JP2002345760A - Spectral reflectance measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an inexpensive and small-sized spectral reflectance measuring device equipped with camera and illumination means simplified in device structure and easy to maintain. SOLUTION: This spectral reflectance measuring device substantially comprises an optical system formed of the illumination means 22 and an imaging means 24, and an output means for outputting image information processed on the basis of an image signal. The illumination means 22 and the imaging means 24 are housed in a casing 36 in an arrangement state deflected at a right angle through a reflector 34. The illumination means 22 is lighted in time division by use of three kinds of blue, green and red light emitting diodes 28a-28a as light source. A diffusion plate 30a and a diffusion shade 30b are provided on the front surface of each diode 28a-28c. A cap equipped with a spectral reflectance calibration board is mounted on the tip part of the illumination means 22. The imaging means 24 comprises an imaging lens 44 and a monochromic CCD camera 46.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spectral reflectance measuring apparatus, and more particularly, to the distribution of pigmentation on the surface of a living skin and inside the skin, and the pores, transparency, dullness, and makeup skin color on the surface of the living skin. The present invention relates to an apparatus for obtaining a spectral image for performing

[0002]

2. Description of the Related Art In order to obtain a desired finish by makeup, it is first necessary to know the surface condition of bare skin as a base.

[0003] In this case, it is important to obtain information on skin color, in addition to skin texture and moisture.

[0004] As means for collecting information on the skin color, for example, a spectral reflectance of the surface of the living skin is measured using a spectrophotometer, and the tristimulus values X, X, There is known a method in which Y and Z are calculated and converted into a developed color, for example, Munsell's H, V, C, etc., to obtain a skin color.

However, in the measurement method using the above-mentioned spectrophotometer, since the obtained spectral reflectance is a spectral reflectance as an average value within a predetermined target area, uneven reflectance caused by pigmentation, floating of blood vessels, etc. It is difficult to analyze the local color of the surface of a natural living skin.

[0006] On the other hand, a method of capturing the surface of a living skin as a color image using a color CCD camera is also known.

However, in the measurement method using the above-mentioned color CCD camera, the obtained image information is 3 pixels per pixel.
Since the stimulus values are R, G, B or X, Y, Z and do not obtain spectral reflectance, they are not necessarily sufficient as data for performing analysis focusing on the spectrum of the non-uniform biological skin surface color. .

[0008] The present applicant has solved the above problems, and furthermore, has information on whether melanin forming pigmentation is relatively shallow or deep in the body skin surface. The present inventors have conducted intensive studies on a measuring method and an apparatus capable of obtaining information on dullness and transparency of skin.

As a result, for example, when the location of melanin is different in the depth direction from the surface of the living skin, melanin which forms pigmentation in a relatively shallow region is shown in an ultraviolet photograph and forms melanin in a relatively deep region. Method and apparatus for estimating relative depth from the skin surface where melanin is present from a combination of spectral images by wavelength, based on the knowledge that melanin is imaged separately in infrared photography (J. Soc. Cosmet.
Chem. Japan. Vol. 32, No. 4,361-371,
1998, JP-A-7-198939).

[0010] The above-described apparatus is composed of an optical system shown in FIG.
The system includes an optical system shown in FIG.

The optical system employs a trispectral camera 1 that can simultaneously capture spectral images of three wavelengths. The trispectral camera 1 integrates a quartz glass ring strobe (not shown) capable of preventing shading and securing irradiation light in the ultraviolet region, and a three-plate CCD camera 2 shown in FIG. It was done.

The three-plate CCD camera 2 has prisms 4a to 4c and dichroic mirrors 7b and 7c arranged on the front surfaces of three CCD elements 3a to 3c, respectively.
400 nm between a.about.4c and CCD elements 3a.about.3c,
Bandpass filters 5a to 5c having main wavelengths of 550 nm and 700 nm are provided. A color correction filter 6 is provided in front of the prism 4a, and a fisheye lens 7 having flat light transmission characteristics in the target wavelength region and allowing close-up photography is disposed in front of the color correction filter 6.

As shown in FIG. 9, a system configuration of the entire apparatus including the optical system includes a spectral image photographing section 8 including a trispectral camera 1, a strobe controller 8a, and a luminance controller 8b for each wavelength. Image memory unit 9 for temporarily storing an image after image processing
a, an image analysis unit 9b for analyzing a captured spectral image, an image output unit 10 including a video printer 10a and a monitor 10b for outputting a captured spectral image and an image analysis result, and a magneto-optical device for storing a captured spectral image and a processing result Disc 1
The system comprises an external storage device 11 having a memory 1a and a system control unit 12 using a personal computer 12a for controlling the entire system.

When the photographing switch of the camera 1 is depressed and the spectral image is photographed, the spectral image data of the main wavelengths of 400 nm, 550 nm and 700 nm, which are digitized into 8 bits, are transferred to the image memory unit 9a and thereafter collected in advance. Spectral reflectance calibration plate (Evercolor, No. 100)
0, No. 3000, No. 6000, manufactured by Yoneda Glass Industrial Co., Ltd.), the spectral reflectance of each pixel is calibrated using the luminance and spectral reflectance data, and image analysis is performed using the built-in analysis software, and the results are monitored. An image is displayed on 10b.

[0015] Thus, from three display images obtained based on the spectral image data of the three main wavelengths, it is possible to estimate the relative depth of the place where melanin exists as viewed from the surface of the living skin.

Specifically, in the case of freckles, the main wavelength is 40
It is mainly imaged with a spectral image of 0 nm, in the case of Mongolian spots, it is mainly imaged with a spectral image of a main wavelength of 700 nm, and in the case of a mole, it is imaged with any of a spectral image of a main wavelength of 400 nm and 700 nm. It was confirmed that it would be. From this, it is presumed that melanin forming freckles exists at a relatively shallow place and melanin forming Mongolian spots exists at a relatively deep place. In addition, it can be said that melanin forming a mole exists in a shallow place and a deep place.

[0017]

According to the above-described measuring method and apparatus developed by the present applicant, useful information such as the three-dimensional distribution of melanin on the surface of the living skin and inside the skin can be obtained.

However, the above-mentioned device is composed of various optical elements and devices as described in detail, and is not only expensive but also difficult to miniaturize. This is an obstacle in terms of cost and installation area when trying to provide consumer services by placing this device at stores nationwide that sell cosmetics, as well as handling and maintaining the camera during measurement. Causes a trouble that becomes complicated.

Further, the above-mentioned apparatus can present information on the surface of the living skin and the state of pigmentation distribution inside the skin, but information required for obtaining a desired finish by makeup, that is, pores on the surface of the living skin The provision of information such as transparency, dullness, and makeup skin color is not considered.

The present invention has been made to further improve the above-described apparatus developed by the present applicant, and has a camera and an irradiating means which are simple in configuration, easy to maintain, inexpensive and miniaturized. It is an object of the present invention to provide a spectral reflectance measuring device provided with:

[0021]

The spectral reflectance measuring apparatus according to the present invention comprises: an irradiating means for setting a plurality of predetermined wavelengths as main wavelengths and irradiating light of the plurality of main wavelengths to the surface of a living skin in a time-division manner; Spectral reflectance comprising: imaging means for receiving and imaging the reflected lights of the plurality of main wavelengths from the surface of the living skin; and output means for outputting image information processed based on the image signals of the plurality of main wavelengths. A measurement device, wherein the irradiation unit has a light source corresponding to the plurality of wavelengths, the imaging unit is a monochrome camera, and the light source and the monochrome camera are provided inside one housing; The apparatus further includes spectral reflectance calculating means for obtaining image information for each pixel for a number of wavelengths exceeding the plurality of wavelengths based on image signals of a plurality of main wavelengths, wherein the spectral reflectance calculating means is provided outside the housing. It is characterized by being obtained.

In this case, preferably, the predetermined plurality of wavelengths are predetermined three wavelengths in a visible region, the light sources are three kinds of light emitting diodes corresponding to the three wavelengths, and the monochrome camera is In the CCD solid-state imaging device, the number of wavelengths exceeding the plurality of wavelengths is four or more.

Here, the predetermined three wavelengths in the visible region and the predetermined four or more wavelengths can be arbitrarily set as appropriate from the respective wavelengths in the visible region.

Thus, useful information, such as accurately grasping the three-dimensional distribution of melanin inside the living skin, can be obtained based on the obtained spectral images of many wavelengths.

Further, the irradiating means is not a strobe light but a light emitting diode, and the imaging means is a fisheye lens allowing close-up photography, a color correction filter, three prisms, two dichroic mirrors, and three elements corresponding to three main wavelengths. By using a monochrome CCD camera instead of a three-plate color CCD camera with a band-pass filter, a spectral reflectance measuring device that is simple in configuration, easy to maintain, inexpensive, and small in size and has good operability is provided. Obtainable.

Further, in the spectral reflectance measuring apparatus according to the present invention, the output means may include a color image obtained by synthesizing a macro image including a measurement site on the biological skin surface based on the received image signal and the biological skin surface image information. If the display unit for switching and displaying an image is arranged outside the housing, it is possible to perform measurement while confirming the position of a micro-measurement point by seeing a macro image by monochrome display, for example, Color display screen, skin color and transparency,
It is preferable because the degree of dullness, the degree of pigmentation, and the like, and the makeup skin color after applying the makeup material can be visually recognized. At this time, if further provided with a graph display unit that graphically displays the spectral reflectance curve of the designated pixel,
More useful information can be obtained visually.

[0027]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of a spectral reflectance measuring apparatus according to the present invention (hereinafter, referred to as an embodiment).
Will be described below with reference to the drawings.

The spectral reflectance measuring apparatus according to the present embodiment will be described with reference to the optical system shown in FIGS. 1, 2 and 3 and the system configuration shown in FIG.

The spectral reflectance measuring device 20 includes an irradiation unit 22
And an optical system comprising an image pickup means 24 and an output means 26 for outputting image information processed based on the image signal.

The irradiation means 22 and the imaging means 24 are accommodated in a single housing 36 in an arrangement bent at a right angle. A push button switch 38 is provided on a portion of the housing 36 that houses the imaging unit 24.

The irradiating means 22 is a blue LED (model number NSPB320BS) having a main wavelength of 470 nm (half-width: 20 nm).
28a, green LED (model number NSPG320BS) having a main wavelength of 525 nm (half width: 33 nm)
Nichia) 28b and a red LED (Model No. SLA-360J) having a main wavelength of 660 nm (half-width: 20 nm).
T Rohm) 28c three types of light emitting diodes (hereinafter, referred to as
The words are referenced 28a-28c. ) As the light source. However, the light source is not limited to the light emitting diode, and the wavelength used is not limited to the wavelength in the visible range, nor is the wavelength limited to three wavelengths. Furthermore, the dominant wavelength and half width of the light emitting diode are not limited to those described above.

The three types of light emitting diodes 28a to 28c are:
As shown in FIG. 2, the three light emitting diodes 28a to 28
Assuming that c is one group, a total of 24 groups of 8 groups are arranged in a ring shape on the holding cylinder 42, and a surface light source is formed without limit. Holding tube 4
The second material is a polyacetal resin (POS: Delrin), which electrically insulates adjacent light emitting diodes. However, the number, arrangement order, and the like of the light emitting diodes to be arranged are not limited thereto.

An annular diffusion plate 30a and a diffusion shade 30b are provided on the front surface of each of the light emitting diodes 28a to 28c.
Further, a white paint (titanium oxide) that diffuses light is applied to the inner wall 30c of the housing 36 in which the diffusion plate 30a and the diffusion shade 30b are arranged. To prevent dust from entering and adhering into the optical path, a cover glass (model number SK-32
3 Sugito) 32 is arranged near the tip of the probe.

A circular opening 40 having a diameter of 30 mm is provided at the left end in FIG.
Are formed. Open the spectral reflectance calibration plate 60 to the opening 40
A cap 70 having a function of a lid attached to the side comes into close contact with the opening 40 via a contact ring 80. The dimensions of the opening 40 are such that the surface dimension of the skin as a living skin surface is 20 mm × 20 mm square, which is the irradiation range of the subject.

In order to bring the cap 70 into close contact with the opening 40 with good geometric reproducibility and close contact, the pin 70a of the cap 70 is inserted into the pin hole 80a of the contact ring 80, and the female screw 72a of the tightening ring 72 is inserted. The contact ring 80 is tightened while being fitted to the male screw 82a.

A concave top and bottom mark 74 is carved on the cap 70 so that the position of the pin 70a can be seen from the outside, to facilitate positioning.

The spectral reflectance calibration plate 60 has three spectral reflectances of black, gray, and white in the visible range of about 10%, 30%, and 60%.
A piece of baked acrylic coated plate (each adherend is an aluminum plate having a thickness of 0.5 mm and a length and width of 18 mm × 9 mm) is attached to the cap 70 so as to be adjacent to the opening 40 side (FIG. Not shown.) However, the spectral reflectance, paint, coating method, size, shape, adherend, and the like constituting each calibration plate are not limited thereto.

The housing 36 has a reflecting mirror (model number TS-0832R manufactured by Sugito) 34 interposed in the middle of the optical system in consideration of operability, and refracts the optical path by 90 °.

The imaging means 24 has an imaging lens (made by Medes Glio) 44 and a monochrome CCD camera (made by Toshiba) 46 as a light receiving element. However, the light receiving element is C
The invention is not limited to the CD-type solid-state imaging device.

The above-mentioned irradiation means 22 and imaging means 24
The housing 36 in which the outer dimensions are, for example, as shown in FIG.
Dimension L1 is 62 mm, dimension L2 is 170 mm, dimension L3
Is about 50 mm, which is downsized. Their total mass is light, for example, about 350 g. Therefore, the handling of the device is excellent.

In the case of the apparatus shown in FIGS. 8 and 9 with respect to the above external dimensions, three bandpass filters, three prisms, two dichroic mirrors, Since it has a single color correction filter and has a strobe and a fisheye lens, its outer dimensions are, for example, 12
The size is as large as about 0 mm × 100 mm × 240 mm, and their total weight is as heavy as about 2000 g. Further, the cost of these conventional devices is expensive, for example, about several tens to one hundred times that of the above-described embodiment.

Therefore, the spectral reflectance measuring apparatus of the present invention, which has a simple configuration, is easy to maintain, is inexpensive, is small, and has good operability, is arranged, for example, at stores nationwide where cosmetics are sold. Thereby, useful information can be obtained and the consumer service can be effectively implemented.

The housing 36 is connected to an output means 26 described below by a cable (not shown).
Connected to a power supply not shown.

The output means 26 is connected to the LED controller 5
0, a personal computer (personal computer) 52, a video printer 54, and a monitor (display unit) 56. Note that an external storage device such as a conventional example may be connected to the personal computer 52 as needed.

The operation of the spectral reflectance measuring device 20 according to the present embodiment configured as described above will be described.

When measuring the skin color or the like of a predetermined site on the cheek as a living skin surface, for example, the LED controller 50 is used.
Is turned on, the push button switch 38 is pressed to turn on the light emitting diode 28b, and the opening 40 of the housing 36 is opened.
Abut on the skin. Then, the measurement site is determined while checking on the monitor 56, and the push button switch 38 is pressed again to light up the light emitting diodes 28a to 28c in a time-division manner.

At this time, the light emitting diodes 28a to 28c
The light of each wavelength emitted from the diffusion plate 30a and the diffusion shade 3
0b, the light is diffused and reflected on the inner wall 30c, so that the light is irradiated as uniform light onto the imaging target in a so-called planar light source state.
The surface of the living skin is illuminated without shadow.

Irradiation light of a specific wavelength which is time-divided, for example,
The blue light of the light emitting diode 28a is reflected on the skin surface of the living body, and the reflected light reaches the reflecting mirror 34. The reflected light has its optical path changed by 90 ° by the reflecting mirror 34, passes through the imaging lens 44, and reaches the monochrome CCD camera 46.

The reflected light is received by a large number of photodiodes of the monochrome CCD camera 46. The luminance signal related to the reflected light at the specific wavelength for each pixel corresponding to the photodiode is a PCI (Peripheral Component Int.)
erconnect) The data is transferred to the memory of the personal computer 52 via the bus in 8 bits and recorded.

The reflecting mirror 3 incorporated in the imaging means 24
The image inverted right and left in step 4 is converted into a mirror image by image processing, and then the brightness of each pixel is calibrated using a separately obtained look-up table for calibrating brightness. Further, the luminance and spectral reflectance data of the spectral reflectance calibration plate previously collected (data of the black and gray spectral reflectance calibration plates for wavelengths of 470 nm and 525 nm, and data of the spectral reflectance calibration plates for wavelength of 660 nm) Using the data of the black and white spectral reflectance calibration plates), the obtained luminance is converted into the spectral reflectance. In the above-described spectral reflectance measuring apparatus of the present invention, it is preferable to use a pentaprism instead of the reflecting mirror 34, since it is not necessary to convert a reversed image into a mirror image by image processing.

In order to obtain the spectral reflectance of each pixel of the captured image, the following method is also preferable. The description will be made using a 470 nm spectral image as an example.

The output voltages of the CCDs obtained when the black and gray spectral reflectance calibration plates are illuminated by the light emitting diodes 28a are measured, and a regression equation for obtaining the spectral reflectance from the output voltage value is created. Using this regression equation, the spectral reflectance of the pixel is calculated from the output voltage value for each pixel.

In order to obtain the luminance of each pixel of the captured image, the following method is also preferable. The description will be made using a 470 nm spectral image as an example.

The output voltages of the CCDs obtained when the black and gray spectral reflectance calibration plates are illuminated with the light emitting diodes 28a are measured, and then, an arbitrary luminance is assigned to each of the black and gray output voltages. Create a regression equation to find the luminance from the value of. Using this regression equation, the luminance of the pixel is calculated from the output voltage value for each pixel.

Using the converted spectral reflectance, an operation for obtaining spectral reflectance data for each pixel corresponding to a predetermined wavelength point, for example, an arbitrary wavelength point in the visible region of 400 to 700 nm is performed ( Spectral reflectance calculating means) inversely converts the obtained spectral reflectance into luminance to create a spectral image. It is possible to calculate and display the melanin distribution state in the depth direction below the skin surface from this spectral image. The calculation result is sent to the video printer 54 and the monitor 56 to be output and displayed.

If the monitor 56 is designed to display the spectral reflectance (described later) in a graph by designating the pixels obtained by the above arithmetic processing, it is suitable for understanding the spectral spectral characteristics.

Here, a method for obtaining the above-described spectral reflectance data, an image display method based on the result, and a method for evaluating the obtained data will be described in detail below.

The spectral reflectance at each arbitrary wavelength point can be obtained by applying one principal component analysis method of the statistical multivariate analysis method based on the data of the spectral reflectance at the three wavelength points. it can.

The details of this are as described in the Japan Cosmetic Engineers Association Research Symposium (SCCJ Research Symposium 46th Lecture Abstracts, 63-66 2000), and will be briefly described here. I do.

The spectral reflectance obtained when irradiating the skin with light has three constituent factors V _{1 to} V ₃ . Therefore, the spectral reflectance R _lambda any wavelength points may be represented in the form of equation (1).

[0061] _{R λ = M 1 V 1,} λ + M 2 V 2, λ + M 3 V 3, λ (1) where, _{M i} is a weighting factor related to the structure factor _{V i, M i V i,} λ is the magnitude of the constitutive factor V _i at wavelength lambda.

Using the above equation (1), the wavelength 470n
m, the spectral reflectance of each pixel obtained by irradiating light of wavelength 525 nm and wavelength 660 nm is R ₄₇₀ ,
_Assuming that R _{52 5} and R ₆₆₀ , the following equation (2) can be written.

[0063] _{R 470 = M 1 V 1,470 +} M 2 V 2,470 + M 3 V 3,470 R 525 = M 1 V 1,525 + M 2 V 2,525 + M 3 V 3,525 (2) R 660 = M ₁ V _1,660 + M ₂ V _2,660 + M ₃ V _3,660 The simultaneous equations of the above equation (2) are solved, and M ₁ , M ₂ , and M ₃ for each pixel are calculated. By substituting it into 1), the spectral reflectance of each pixel at an arbitrary wavelength in the visible region can be obtained, and a spectral image can be obtained by performing inverse conversion to luminance. FIG. 5 illustrates the calculation process.

By laminating the binary images of the spectral images of the respective wavelengths, for example, as shown in FIG. 6, the distribution state of melanin in the skin can be three-dimensionally visualized. As a method of stereoscopically visualizing the spectral image, visualization by volume rendering is also preferable.

Further, as shown in FIG. 7, it is also possible to know, for example, a change with time of melanin which forms a sunburn. 7 is a color image of the skin surface of the living body, a middle figure is a three-dimensional image of melanin forming pigmentation, and a right figure is a 10 nm interval covering the visible region.
This is a histogram display of the number of black pixels corresponding to melanin extracted by binarizing a spectral image at 31 wavelength points.

By the way, the present applicant has already made a number of proposals regarding the above-mentioned method of visualizing melanin which forms pigmentation on the skin surface layer, pores, transparency, dullness, and makeup skin color on the surface of a living skin. .

For example, in Japanese Patent Application Laid-Open No. 7-12544, an image signal suitable for evaluating the state of spots, freckles and pores is output by analyzing the image obtained by imaging the surface of the skin. Regarding the imaging device,
A device capable of obtaining an image without ding (shadowless) has been proposed.

Further, Japanese Unexamined Patent Publication No.
In 198939, by using a trispectral camera to simultaneously capture images of three wavelengths,
We propose a surface condition analysis system that can measure the depth and distribution of melanin granules that form freckles, and the distribution of their color density.

In Japanese Patent Application Laid-Open No. 7-55447,
After smoothing the image of the surface of the skin, subtracting the image before smoothing, performing log conversion, inverting the brightness, performing automatic binarization, and calculating the total number of pixels in the dark area. We propose an analysis system for skin surface condition, which is used as an index to represent the condition of pores.

The applicant of the present invention is a Japanese cosmetics engineer's journal (JS
oc. Cosmet. Chem. Japan. Vol. 31, No. 1,44
-51 1997), a method for measuring the dullness of the skin is reported. is suggesting.

Y = −0.016M ₁ −0.127M ₃ +6.61 (3) Alternatively, the degree of dullness Y ′ (+2 to −2, with or without dullness corresponding to a 5-level luminous evaluation value) The following equation (4) may be used as the equation to be obtained.

Y ′ = 0.016 M ₁ +0.127 M ₃ −3.61 (4) By substituting M ₁ and M ₃ obtained by the above equation (2) into the equation (3) or the equation (4) , The degree of dullness Y or the degree of dullness Y 'can be determined.

Further, the applicant of the present invention has a Japanese Society of Cosmetic Engineers Research Discussion Meeting (SCCJ Research Discussion Meeting 10th Lecture Abstracts).
15-17 1981) proposes the following equation (5) as an equation for determining the transparency of the skin.

T = 0.089M ₂ (5) Also in this case, by substituting M ₂ for each pixel obtained by Expression (2) into Expression (5), the transparency T (+2 to
-2, with or without transparency) (corresponding to a 5-level luminous evaluation value).

By substituting Y ′ and T for each pixel obtained by the above equations (4) and (5) into the following equations (6) and (7), luminance I _{Y ′} and luminance I _T ( 0-255) and display an image. As a result, the degree of dullness and transparency can be visualized. In displaying an image, it is preferable to perform pseudo color display.

I _{Y ′} = 255 (Y ′ + 2) / 4 (6) I _T = 255 (T + 2) / 4 (7) That is, these are not only the same as the degree of skin pigmentation but also
The purpose of the present invention is to realize the image display and quantification of the state of pores, that is, the so-called skin transparency, and the realization of the image display and quantification of dull skin.

Further, the present applicant has disclosed in Japanese Patent Application Laid-Open No. 55-1480.
No. 45, based on Kubelka-Munk's theory,
A method has been proposed for estimating the spectral reflectance of makeup flesh color by thin or thick coating without actually applying the makeup material to the skin. Here, only the outline will be described.

The spectral reflectance R of the make-up skin color is calculated by the following equation (8).
Can be calculated by using

R = {1-R _g (a-bctghbSX)} / {a-R _g + bctghbSX)} (8) where R _g is the spectral reflectance of the bare skin, and X is the thickness of the applied makeup material. Where S, a, and b are the optical characteristics of the coating film of the makeup material.

[0080] Spectral and reflectance R _g of skin for each pixel of the skin surface image obtained by the spectral reflectance measuring device according to the present invention,
By substituting the optical characteristics S, a, b of the makeup material and the thickness X of the makeup material to be applied in Equation (8), the spectral reflectance of each pixel of the makeup skin color can be estimated.

Tristimulus values X, Y and Z are obtained from the obtained spectral reflectance of each pixel of the makeup skin color. X, Y, Z obtained
Is converted into, for example, R, G, B of the NTSC system, and further converted into luminance, so that an image of the makeup skin color can be displayed.

By taking the above procedure, it is possible to visually confirm the make-up skin color when lightly or thickly applied without actually applying makeup.

[0083]

According to the spectral reflectance measuring apparatus of the present invention, an irradiating means for irradiating light of a plurality of main wavelengths to a living skin surface in a time-division manner with a plurality of predetermined wavelengths as main wavelengths, An image pickup unit that receives and reflects reflected light of a plurality of main wavelengths from an imaging unit, and an output unit that outputs image information processed based on the image signals of the plurality of main wavelengths, and a spectral reflectance measurement device, The irradiating means has a light source corresponding to a plurality of wavelengths, the imaging means is a monochrome camera, and the light source and the monochrome camera are provided inside one housing, and the plurality of wavelengths are determined based on image signals of a plurality of main wavelengths. Further comprising spectral reflectance calculating means for obtaining image information for each pixel for a number of wavelengths exceeding the number of wavelengths. Since the spectral reflectance calculating means is provided outside the housing, the spectral reflectance calculating means is based on spectral images of many wavelengths obtained. For example, skin Three-dimensional distribution and the like of melanin in part can obtain useful information such as to accurately grasp the. Further, it is possible to obtain a spectral reflectance measuring apparatus which has a simple apparatus configuration, is easy to maintain, and has an inexpensive and miniaturized camera and an irradiation unit.

Further, according to the spectral reflectance measuring apparatus of the present invention, since the display section capable of switching and displaying the macro image and the color image as the output means is disposed outside the housing, the macro image can be viewed. This makes it possible to measure while confirming the position of the micro-measurement points, and the color display screen shows the skin color, transparency, dullness, pigmentation degree, etc., and also the makeup after applying makeup. Skin color and the like can be visually recognized.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an optical system of a spectral reflectance measuring device according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a diagram for explaining a cap, a spectral reflectance calibration plate, and an opening of an optical system of the spectral reflectance measuring device according to the embodiment.

FIG. 4 is a system configuration diagram of the spectral reflectance measuring device according to the present embodiment.

FIG. 5 is a diagram for explaining a spectral reflectance curve for each pixel and a spectral image at an arbitrary wavelength in a visible region obtained by the spectral reflectance measuring device according to the present embodiment.

FIG. 6 is a view for explaining a state in which the distribution state of melanin in the skin is three-dimensionally visualized.

FIG. 7 is a diagram for explaining the change over time of melanin forming sunburn.

FIG. 8 is a schematic configuration diagram of an optical system of a spectral reflectance measuring device developed earlier by the present applicant.

FIG. 9 is a system configuration diagram of a spectral reflectance measuring device developed earlier by the present applicant.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 20 Spectral reflectance measuring device 22 Irradiation means 24 Imaging means 26 Output means 28a Blue LED 28b Green LED 28c Red LED 30a Diffusion plate 30b Diffusion shade 30c Inner wall 32 Cover glass 34 Reflector 36 Housing 38 Push button switch 40 Opening 42 Holding Tube 44 Imaging lens 46 Monochrome CCD camera 50 LED controller 52 Personal computer 54 Video printer 56 Monitor 60 Spectral reflectance calibration plate 70 Cap 70a Pin 72 Tightening ring 72a Female thread 74 Top and bottom mark 80 Contact ring 80a Pin hole 82a Male screw

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yukiko Himuro 3-9-1, Nishigotanda, Shinagawa-ku, Tokyo Inside Shiseido Beauty Science Laboratory (72) Inventor Masao Yamamoto 3-28 Yoyogi, Shibuya-ku, Tokyo No. 6 F-term in Scala Corporation (reference) 2G020 AA08 CC13 CC28 CC63 CD12 CD24 DA05 DA12 DA66 2G059 AA05 BB20 EE02 EE11 FF01 GG02 GG03 GG09 HH02 KK04 MM01

Claims (3)

[Claims] An irradiation means for irradiating a plurality of predetermined wavelengths to the main wavelength, irradiating the plurality of main wavelengths to the surface of the living skin in a time-sharing manner, and reflecting reflected light of the plurality of main wavelengths from the living skin surface An imaging unit for receiving and imaging an image, and a spectral reflectance measurement device including an output unit for outputting image information processed based on the image signals of the plurality of main wavelengths. A corresponding light source, wherein the imaging means is a monochrome camera, wherein the light source and the monochrome camera are provided in one housing, and the plurality of wavelengths are exceeded based on the image signals of the plurality of main wavelengths. An apparatus for measuring spectral reflectance, further comprising spectral reflectance calculating means for obtaining image information for each pixel for several wavelengths, wherein the spectral reflectance calculating means is provided outside the housing. 2. The method according to claim 1, wherein the plurality of predetermined wavelengths are three predetermined wavelengths in a visible region, the light source is three kinds of light emitting diodes corresponding to the three wavelengths, and the monochrome camera is a CCD solid-state imaging device. The spectral reflectance measuring apparatus according to claim 1, wherein the number of wavelengths exceeding the plurality of wavelengths is four or more wavelengths. 3. The display device according to claim 1, wherein the output unit is configured to switch and display a macro image including a measurement site on the biological skin surface based on the received image signal and a color image obtained by synthesizing the biological skin surface image information. 3. The spectral reflectance measuring device according to claim 1, wherein the spectral reflectance measuring device is arranged outside a body.