, for example, a door-to-door salesperson, or if a beauty staff of a cosmetics maker responsible for a plurality of retail stores carries it, it is too large to carry. And the handling was inconvenient.

Accordingly, the present invention provides a method for measuring the relative light intensity based on the reference brightness and hue even when the illuminating light intensity of each light emitting element is different only by measuring the reflected light intensity without measuring the reflectance. Technology that can accurately measure skin brightness and color tone, and at the same time be extremely small and compact enough to be easily carried by a female beauty staff in a bag. Is a subject.

[0008]

In order to solve this problem, the present invention has a probe having a light-transmitting portion formed at the tip to be in contact with a measurement site on the skin. An optical path for guiding incident light from the light-transmitting portion to a light-receiving element is formed on an optical axis passing through the light-transmitting portion and perpendicular to the skin surface in a state where the tip is in contact with the measurement site of the skin, and a red light-emitting element. When irradiating the measurement site with the red light and the green light emitted from the green light emitting element through the light transmitting portion, an optical path for irradiating the respective color lights equiangularly with respect to the optical axis is formed. After sequentially measuring and storing the standard reflected light intensity of each color when the target surface is sequentially irradiated with red light and green light at a predetermined time difference, the red light and green light are applied to the measurement site of the skin to be measured at the predetermined time difference. The reflected light intensity of each color when sequentially irradiated with Measuring means for calculating and storing the reflected light intensities of the respective colors with the standard reflected light intensities of the respective colors to obtain the normalized reflected light intensities of the respective colors, and thereafter calculating the sum and difference of the normalized reflected light intensities of the respective colors. And display means for displaying the brightness and hue of the skin represented by the sum and difference of the normalized reflected light intensities of the respective colors in a stepwise manner.

According to the present invention, since the red light and the green light are sequentially irradiated with a predetermined time difference from the light transmitting portion formed at the tip of the probe to the measurement site of the skin, one light reception is performed. The intensity of each reflected light can be measured individually by the element, and the entire apparatus can be reduced in size and weight. At this time, since the red light and the green light are radiated isometrically with respect to the optical axis of the light receiving element, the reflected light intensity of each color light irradiated to the same portion can be measured under the same reflection condition. In addition, there is no occurrence of measurement error due to different measurement conditions. In addition, the reflected light intensity of each color when the measurement site of the skin to be measured is irradiated with red light and green light is normalized by the reflected light intensity of each color when the red light and green light are irradiated on the standard measurement target surface. Accordingly, even when the light irradiation intensities of the red light emitting element and the green light emitting element are different, the relative reflected light intensity can be accurately measured. And
The brightness of the skin represented by the sum of the normalized reflected light intensities of each color and the skin tone represented by the difference between the normalized reflected light intensities of the respective colors are displayed in a stepwise manner. And the hue can be accurately measured.

According to a further preferred embodiment of the present invention,
Since the probe is integrally attached to the handy type apparatus main body, the measuring means and the arithmetic means are disposed in the apparatus main body, and the display means is disposed on the surface of the apparatus main body, so that the probe is formed as an all-in-one type. It can be made smaller and lighter so that female beauty staff can easily carry it in a handbag or the like.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described specifically. FIG. 1 is a perspective view showing a skin brightness and color tone measuring apparatus according to the present invention, FIG. 2 is a block diagram thereof, and FIG. 3 is an explanatory view showing an example of display means.

The skin brightness and color measuring device of this embodiment is
A probe 2 to be brought into contact with a skin measurement site is integrally attached to a side surface of a portable hand-held device main body 1. The probe 2 has a light-transmitting portion 3 formed at the tip thereof, which is in contact with a measurement site of the skin, and inside the probe 2, the light-transmitting portion 3 is orthogonal to the skin surface in a state of being in contact with the measurement site. A light receiving element 4 for receiving incident light from the light transmitting part 3 is provided on the optical axis X, a red light emitting element 5R for irradiating the light transmitting part 3 with red light and green light, and a green light emitting element. An element 5G is equiangularly arranged at an angle of about 30 ° with respect to the optical axis X, an optical path 2P for guiding the light incident from the light transmitting section 3 to the light receiving element 4, and emission from each of the light emitting elements 5R and 5G. Optical paths 2R and 2G for guiding the light to the light transmitting portion 3 are formed.

The apparatus main body 1 is irradiated with red light and green light sequentially from the red light emitting element 5R and the green light emitting element 5G at a predetermined time difference, and measures the reflected light intensity of each color by the light receiving element 4 to determine a predetermined value. And a calculating means 7 for performing predetermined arithmetic processing on the basis of the measurement result of the measuring means 6 to calculate the brightness and hue of the skin. A display device 8 is provided for displaying the brightness and hue of the skin in a stepwise manner based on the data calculated by.

The measuring means 6 has a calibration switch 10C, a measuring switch 10M, and the light receiving element 4 connected to the input side of the interface circuit 9, and the light emitting elements 5R, 5G connected to the output side. And a storage device 11 for storing the reflected light intensity measured by the light receiving element 4 in a predetermined storage area. When the calibration switch 10C is pressed, red light and green light are sequentially emitted from the red light emitting element 5R and the green light emitting element 5G with a predetermined time difference, and the standard reflected light intensity R of each color measured by the light receiving element 4 is obtained. ₀ and G ₀ are storage devices 11
Is stored in the standard reflected light intensity storage area 11C. Also,
When the measurement switch 10M is pressed, the red light emitting element 5R is pressed.
And the green light emitting element 5G with red light and green light are sequentially irradiated with a predetermined time difference, the color reflected light intensity R _M measured by the light receiving element 4, the reflected light intensity storage area 11M of G _M is the storage device 11 It is memorized.

The calculating means 7 calculates the normalized reflected light intensities R and G based on the standard reflected light intensities R ₀ and G ₀ stored in the storage device 11 and the color reflected light intensities R _M and G _M respectively. It is calculated by the formula. R = R _M / R ₀ , G = G _M / G ₀ Then, based on these calculation results, the skin brightness B
And the skin tone C are calculated by the following equation. B = R + G, C = RG From the above, if the brightness and color of the standard measurement target surface and the brightness and color of the skin measurement site match, then R _M = R
₀ , G _M = G ₀ , so that the normalized reflected light intensity R = 1,
G = 1, skin brightness B = 2, skin tone C = 0. Therefore, as shown in FIG. 3, when the vertical axis represents the skin brightness B and the horizontal axis represents the skin tone C, (B, C) =
(2,0) point is the origin of, B> 2, C> 0 in the first quadrant Z ₁ in bright pink healthy skin, B> 2, C <0
Second quadrant Z ₂ in bright fair skin was burnt B <2, C <0 the third quadrant Z ₃ in pathological Aojiroi skin, B> 2, C <0 In the fourth quadrant Z ₄ days It will represent brown skin.

As shown in FIG. 3, for example, the display device 8 can easily read a graph with the skin brightness B on the vertical axis and the skin tone C on the horizontal axis, so that the graph origin can be read. And nine light-emitting diodes L ₀₀ , L ₁₁ , L ₁₂ , L ₂₁ , L arranged in an X-shape in each of the quadrants Z _{1 to} Z _4.
The brightness B and the skin tone C of the skin calculated by the calculating means 7 are displayed in five stages at ₂₂ , ₃₁ , L ₃₂ , L ₄₁ and L ₄₂ . In this case, the brightness B of the skin is defined as B <−B ₁ , −B ₁
≦ B <−B ₀ , −B ₀ ≦ B <B ₀ , B ₀ ≦ B <B ₁ , B
Expressed in five stages of ₁ ≦ B, the hue C skin, C <-C _1,
−C ₁ ≦ C <−C ₀ , −C ₀ ≦ C <C ₀ , C ₀ ≦ C <C
₁ , represented by five stages of C ₁ ≦ C. The brightness B and hue C of skin, turns on the light emitting diode L ₀₀ of origin when it is in the range P ₀₀ near the origin, when in the first quadrant Z ₁ ranges P ₁₁ is a light emitting diode L ₁₁ is lit, when in the first quadrant Z ₁ ranges P ₁₂ in the light emitting diode L
₁₂ is lit, when in the second quadrant Z ₂ ranges P ₂₁ is turns on the light emitting diode L _21, the range of the second quadrant Z ₂ P
When in ₂₂ turns on the light emitting diode L _22, when in range P ₃₁ of the third quadrant Z ₃ is a light emitting diode L ₃₁
Turns on the third quadrant when in Z ₃ range P ₃₂ is turns on the light emitting diode L _32, range P ₄₁ of the fourth quadrant Z ₄
When there within to light the light emitting diode L _41, when in the fourth quadrant Z ₄ in the range P ₄₂ is adapted to light the light emitting diode L _42.

The above is one configuration example of the present invention, and its operation will be described below. First, when the main switch 12 is turned on, data stored in the storage device 11 or the like is erased. In this state, the tip of the probe 2 is pressed against the surface to be measured, using a portion (for example, the inside of the arm) where there is no stain or freckles and the color sample with the standard color as a standard measurement surface. When the calibration switch 10C is pressed, the red light emitting element 5R and the green light emitting element 5G are turned on at predetermined time intervals, and the red light and the green light are conformal to the surface to be measured through the light transmitting unit 3 at a predetermined time difference. Is irradiated. Then, when irradiating red light and green light, the standard reflected light intensity of each light reflected on the standard measurement target surface is detected by the light receiving element 4, and the standard reflected light intensity R ₀ when irradiating red light and The standard reflected light intensity G ₀ when irradiating green light is separately measured, and the standard reflected light intensity R ₀ ,
G ₀ is stored in the standard reflected light intensity storage area 11C of the storage device 11. Next, when the tip of the probe 2 is pressed against a portion where skin brightness and color are to be measured and the measurement switch 10M is pressed, the red light emitting element 5R and the green light emitting element 5G are turned on at predetermined time intervals. The red light and the green light are radiated on the surface to be measured through the light transmitting part 3 at a predetermined time difference. And when irradiating red light and green light,
The reflected light intensity of each light reflected by the measurement site detected by the light receiving element 4, the standard reflected light intensity G _M measured separately when irradiated reflected light intensity R _M and green light when irradiated with red light Te, and terminates the measurement stored standard reflected light intensity R _M of each color, the G _M standard reflected light intensity storage area 11M storage device 11.

Next, the arithmetic unit 7 stores the data in the storage device 11.
Standard reflected light intensity R of each color stored in ₀, G₀And each color anti
Light intensity R_M, G_MThe normalized reflected light intensity R, G based on
Is calculated, and based on these calculation results, the brightness of the skin
B and skin tone C are calculated. And the calculated
Display device based on skin brightness B and hue C data
8 light emitting diodes L₀₀, L₁₁, L₁₂, L_{twenty one}, L_{twenty two}, L
₃₁, L₃₂, L₄₁, L₄₂Is lit, the skin at the measurement site
Is the brightness and color of the standard measurement target surface.
Can be read as a relative quantity compared to the match
You.

[0019] For example, the light emitting diode L ₀₀ are the case where the lighting brightness and hue of the skin of the measurement site with substantially the brightness and hue of the standard measuring object plane coincide, also the first quadrant Z ₁ of the light emitting diode L ₁₁ or if the L ₁₂ is turned can be determined that in comparison with the standard object surface is healthier skin than tinged light pink, light emitting diode L ₂₁ or L ₂₂ of the second quadrant Z ₂ lights If you can determine that the brighter fair skin in comparison with the standard measuring object surface, when the light emitting diode L ₃₁ or the L ₃₂ of the third quadrant Z ₃ is turned relative to the standard object surface Te can be determined that the white skin pale less Ao Mi-tinged, brown skin when the light emitting diode L ₄₁ or the L ₄₂ in the fourth quadrant Z ₄ is lit tanned in comparison with the standard object surface Can be determined to be

From these results, for example, when the light emitting diodes L ₁₁ and L _{12 in} the first quadrant Z ₁ are turned on, the foundation of the color for suppressing brightness and redness is changed to the light emitting diodes L ₂₁ and L in the second quadrant Z _2. color foundation increasing redness less bright _{if 22} is lit, the color foundation to increase redness and preparative brightness when the light emitting diode L _21, L ₂₂ of the third quadrant Z ₃ is lit, Fourth quadrant Z ₄
When the light emitting diodes L ₄₁ and L ₄₂ are turned on, it is possible to give an index for selecting an optimal foundation according to the brightness and hue of the skin, such as selecting a foundation of a color that increases brightness and suppresses redness. it can.

[0021] Finally, again, such as the inside of the arm as the standard measurement target surface to measure the brightness and hue of the skin of the portion painted foundation on the skin, by the time the light emitting diode L ₀₀ near the origin lights If this is the case, the brightness and the hue of the two match, which means that the foundation of the optimum color can be selected.

In the above description, the case where the brightness of the skin is determined based on the sum of the normalized reflected light intensities of the red light and the green light has been described. However, the brightness of the skin is determined by the concentration of melanin. Since the normalized reflected light intensity of red light is proportional to the melanin concentration, the skin brightness B is replaced with the sum of the normalized reflected light intensity R of red light and the normalized reflected light intensity G of green light. Thus, the normalized reflected light intensity R of red light may simply be used. That is, in this case, the skin brightness B is B = R
Will be determined by Further, the display device 8 is not limited to the case where the light emitting diodes are two-dimensionally arranged, and a plurality of light emitting diodes for displaying the brightness of the skin stepwise and a plurality of light emitting diodes for displaying the skin tone stepwise. May be arranged in two rows.

[0023]

As described above, according to the present invention, the red light emitting element and the green light emitting element are arranged in one probe, and the red light and the green light are transmitted through the light transmitting portion to the measurement site of the skin. , So that the reflected light intensity can be measured individually with one light receiving element, the structure can be simplified, and the whole device can be reduced in size and weight.
Furthermore, if the probe is integrally attached to the hand-held device main body, the measuring means and the arithmetic means are arranged in the device main body, and the display means is arranged on the surface of the device main body to form an all-in-one type, the beauty of a woman can be improved. There is an effect that the member can be reduced in size and weight so that the member can easily carry it in a handbag or the like.

Each color light emitted from the red light emitting element and the green light emitting element is radiated at an equal angle with respect to the optical axis of the light receiving element, and the reflected light intensity of each color light radiated to the same part is equal to the reflection condition. The measurement can be performed under the following conditions, so that there is no measurement error caused by the different measurement conditions, and the reflected light intensity of each color reflected on the measurement site is compared with the standard light of each color reflected on the standard measurement target surface. Since it is normalized by the reflected light intensity, there is no measurement error caused by the difference in the irradiation light intensity of each light emitting element, and by measuring only the reflected light intensity, the brightness and hue of the skin can be accurately determined. There is an effect that measurement can be performed.

Furthermore, in this case, if a clean part of one's own skin is used as a standard measurement target surface, the difference in relative brightness and hue between that part and a part such as a face whose skin color is to be applied in a foundation. Can be objectively measured, and therefore, by referring to the measurement result, it is possible to easily select a foundation of an optimal color for natural skin color makeup, and further, the selected foundation is wetted. This provides a very excellent effect that it is possible to extremely easily check whether or not the brightness and the color of the skin match the brightness and the color of the clean part of the user's skin which is the standard measurement target surface.

[Brief description of the drawings]

FIG. 1 is a skin brightness and color measurement device according to the present invention.

FIG. 2 is a block diagram thereof.

FIG. 3 is a graph showing the relationship between skin brightness and hue.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Device main body 2 ... Probe 2P, 2G, 2R ... Optical path 3 ... Translucent part X ... Optical axis 4 ... Light receiving element 5R ... Red light emitting element 5G ... Green light emission element 6 ... measuring means 7 ... calculating means 8 ... display R ₀ · · red standard reflected light of the standard reflection light intensity G ₀ · · green light intensity R _M · · red light of the reflected light Intensity G _M・ ・ Reflected light intensity of green light R ・ ・ ・ Normalized reflected light intensity of red light G ・ ・ ・ Normalized reflected light intensity of green light B ・ ・ ・ Brightness of skin C ・ ・ ・ Tone of skin

Claims (3)

[Claims] 1. A probe (2) having a light-transmitting portion (3) formed at the tip thereof to be in contact with a measurement site on the skin, wherein the probe (2) has its tip at the measurement site on the skin. An optical path (2P) for guiding incident light from the light transmitting portion (3) to the light receiving element (4) on the optical axis (X) passing through the light transmitting portion (3) and orthogonal to the skin surface in a contact state. When the red light and the green light emitted from the red light emitting element (5R) and the green light emitting element (5G) are irradiated on the measurement site through the light transmitting part (3), the respective color lights are emitted by the light. An optical path (2R, 2G) for irradiating at an angle to the axis (X) is formed, and a red light and a green light are sequentially emitted from the light emitting elements (5R, 5G) at a predetermined time difference to a standard measurement target surface. each color standard reflected light intensity when the skin (R _0, G ₀₎ of said light receiving element (4) at each measured and stored, to be measured Wherein the measurement site the light-emitting elements (5R, 5G) colors the reflected light intensity when the sequentially irradiated red light and green light at a predetermined time difference from (R _M, G M) measuring means for storing the respective measured and (6 ) And the reflected light intensity of each color (R _M, G _M ) is converted to the standard reflected light intensity of each color (R ₀ , G ₀ )
Calculating means (7) for calculating the sum and difference of the normalized reflected light intensities (R, G) of each color after calculating the normalized reflected light intensities (R, G) of each color by: Display means (8) for displaying the skin brightness (B) and color tone (C) represented by the sum and difference of the light intensities (R, G) in a stepwise manner. And color measurement device. 2. A probe (2) having a light-transmitting portion (3) formed at the tip thereof in contact with a measurement site on the skin, wherein the probe (2) has its tip at the measurement site on the skin. An optical path (2P) for guiding incident light from the light transmitting portion (3) to the light receiving element (4) on the optical axis (X) passing through the light transmitting portion (3) and orthogonal to the skin surface in a contact state. When the red light and the green light emitted from the red light emitting element (5R) and the green light emitting element (5G) are irradiated on the measurement site through the light transmitting part (3), the respective color lights are emitted by the light. An optical path (2R, 2G) for irradiating at an angle to the axis (X) is formed, and a red light and a green light are sequentially emitted from the light emitting elements (5R, 5G) at a predetermined time difference to a standard measurement target surface. each color standard reflected light intensity when the (R _0, G ₀₎ after storing each measured and in the light receiving element (4), to be measured Wherein each light emitting element to the measurement site of the peel (5R, 5G) colors the reflected light intensity when the sequentially irradiated from the red light and green light with a predetermined time difference (R _M, G M)
Measuring means (6) for measuring and storing the respective reflected light intensities (R _M, G _M ) of the respective colors and the standard reflected light intensities (R ₀ ,
After calculating the normalized reflected light intensity (R, G) of each color by normalizing with G ₀ ), an arithmetic unit (7) for calculating the difference between the normalized reflected light intensity (R, G) of each color; Reflected light intensity (R)
And a display means (8) for displaying the brightness (B) and the color tone (C) of the skin represented by the difference in the normalized reflected light intensities (R, G) of each color in a stepwise manner. A device for measuring skin brightness and color tone. 3. The probe (2) is integrally attached to a handy type device main body (1), and a measuring means (6) and a calculating means (7) are provided in the device main body (1).
The skin brightness and color tone measuring device according to claim 1 or 2, wherein a display means (8) is provided on a surface of the device main body (1).