JP3934253B2 - Skin color classification system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a skin color classification system, and more particularly to a skin color classification system that measures the color of human skin and recognizes the skin color based on the measurement result.
[0002]
[Prior art]
When performing makeup counseling, it is necessary to accurately recognize the skin color in order to select the color of the lipstick and other cosmetics according to the skin color of the person.
Traditionally, there is no system for measuring and mechanically classifying the skin color of a person's face, and when the counselor looks at the subject's face, the skin color is white or black, reddish or yellow It was classified empirically whether it was bright.
[0003]
[Problems to be solved by the invention]
However, since the counselor has traditionally classified the skin color of the subject's face by looking at the subject's face, the skin color classification result may differ depending on the individual counselor's individuality, There was a problem of low accuracy.
The present invention has been made in view of the above points, and an object of the present invention is to provide a skin color classification system that can objectively and accurately classify the skin color of a subject's face.
[0004]
[Means for Solving the Problems]
The invention according to claim 1 is an analysis means for irradiating a subject's skin that is spaced apart with halogen light, receiving light from the skin and performing spectral analysis to obtain a spectral radiance;
Spectral for calculating the spectral reflectance of the skin using the spectral radiance obtained by the analyzing means, the standard spectral reflectance of the white calibration plate, and the spectral radiance of the white calibration plate measured in advance by the spectral means. Reflectance calculation means;
Color information conversion means for converting the spectral reflectance of the skin into skin color information;
Classification means for classifying a subject's skin color by comparing the skin color information with an existing skin color classification map.
[0005]
In this way, the halogen light is irradiated to the skin of the subject who is separated, the light from the skin is received and spectral analysis is performed, the spectral reflectance obtained as a reference of the white calibration plate, and the spectral means previously measured. In order to classify the skin color of the subject by calculating the spectral reflectance of the skin using the spectral radiance of the white calibration plate that is further converted into skin color information and compared with the existing skin color classification map, The skin color information of the subject can be accurately measured in a non-contact manner, and the skin color information can be compared with the skin color classification map to objectively and accurately classify the skin color of the subject.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a block diagram of an embodiment of a makeup counseling system including the skin color classification system of the present invention. In FIG. 1, the makeup counseling system is roughly constituted by a photographing / skin measuring unit 10, a personal computer (personal computer) 14 of a main unit 12, a CRT monitor 16, and a printer 18.
[0007]
A half mirror 22 is provided on the entire front surface of the photographing / skin measuring unit 10, and a reference line 23 is written at the upper center corner of the half mirror 22 as a mark for indicating the photographing center. A transparent glass 24 is provided at the upper right corner of the half mirror 22. The photographing / skin measuring unit 10 is disposed at a predetermined distance (for example, 6 m) away from the chair on which the subject sits, and the half mirror 22 is disposed to face the subject.
[0008]
FIG. 2 shows a block diagram of an embodiment of the photographing / skin measuring unit 10, and FIG. 3 shows a perspective view thereof. In the photographing / skin measuring unit 10, a digital camera 26 is disposed at the center of the half mirror 22, and strobes 27, 28, and 29 are provided around the digital camera 26. The digital camera 26 shoots the flashes 27, 28, and 29 under the control of the personal computer 14, and the image data output from the digital camera 26 is supplied to the personal computer 14.
[0009]
Further, an irradiation lens 31 and a condensing lens 32 for spectroscopic measurement are provided at positions corresponding to the glass 24, and the irradiation lens 31 is connected to a halogen illumination unit 60 described later by an optical fiber 33, and the condensing lens 32 is an optical fiber 34. The spectroscope 35 is connected to the personal computer 14.
FIG. 3 shows a block diagram of an embodiment of the spectroscope 35. In the figure, the light introduced from the optical fiber 34 passes through the lens system 36, is diffracted by the diffraction grating 38, is dispersed, and is applied to the photodetector 40. The light detector 40 outputs a detection signal of the light intensity of each wavelength corresponding to the detection position in time series. This detection signal is amplified by the amplifier 42 and then digitized by the A / D converter 44 to the CPU 46. Supplied. The CPU 46 supplies the digitized detection data to the P / S converter 48, where the detection data is parallel / serial converted and supplied to the personal computer 14.
[0010]
The message display module 50 shown in FIGS. 2 and 3 is disposed at the lower end position of the half mirror 22. The message display module 50 is connected to the personal computer 14 via the interface circuit 52, and displays a message supplied from the personal computer 14 to the subject.
Returning to FIG. 1, the photographing / skin measuring unit 10 is provided with a remote control receiver 54 and receives a remote control signal from the remote control transmitter 56. The remote control receiver 54 is connected to the remote control unit 58 in the main unit 12, and the remote control signal is supplied to the personal computer 14 through the remote control unit 58.
[0011]
Here, when the subject sits on the chair and operates the button of the remote control transmitter 56 with his face photographed on the half mirror 22 as shown in FIG. 5, the message display module 50 is controlled by the control of the personal computer 14. Please sit down with the line in the center of your face. When you are ready, press the button. " The chair height is adjusted by the counselor, but the subject should adjust the chair height by adding a message such as “Make sure the tip of the reference line sticks to the head.” Also good.
[0012]
Thus, after positioning so that the center line of the face overlaps the reference line 23 written in the half mirror 22, when the button of the remote control transmitter 56 is operated, a remote control signal is supplied to the personal computer 14 and the main unit 12 The halogen lighting unit 60 emits light under the control of the personal computer 14, and the halogen light having a wide band in the visible light range emitted here is guided to the irradiation lens 34 shown in FIG. 2 through the optical fiber 33. The test subject's cheek is irradiated (for example, 15 cm in length and width). Note that the cheeks are less shining than the nose and forehead, and the original skin color can be observed.
[0013]
And the condensing lens 32 condenses the radiation | emission light (reflected halogen light) of the test subject's cheek part of the circular range 64 (for example, diameter 3cm) included in the said rectangular range 62, and the condensed light is spectroscope. To 35. The spectroscope 35 spectroscopically analyzes the radiant light of the subject's cheek in a visible light range of, for example, a wavelength of 360 nm to 750 nm in units of 1 nm, and supplies detection data of the analysis result to the personal computer 14.
[0014]
FIG. 6 shows a main flowchart of an embodiment of the skin color classification process of the present invention executed by the personal computer 14. This process is executed by receiving a remote control signal. In the figure, in step S10, the halogen illumination unit 60 is caused to emit light, and detection data output from the spectroscope 35, that is, spectral radiance Y (λ) is captured. Next, in step S12, the spectral reflectance R (λ) is calculated using equation (1).
[0015]
In step S12, the captured detection data is set as the spectral radiance Y (λ), the spectral reflectance RW (λ) of the white calibration plate (white reference) measured in advance by the reference spectroscope, and the spectroscope 35 in advance. Using the spectral radiance YW (λ) of the white calibration plate being measured (where λ is a wavelength in the visible light range of 360 nm to 750 nm), the spectral reflectance R of the subject's skin is expressed by equation (1). (Λ) is calculated.
[0016]
R (λ) = RW (λ) × Y (λ) / YW (λ) (1)
In this way, the subject's cheek is irradiated with halogen light from the irradiation lens 34 of the photographing / skin measurement unit 10, and the radiation light at the irradiation position is condensed by the condenser lens 32 and spectrally analyzed by the spectroscope 35. Since it is a contact type, it can prevent that the color of skin changes because an apparatus contacts skin. In addition to the halogen light, the subject's cheek is also exposed to the ambient light of the environment, and the skin color corresponding to the ambient light can be spectrally analyzed to accurately detect the skin color.
[0017]
In the next step S14, the spectral reflectance R (λ) is converted into a tristimulus value XYZ of color by a known arithmetic expression shown in the expressions (2) to (4).
X = Σ {R (λ) × Gx (λ)} / 100 (2)
Y = Σ {R (λ) × Gy (λ)} / 100 (3)
Z = Σ {R (λ) × Gz (λ)} / 100 (4)
However, Gx (λ), Gy (λ), and Gz (λ) are each a weight coefficient (known).
[0018]
Thereafter, the stimulus value XYZ calculated by the equations (2) to (4) in step S16 is converted from the Munsell color system Munsell value HVC (hue, brightness, saturation) according to a well-known conversion table defined in JIS Z 8721. ). Here, the hue value (H) on the Munsell value HVC is a value in the range of 0 to 10, and the hue symbols R, YR, Y, GY, G, BG, B, PB, P, and RP are taken into consideration. In order to perform skin color classification, the hue is further set as R = 1, YR = 2, Y = 3, GY = 4, G = 5, BG = 6, B = 7, PB = 8, P = 9, RP = 10. The symbol value (K) is defined, and the hue classification value (HK) is obtained from equation (5).
[0019]
HK = (K−1) × 10 + H (5)
In step S18, color symbols A, B, C, D, and E are obtained from the color system correspondence table shown in FIG. 7 using the hue classification value (HK). Further, the brightness numbers 6, 5, 4, 3, 2, 1, 0, −1, −2, −3 are obtained from the tone correspondence table shown in FIG. 8 using the brightness (V) of the Munsell value HVC. Thereafter, in step S20, the skin color is determined by developing the skin color classification map shown in FIG. 9 using the color symbol and the brightness number. Here, when the color symbol is C, it is determined that the color is normal, A and B are red, D and E are yellow, and when the lightness number is 2, it is determined that 3-6 is black, and 1-3 is white. ing.
[0020]
In the skin color classification map shown in FIG. 9, when the color symbol is C, it is normal, and when the lightness number is 2, the average value obtained by measuring the skin color of many Japanese women is used. ing.
Thereafter, the strobes 27 to 29 are caused to emit light in step S <b> 22, the face of the subject is photographed by the digital camera 26, and the obtained face image is stored in a hard disk device built in the personal computer 14. Next, a facial appearance determination is performed as to whether the subject's face is an adult type, a child type, a straight line type, or a curved type from the facial feature points extracted from the facial image in step S24. The face determination result is displayed on the display device 40, printed out by the printing device 50, and the process is terminated.
[0021]
Thus, the spectral reflectance of the skin is calculated from the spectral analysis result of the subject's skin, and further, the color information of the skin, that is, the Munsell value HVC (hue, lightness, saturation) of the Munsell color system corresponding to the characteristics of the human eye. Degree) and comparing the skin color of the subject with the existing skin color classification map, the skin color of the subject can be objectively, accurately and automatically classified.
[0022]
Therefore, it can be used as a tool for make-up counseling, and by using this skin color classification result as a guideline, the direction in which make-up should be applied to produce the target image is exceptional. You can know without skill.
The irradiation lens 31, the optical fiber 33, the halogen illumination unit 60, the condenser lens 32, the optical fiber 34, and the spectroscope 35 correspond to analysis means, step S12 corresponds to spectral reflectance calculation means, and steps S14 and S16 correspond to colors. Corresponding to the information conversion means, steps S18 and S20 correspond to the classification means.
[0023]
【The invention's effect】
As described above, the invention according to claim 1, the analysis means for irradiating the skin of the subject who is spaced apart with the halogen light, receiving the light from the skin and performing spectral analysis to obtain the spectral radiance,
Spectral for calculating the spectral reflectance of the skin using the spectral radiance obtained by the analyzing means, the standard spectral reflectance of the white calibration plate, and the spectral radiance of the white calibration plate measured in advance by the spectral means. Reflectance calculation means;
Color information conversion means for converting the spectral reflectance of the skin into skin color information;
Classification means for classifying a subject's skin color by comparing the skin color information with an existing skin color classification map.
[0024]
In this way, the halogen light is irradiated to the skin of the subject who is separated, the light from the skin is received and spectral analysis is performed, the spectral reflectance obtained as a reference of the white calibration plate, and the spectral means previously measured. In order to classify the skin color of the subject by calculating the spectral reflectance of the skin using the spectral radiance of the white calibration plate that is further converted into skin color information and compared with the existing skin color classification map, The skin color information of the subject can be accurately measured in a non-contact manner, and the skin color information can be compared with the skin color classification map to objectively and accurately classify the skin color of the subject.
[Brief description of the drawings]
FIG. 1 is a block diagram of one embodiment of a makeup counseling system including a skin color classification system of the present invention.
FIG. 2 is a block diagram of an embodiment of the photographing / skin measuring unit 10;
3 is a perspective view of an example of the photographing / skin measuring unit 10. FIG.
4 is a block diagram of an embodiment of the spectroscope 35. FIG.
FIG. 5 is a view showing a state where a face is photographed on a half mirror 22 of the photographing / skin measuring unit 10;
FIG. 6 is a main flowchart of an embodiment of the skin color classification process of the present invention executed by the personal computer 14;
FIG. 7 is a diagram showing a color system correspondence table;
FIG. 8 shows a tone correspondence table.
FIG. 9 is a diagram showing a skin color classification map.
[Explanation of symbols]
10 Shooting / Skin Measurement Unit 12 Main Unit 14 Personal Computer (PC)
16 CRT monitor 18 Printer 22 Half mirror 23 Reference line 24 Transparent glass 26 Digital camera 27, 28, 29 Strobe 31 Irradiation lens 32 Condensing lens 33, 34 Optical fiber 35 Spectrometer 36 Lens system 38 Diffraction grating 40 Photo detector 42 Amplifier 44 A / D converter 46 CPU
48 P / S converter 48
54 Remote control receiver 56 Remote control transmitter 58 Remote control unit 60 Halogen illumination unit

Claims (1)

Analyzing means for irradiating the subject's skin separated from the subject with halogen light , receiving light from the skin and performing spectral analysis to obtain spectral radiance,
Spectral for calculating the spectral reflectance of the skin using the spectral radiance obtained by the analyzing means, the standard spectral reflectance of the white calibration plate, and the spectral radiance of the white calibration plate measured in advance by the spectral means. Reflectance calculation means;
Color information conversion means for converting the spectral reflectance of the skin into skin color information;
A skin color classification system comprising: classifying means for classifying the skin color of a subject by comparing the skin color information with an existing skin color classification map.

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