JP2014180285A - Skin image generation system for analysis and skin image generation method for analysis - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a skin image generation system for an analysis which can acquire image data in which at least a texture (sulcus cutis, crista cutis, pores, or the like) is mainly captured and image data in which blotches are mainly captured from image data acquired by one photographing, and a skin image generation method for an analysis.SOLUTION: Two kinds of illumination light including illumination light which contains at least blue light and passes through a first polarizer 15 and illumination light which contains at least red light are emitted to a subject. While the illumination light is emitted, a skin as the subject is photographed through a second polarizer 16 whose polarizing direction is perpendicular to the polarizing direction of the first polarizer 15. Image data 34 of a blue component is extracted from the photographed image data 33 that is acquired and is used as the image data for analyzing blotches of the skin. Further, image data 35 of a red component is extracted from the photographed image data 33 and is used as the image data for analyzing a skin texture.

Description

  The present invention relates to an analysis skin image generation system and an analysis skin image generation method for generating an image for analyzing skin texture and skin spots.

Conventionally, the skin condition is analyzed from image data obtained by photographing the skin.
For example, skin texture, skin spots, skin color, and the like are analyzed from the image data. Skin texture refers to the condition of the skin surface. The skin surface has a number of grooves (skin grooves) that cross each other, and the skin is a skin that is slightly raised between these grooves. ing. Skin has pores.

  For example, when the texture is good, the pores are not conspicuous, the skin groove is shallow, and the state is relatively orderly. Such skin texture indicates the state of the skin surface, and in order to analyze the texture, an image of the skin surface is used. The skin color can also be analyzed using a color image obtained by photographing the skin surface.

On the other hand, since the stain is formed by depositing melanin slightly below the skin surface, it is necessary to photograph a layer slightly inside the skin surface. When the skin is illuminated and photographed, not only the illumination light is reflected on the skin surface, but also a part of the illumination light is transmitted through the skin surface and a spot in the skin surface layer is photographed. However, in the image photographed in this way, an image by reflected light on the skin surface is mainly photographed, and the spot image is hidden by the image on the skin surface, and this spot is not clearly visible. ing.
Therefore, an image based on the reflected light that has been transmitted through the skin surface and then reflected in the skin surface layer using two polarizing plates to make it difficult to capture an image based on the reflected light from the skin surface. It is done to be in a state of being photographed.

  That is, as shown in FIG. 13, polarizing plates 43 and 44 are arranged on the illumination light source 41 side and the photographing lens (camera 42) side, respectively, and the polarization directions d1 and d2 of these polarizing plates 43 and 44 are set. The skin is photographed by arranging them so as to be orthogonal to each other. In such a case, the reflected light on the skin surface 45 does not change the polarization direction d1 polarized by the light source side polarizing plate 43, and the polarization direction d2 in which the polarization direction on the lens side is orthogonal to the polarization direction d1. Cannot pass through the polarizing plate 44. On the other hand, the light reflected after being transmitted into the skin surface layer portion 46 has a polarization direction random due to multiple scattering of light within the skin surface layer portion 46, and the polarization direction d2 of the polarizing plate 44 on the lens side. The light passes through the polarizing plate 44 because it contains a large amount of light in a polarization direction that is not orthogonal to the polarizing plate. Thereby, the image of the spot in the skin surface layer part 46 from which the reflected light of the skin surface 45 was cut can be obtained (for example, refer patent document 1).

  For example, a white LED is used as the light source 41 described above. There are a plurality of types of white LEDs. For example, a white LED including a blue LED that emits blue light and a phosphor that emits yellow fluorescence when irradiated with blue light can be used as the light source 41. . As shown in FIGS. 14 and 15, the light source spectrum of such a white LED has a narrow peak of the blue wavelength based on the blue LED and a peak at the yellow wavelength based on the phosphor, and from green to red. It consists of wide peaks.

  Here, the white LED whose light source spectrum is shown in the graph of FIG. 14 (white LED of FIG. 14) is relatively compared with the white LED whose white light spectrum is shown in the graph of FIG. 15 (white LED of FIG. 15). The yellow peak is higher than the blue peak. Accordingly, the white LED in FIG. 15 has high skin color rendering properties and is suitable for photographing skin texture. On the other hand, the white LED in FIG. 14 has a higher blue light peak than a yellow light peak and does not necessarily have a high skin color rendering property. However, the melanin constituting the stain has a higher absorbance for light having a shorter wavelength than light having a longer wavelength, for example, absorbance for blue light is higher than that for red light.

  Therefore, when photographing a spot, the peak of light of blue wavelength is relatively higher than that of light of shorter wavelength than the white LED of FIG. When the white LED is used, the difference in brightness between the portion where the dark melanin appears darker and the portion where the dark melanin appears brighter becomes larger and the image of the stain becomes clearer.

  Therefore, when photographing the skin, both the white LED of FIG. 14 and the white LED of FIG. 15 are prepared, the white LED of FIG. 14 is used for photographing the skin stain, and FIG. 15 is used for photographing the skin texture. It is preferable to use two types of illumination (white LED) properly so as to use white LEDs.

JP 2008-289706 A

  By the way, when analyzing skin texture, skin spots, etc. from the captured image data, when taking an image for analyzing skin spots using two polarizing plates as described above, Since the skin surface image is hardly included, it is necessary to take a separate image for analyzing the skin texture.

  That is, when analyzing at least both skin texture and skin stain, an image for spot analysis taken using two polarizing plates and a texture analysis taken without using a polarizing plate An image is required, and two images are required for one analysis. For the analysis of the skin color, if the image data taken for skin texture is color, this image data can be used.

In addition, there is a demand to easily analyze the skin condition at home, and a skin camera for home use that captures the texture analysis image and the stain analysis image as described above has been proposed.
For example, such a skin camera is connected to a portable electronic device such as a smartphone, and images captured by the skin camera are captured in the smartphone and processed, or the captured image data is transmitted from the portable electronic device via the Internet. It has been proposed to transmit to a server that provides services such as skin image analysis.
In addition, a lens module having a conversion lens that is mounted at a position corresponding to the camera portion of a smartphone and that can capture an image for skin analysis with the camera of the smartphone has been proposed.

  In the lens module having the skin camera or the conversion lens, in order to capture the above-described spot analysis image and texture analysis image, for example, a spot photographing illumination device that illuminates via a polarizing plate, and a polarizing plate It is necessary to shoot the skin at least twice by switching between the lighting devices and the illumination device for texture photographing that illuminates without intervention, which makes the photographing by the user complicated.

  In the skin camera, a camera, a lens, and illumination are included in one device, and these can be controlled by a control device of the skin camera. On the other hand, when the lens module is attached to the camera of the smartphone, the LED lighting of the camera provided on the smartphone is set to shoot a subject about 1 m away from the camera. When photographing skin, there is a possibility that the color will be too bright and white. Moreover, the LED illumination provided in the smart phone is illumination for normal photography, and there is no polarizing plate.

  Therefore, it is necessary to provide a lighting device for skin photographing on the lens module side. For example, when a lens module is equipped with an illumination LED with a polarizing plate and an illumination LED without a polarizing plate, it is necessary to switch between two types of illumination to shoot, but the lens module and smartphone communicate with each other. When the connection is not possible, it is difficult to perform control so that two types of illumination are automatically switched and the image is taken twice. When shooting twice with manual illumination switching, there is a risk that the user may find it cumbersome to manually switch between the two types of illumination and perform twice imaging.

  When the lens module is provided with various known communication means such as USB, Bluetooth (registered trademark), WiFi, NFC, etc. that can communicate with the smartphone so that it can automatically switch between the two types of illumination. Module costs increase.

  The present invention has been made in view of the above circumstances, and image data in which at least mainly texture (skins, hides, pores, etc.) is captured from image data obtained by one photographing, and mainly stains. An object of the present invention is to provide an analysis skin image generation system and an analysis skin image generation method capable of obtaining image data including the image.

In order to solve the above problems, an analysis skin image generation system of the present invention is an analysis skin image generation system that generates skin image data that can analyze skin spots and skin texture,
A first illumination means comprising: a light source that emits illumination light including at least blue light; and a first polarizing plate that polarizes illumination light emitted from the light source;
Second illumination means comprising a light source for irradiating illumination light including at least red light;
Photographing means for photographing the subject illuminated by both the first illumination means and the second illumination means via a second polarizing plate whose polarization direction is orthogonal to the first polarizing plate;
Storage means for storing image data of the subject photographed by the photographing means;
And image extracting means for extracting blue component image data from the image data of the subject stored in the storage means.

The skin image generation method for analysis of the present invention is a skin image generation method for analysis that generates skin image data that can analyze skin spots and skin texture,
Polarized light with respect to the first polarizing plate in a state where the subject is irradiated with two illumination lights including at least blue light and passing through the first polarizing plate and at least red light. Blue component image data is extracted from image data obtained by photographing the subject through a second polarizing plate having orthogonal directions.

  According to such a configuration, the skin as a subject in a state illuminated with illumination light including at least blue light and passing through the first polarizing plate and illumination light including at least red light is photographed. Image data for analysis of skin texture in which the surface of the skin for analyzing the texture of the skin was photographed from the obtained single image data, and a stain in the surface layer of the skin were photographed (if there is a stain) Image data for analyzing skin spots can be obtained.

  A spot made of melanin absorbs blue light more than red light. Therefore, it is possible to photograph the spot more clearly when shooting with blue light than when shooting with red light. In other words, the spot image becomes lighter in an image taken with red light.

  Blue wavelength light is not necessarily highly permeable to the inside of the skin, but blue light is transmitted to the skin surface layer where the spots are formed, that is, to the shallow part of the skin, and to melanin as described above. Photographed so that spots are darkened after being absorbed. However, since the blue reflected light reflected on the skin surface is photographed, the skin surface image and the spot image are mixed, and the spot image cannot be clearly recognized.

  Therefore, a first light source and a second polarizing plate having polarization directions orthogonal to each other are provided at least on the light source side that emits blue illumination light and on the photographing lens side, thereby taking a picture with a blue light source. In the image data, the image data of the skin surface is cut by the two polarizing plates, and a stain image is included as a main image. Here, by extracting the image data of the blue component from the photographed image data, it is possible to obtain an image in the skin surface layer portion in which the image of the skin surface is cut. That is, it is possible to obtain spot analysis image data.

  When irradiating the subject's body with the above-mentioned blue illumination light, the illumination light containing red is radiated together without going through the first polarizing plate. Analysis of the texture becomes possible. That is, the photographed image data includes at least an image of the skin surface that can analyze the texture of the skin based on the unpolarized red illumination.

  In the skin image generation system for analysis according to the present invention, it is preferable that the image extraction unit extracts red component image data in addition to blue component image data from the image data of the subject.

  In the analysis skin image generation method of the present invention, it is preferable to extract red component image data in addition to blue component image data from the image data of the subject.

  According to such a configuration, in the photographed image data, an image of the skin surface photographed mainly with red light and an image of a stain (melanin) in the skin surface layer photographed mainly with blue light. In contrast, the red component image does not contain much of the image of the melanin in the skin surface layer, and the red component image data suitable for texture analysis is Can be used for analysis.

  In the analysis skin image generation system of the present invention, the first illumination means emits blue illumination light, and the second illumination means has a longer wavelength than yellow light emitted from the first illumination means and becomes yellow. It is preferable to irradiate illumination light in a visible wavelength range.

  In the analysis skin image generation method of the present invention, one of the two illumination lights irradiated to the subject is blue illumination light, and the other illumination light has a longer wavelength than blue. Illumination light in a wavelength range that looks yellow is preferable.

  According to such a configuration, the subject is irradiated with blue illumination light and yellow illumination light. In this case, blue light and yellow light have a complementary color relationship, and when these luminances are adjusted, white light is obtained. Therefore, a color image can be taken using these illumination lights, and the taken image data can be used for analysis of skin color. In analyzing skin color, it is necessary to take white balance.

Further, in the analysis skin image generation system of the present invention, the photographing means comprises a camera mounted on a portable electronic device and a skin photographing conversion lens provided in a lens module attached to the camera. And
It is preferable that the lens module includes the first illuminating unit having the first polarizing plate, the second illuminating unit, and the second polarizing plate.

  According to such a configuration, since it is possible to obtain image data that can analyze both the texture and the stain by photographing once with two types of illumination without switching the type of illumination and photographing multiple times, the lens can be obtained. Skin can be easily photographed without providing a communication means between the module and a portable electronic device such as a smartphone.

Further, the skin image generation system for analysis of the present invention is a skin image generation system for analysis that generates skin image data that can analyze skin spots and skin texture,
An illumination means comprising: a light source that emits illumination light including at least blue light and red light; and a first polarizing plate that polarizes illumination light emitted from the light source;
A photographing means for photographing the subject illuminated by the illuminating means through a second polarizing plate relatively set in a polarization direction obliquely intersecting with a polarization direction of the first polarizing plate;
Storage means for storing image data of the subject photographed by the photographing means;
And image extracting means for extracting blue component image data from the image data of the subject stored in the storage means.

The skin image generation method for analysis of the present invention is a skin image generation method for analysis that generates skin image data that can analyze skin spots and skin texture,
In a state where the subject is irradiated with illumination light including at least blue light and red light through the first polarizing plate that polarizes the light,
Image data of a blue component is extracted from image data obtained by photographing the subject through a second polarizing plate that is relatively set in a polarization direction that obliquely intersects the polarization direction of the first polarizing plate. And

  According to such a configuration, since the polarization direction of the first polarizing plate and the polarization direction of the second polarizing plate are inclined, the reflected light on the skin surface where the polarization direction of the first polarizing plate is maintained is The brightness of the image on the skin surface, part of which can pass through the second polarizing plate, is lowered.

  Skin spots are melanin in the surface layer of the skin, and the absorbance of blue is higher than that of red. Although the skin of blue light is not high in transmittance, the image data captured by the blue light that penetrates to the melanin portion of the skin surface layer portion includes spots. Further, as described above, the reflected light on the skin surface is partially cut by the two polarizing plates. In this case, when the blue component of the captured image data is viewed by adjusting the angle at the time of designing or manufacturing the two polarizing plates, it is possible to make the spot image easier to see than the image on the skin surface. The blue component image data can be used for spot diagnosis.

  Further, in the captured image data, a part of the reflected light on the skin surface is cut, so the image on the skin surface becomes thin, but it can be used for diagnosis of skin texture. Therefore, image data for skin texture analysis can be obtained by irradiating the subject with illumination light through the first polarizing plate and the second polarizing plate whose polarization directions are oblique to each other and performing one shooting. Thus, it is possible to obtain image data for skin spot analysis, and to prevent complicated imaging for skin condition analysis.

  In the analysis skin image generation system of the present invention, it is preferable that the image extraction means extracts red component image data in addition to blue component image data.

  In the analysis image generation method of the present invention, it is preferable to extract red component image data in addition to blue component image data from the image data of the subject.

  According to such a configuration, the melanin stain as described above is easier to absorb blue light than red light, and thus is photographed with illumination light including at least blue light and red light as described above. The red component of the image data does not contain much spot images, and even if the skin surface image is partially cut by the polarizing plate, a clearer skin surface image can be obtained than the captured image data. . If white light including blue and red is used as illumination, the captured image data can be used for skin color analysis. In this case, it is preferable to take a white balance.

In the analysis skin image generation system of the present invention, the imaging means is configured by a camera mounted on a portable electronic device and a skin shooting conversion lens provided in a lens module mounted on the camera,
It is preferable that the lens module includes the illumination unit including a first polarizing plate and a second polarizing plate.

  According to such a configuration, it is possible to obtain image data that can analyze both the texture and the stain by photographing once with one illumination without changing the type of illumination and photographing a plurality of times. The skin can be easily photographed without providing a communication means between the mobile phone and a portable electronic device such as a smartphone.

  According to the present invention, image data capable of analyzing texture and image data capable of analyzing spots can be obtained by one imaging, and skin imaging for analyzing skin texture and spots can be easily performed. Can be a thing.

It is a schematic sectional drawing which shows the smart phone with which the lens module of the skin image generation system for analysis concerning the 1st Embodiment of this invention was mounted | worn. It is a schematic front view which shows the conversion lens in the said lens module, and a circuit board provided with LED. It is a block diagram which shows the outline of the skin image generation system for analysis. It is a block diagram which shows the outline of the modification of the skin image generation system for analysis. It is a figure for demonstrating the production | generation method of the image data for skin spot analysis and texture analysis. It is a figure for demonstrating the production | generation method of the image data for skin spot analysis and texture analysis. It is a figure for demonstrating the calculation result of the image data for skin spot analysis, (a) is a figure of the image data which displayed the image of the image | photographed color in gray scale, (b) The image | photographed color It is the figure of the image data which displayed the image data of the red component extracted from the image data of (2) in gray scale, (c) is an image showing the image data of the blue component extracted from the color image data in gray scale It is a figure of data. It is a schematic sectional drawing which shows the smart phone with which the lens module of the skin image generation system for analysis concerning the 2nd Embodiment of this invention was mounted | worn. It is a schematic front view which shows the circuit board provided with the conversion lens and LED in the said lens module. It is a figure for demonstrating the production | generation method of the image data for skin spot analysis and texture analysis. It is a block diagram which shows the outline of the skin image generation system for analysis. It is a block diagram which shows the outline of the modification of the skin image generation system for analysis. It is a figure for demonstrating the imaging | photography principle of the skin spot image using a polarizing plate. It is a graph which shows the light source spectrum of white LED suitable for a skin spot image photography. It is a graph which shows the light source spectrum of white LED suitable for the texture image photography of skin.

The first embodiment of the present invention will be described below with reference to the drawings.
As shown in FIGS. 1 and 2, the analysis skin image generation system of this embodiment includes a smartphone 1 as a portable electronic device including a digital camera (a camera 2 including an imaging device), and a camera of the smartphone 1. A lens module 10 having a conversion lens 11 composed of two lenses 11a and 11b that are attached to 2 for enlarging the skin and taking close-up images, and two first and second LEDs 12a and 12b for photographing illumination. Prepare.

In the analysis skin image generation system, the first LED 12 a serves as a first illumination unit that illuminates the skin, and the subject is irradiated with blue illumination light via the first polarizing plate 15. The 1st polarizing plate 15 is provided so that the LED element of 1st LED12a may be covered. Further, the LED 12b irradiates the subject with illumination light including red light, and the LED 12b serves as second illumination means for irradiating the skin as the subject with illumination light including at least red light.
The camera 2 and the conversion lens 11 serve as photographing means for photographing the skin as a subject illuminated by both the first and second illumination means via the second polarizing plate 16.

  In addition, the analysis skin image generation system includes storage means for storing image data obtained by photographing the skin as the subject illuminated by the first and second illumination means with the photographing means, and the image data. Image processing means for generating image data for spot analysis and image data for texture analysis. This storage means may be a later-described flash memory 4 of the smartphone 1, and the image processing means may be a later-described control device 3 of the smartphone 1.

  That is, as shown in FIG. 3, the smartphone 1 is irradiated with the conversion lens 11, the first illumination means a (LED 12 a) that emits at least blue light, and at least red light at the position of the camera 2. A lens module 10 including a second illumination unit b (LED 12 b) is attached, and the conversion lens 11 and the camera 2 constitute an imaging unit c.

The first illumination means a of the lens module 10 is provided with a first polarizing plate 15, and a second polarizing plate 16 is provided at a position closer to the camera 2 than the conversion lens 11. The first polarizing plate 15 and the second polarizing plate 16 have their polarization directions orthogonal to each other.
Further, the smartphone 1 includes a storage unit d configured by a flash memory 4, and temporarily stores image data of the skin that is illuminated by the first illumination unit a and the second illumination unit b and is captured by the imaging unit c. Stored in means d.

  In addition, the smartphone 1 includes a communication unit e, can be connected to the Internet f by connecting to a mobile communication network or a wireless LAN, and the skin image stored in the storage unit d described above. Data is transmitted to a data management server (server) g via the Internet f. The data management server g analyzes the skin state from the skin image data transmitted from each smartphone 1, and determines how good (or bad) the skin state is.

  In addition, the data management server g manages skin image data, data of skin condition analysis determination results, and the like for each user, for example, and enables the user to view these data using the smartphone 1. Data such as skin image data and judgment results of skin condition analysis can be used by excluding information that can identify individuals from companies related to skin such as a company.

  Such a data management server g includes a communication means i that enables data communication with the smartphone 1 via the Internet f, skin image data transmitted from the smartphone 1 via the Internet, and analysis of the skin image data. The skin history database j in which the skin condition determination result and the like are registered is provided. The data management server g also includes a control device that functions as the image processing means k, and this control device extracts blue component image data and red component image data from the captured image data, as will be described later. Functions as the image extraction means m.

  The image processing means k uses the above-described red component image data, generates a determination result of the quality of the skin texture by a known determination algorithm, and uses the above-described blue component image data, It functions as an analysis determination means n that generates a determination result of good or bad skin spots by a known determination algorithm. The determination result by the analysis determination unit n is stored in the skin history database j as a storage unit in association with each user.

  In addition, as shown in FIG. 4, it is good also as what performs the process of the image data of the image | photographed skin with the smart phone 1, and the smart phone 1 is the above-mentioned 1st illumination means a, 2nd illumination means b, imaging | photography means c, In addition to the storage unit d, the image processing unit k, the image extraction unit m, and the analysis determination unit n are provided. The data of the determination result by the analysis determination unit n is stored in the storage unit d in association with the skin image data used for the analysis.

  Further, the photographing means c is not only the camera 2 and the conversion lens 11 of the lens module 10 described above, but is a single skin camera 5 capable of photographing the skin as in the case of using the conversion lens 11. Also good. The skin camera 5 is capable of data communication with the smartphone 1 via a communication means such as USB, and the captured image data is transmitted from the skin camera to the smartphone 1 and stored in the storage means d. The Note that a storage device such as a flash memory may be provided on the skin camera side so that image data captured by the skin camera can be stored.

The lens module 10 includes the conversion lens 11 and the first and second LEDs 12a and 12b described above, an LED drive circuit 14 that drives the first and second LEDs 12a and 12b, and a housing 10a that houses them. . Within the housing 10a, the two lenses 11a and 11b of the conversion lens 11 are supported by the barrel 20a, and in front of the master lens (not shown) of the camera 2, the optical axis of the master lens of the camera 2 and the two lenses It arrange | positions so that the optical axis of lenses 11a and 11b may be matched.
A second polarizing plate 16 provided in the lens module 10 is disposed between the conversion lens 11 and the camera 2 (master lens thereof). The first polarizing plate 15 and the second polarizing plate are arranged so that their polarization directions are orthogonal to each other.

  The housing 10a includes a lens housing 20 on the front side (subject side) of the barrel 20a. The lens housing 20 has a front end surface that is a contact portion 20b that comes into contact with the skin when photographing the skin as a subject, and blocks outside light in a state where the contact portion 20b is in contact with the skin. Further, an opening 20c is formed in the contact portion 20b, and a portion facing the skin opening 20c is photographed.

  The barrel 20a is fixed to the base end side (the side attached to the camera 2) of the lens housing 20 in the housing 10a while supporting the conversion lens 11 including the lens 11a and the lens 11b. As shown in FIGS. 1 and 2, the first and second LEDs 12 a that irradiate the illumination light for photographing toward the opening 20 c of the contact portion 20 b of the lens housing 20 in the housing 10 a. , 12b and an LED drive circuit 14 for driving the first and second LEDs 12a, 12b are supported.

  The circuit board 13 includes, for example, one first LED 12a and one second LED 12b. For example, the plurality of LEDs 12a and the plurality of LEDs 12b illuminate the skin from different positions. May be provided. Further, one second LED 12b for obtaining image data for analyzing skin texture may be provided, and a plurality of first LEDs 12a for obtaining image data for analyzing skin spots may be provided. Basically, lighting unevenness can be reduced by increasing the number of lighting installation locations. However, in photographing skin texture, the contrast of skin images having skin grooves, skin ridges, and pores that are uneven in skin is higher when one illumination is applied, and the image is more suitable for texture analysis.

  That is, in photographing an image with clear skin texture, it is preferable to arrange one second LED 12b that irradiates light obliquely to the skin, but the brightness of the skin photographing range is averaged. Above, it is preferable to arrange | position the 1st and 2nd LED12a, 12b in multiple places, respectively. Note that the texture is basically skin irregularities, and by irradiating light on the skin obliquely from one light source, the shadows of the skin irregularities become clear and the image of the skin irregularities becomes easy to understand.

Since the LED drive circuit 14 is provided with a booster circuit and a constant voltage circuit, the LED illuminance lowering problem during use does not occur.
Further, the lens housing 20 is in a light shielding state so that ambient light does not enter the imaging region. Accordingly, a substantially constant shooting condition can be secured at all times, and an image correction process based on a difference in shooting condition for each shooting is not required.

The lens module 10 also includes a power supply circuit 18 including a battery for supplying power to the first and second LEDs 12a and 12b, the LED drive circuit 14, and the like, and a power switch (not shown).
The power switch may be a mechanical switch that is manually turned on / off.

Further, a structure may be adopted in which a switch is automatically turned on when the abutting portion 20b of the lens housing 20 abuts against the skin by providing a push switch in the abutting portion 20b of the lens housing 20 against the skin.
For example, the lens housing 20 and the contact portion 20b are separate members, and the contact portion 20b is supported by the lens housing 20 so as to be movable from the lens housing 20 to the subject side, and is elastically (biasing means). The contact portion 20b is biased toward the subject, and the lens housing 20 and the contact portion 20b are always separated from each other by a predetermined distance. The lens housing 20 is provided with a switch that is turned on when a push switch or the like is pressed between the lens case 20 and the contact portion 20b and turned off when the pressure is released. With such a structure, when the contact portion 20b is applied to the skin that is the subject and the contact portion 20b moves toward the lens housing 20 against the urging force of the elastic member, the switch is pressed. When the contact portion 20b is separated from the skin, the contact portion 20b biased toward the skin side is separated from the switch and the power is turned off.
In addition, a photoelectric switch is provided inside the lens housing 20, and when the skin is brought into contact with the contact portion 20 b of the lens housing 20 and the entrance of light into the lens housing 20 is blocked, the inside of the housing is The photoelectric switch may be turned on when dark.

  As is well known, the smartphone 1 has a function as a mobile phone and can make a call using a wireless line. In addition, the smartphone 1 has a display (not shown), can be connected to the Internet via a wireless line, can send and receive e-mails via the Internet, and can browse a website by a browser as an application (app). It has become. In addition, for example, a file can be uploaded to a server such as a website, and the file can be downloaded from the server such as a website.

In addition, the smartphone 1 includes a control device 3 having a CPU, a ROM, a RAM, and the like, and can execute an application as a program. The control device 3 is connected to a flash memory 4 as a storage device, and can store downloaded applications (programs), music files, moving image files, still image files, and the like. The moving image file and the still image file include image data captured by the camera 2.
That is, the control device 3 can take a picture by controlling the camera 2 and can save the taken image data in the flash memory 4. In addition, image data can be analyzed and analyzed by an application for image processing and image analysis.

In this embodiment, red component image data and blue color from still image data obtained by photographing the skin as a subject illuminated by the first and second LEDs 12a and 12b with the camera 2 using the lens module 10. By extracting image data of components, image data that can analyze spots and image data that can analyze textures are generated, and the image processing is performed by the control device 3 of the smartphone 1.
As described above, image data is sent from the smartphone 1 to the above-described data management server, and on the data management server side, the image data photographed by the smartphone 1 is stored and image processing of this image data is performed. Image data used for analysis may be obtained.

  Here, in a general digital camera including a camera built in a smartphone or the like, a color filter in which red, green, and blue single color filters are arranged in a predetermined pattern corresponding to each pixel may be used in an image sensor. . In this case, depending on the sensor of each pixel, there are a sensor for photographing the red component, a sensor for photographing the green component, and a sensor for photographing the blue component. The values from the sensors of the respective colors at these positions indicate the brightness (luminance) of the light transmitted through the corresponding filter.

  The luminance data for each pixel may be output as RAW data as it is, but usually a color image having red, green, blue, that is, RGB values for each pixel by interpolation processing, color adjustment, or the like. It is converted into data and output from the camera. Note that the color filter is not necessarily a red, green, and blue pattern, and these complementary colors may be used, or a four-color filter may be used instead of three colors, and the image data is not limited to the RGB system. Although there are other types of image data, in any case, it is possible to convert the color of each pixel into RGB type image data indicated by RGB values.

  Each pixel is image data represented by RGB values, and image data using only the R value for each pixel, that is, image data with G and B values of 0 is red component image data, In the pixel, the R and B values are 0, and the image data using only the G value is the green component image data. In each pixel, the R and G values are 0 and only the B value is used. The image data is blue component image data. That is, in the image data composed of the RGB values of each pixel, by setting two values of RGB to 0, it is possible to extract red component image data, green component image data, and blue component image data.

  When red component image data is displayed, it becomes a red shade image, when green component image data is displayed, it becomes a green shade image, and when blue component image data is displayed, it becomes a blue shade image. In this case, for example, when image data of red component is used for texture analysis, it may be difficult to see an image composed of red and light.

  Therefore, in the red component image data, the G value and the B value can be converted to a black and white image (grayscale image) by setting the value of G and B to the same value as R instead of 0. Similarly, the image data of the green component and the image data of the blue component can be converted into a gray scale image by aligning the RGB values to the G value or the B value.

In addition, image data, which is a difference described later, basically has a luminance difference between a red component and a blue component, and is handled as grayscale image data.
Here, the grayscale image data may be converted to a skin color by image processing.

  In this case, for example, after color-correcting the skin image data photographed as described later, a reference skin color is determined using the corrected skin image, and each RGB value of each pixel is set, A skin color-based texture image / stain image can be obtained.

  For example, RGB values at a predetermined brightness are set. In this case, for example, RGB values are set as R: 98/256, G: 68/256, B: 58/256, etc., and this is used as a skin color pattern and converted to the above skin color. Corresponding to the change in luminance of the image of the grace case, image data composed of a gradation of skin color can be obtained by raising and lowering each RGB value while maintaining the above pattern.

  Further, by calculating a “fluctuation” pattern of pixel luminance values from the skin image and setting each value of RGB, a skin color-based texture image / stain image that seems to be more actual skin can be obtained. That is, a more natural skin color can be expressed by shifting the above-mentioned pattern slightly in each pixel.

The first LED 12a is a first illumination means for illuminating the skin, and a blue LED is used. In the first illumination means that emits light including blue light, a white LED is used instead of the blue LED by passing a blue light through the white LED and blocking a longer wavelength light. It is good. Further, the first LED 12a may irradiate other light in addition to blue light as long as it irradiates the subject with illumination light including blue light, and may use a white LED.
Further, the second LED 12b as the second illumination means may be a red LED alone or a combination of a red LED and a green LED. Further, a red filter that passes red through a white LED or a yellow filter that passes yellow may be provided to polarize white light into red or yellow light. Here, for example, an LED in which a yellow filter is provided on a white LED is referred to as a second LED 12b. The second illuminating means needs to contain almost no light below the wavelength of blue light. When an LED that outputs blue light or light having a wavelength shorter than that is used, these lights are used. Must be cut with a filter.

  In addition, there are a plurality of types of white LEDs. For example, a white LED that combines a blue LED and a phosphor that glows yellow when irradiated with blue light and a red LED that emits ultraviolet light emits red light. There are white LEDs that combine a plurality of types of phosphors that emit green and blue, white LEDs that combine blue LEDs that emit blue light, green LEDs that emit green light, and red LEDs that emit red light. When the white LED and the filter are combined to form the first LED 12a and the second LED 12b, any white LED may be used.

When using an LED device in which each of red, green and blue LEDs is mounted as a white LED, by using a white LED in which the first polarizing plate 15 is attached to a blue LED in the white LED, the first LED 12a and The second LED 12b can be a white LED.
That is, according to such a white LED, the same configuration as that of the combination of the first LED 12a made of a blue LED including the first polarizing plate 15 and the second LED 12b having a red LED and a green LED can be used. it can.

  The first illumination means in this embodiment needs to emit at least blue light. For example, it is preferable that light having a wavelength included in the range of 450 to 495 nm can be emitted. Further, the second illuminating means needs to emit at least red light, and preferably emits light having a wavelength included in the range of 620 to 750 nm, for example. Further, as described above, it is preferable that the second illumination unit does not include light having a wavelength of 495 nm or less.

Next, the image data of the skin image | photographed using the illumination light of both the illumination light by 1st LED12a and the illumination light by 2nd LED12b is demonstrated.
Here, the stain is formed from melanin deposited in the skin surface layer. In the absorption spectrum of melanin, the shorter the wavelength, the higher the absorbance, and blue light having a shorter wavelength is more absorbed than red light having a longer wavelength.

Therefore, for example, when the skin is photographed with white light illumination, the melanin-rich portion is darkened by the blue component of the captured image data, but is not so dark by the red component, and the blue component is the red component. The stain becomes clearer.
That is, in the skin surface layer portion, there are a portion of a stain with a large amount of melanin and a portion other than a stain with a small amount of melanin, and in the red component image data, the absorbance of melanin red light is low. Even in many spots, the red light is reflected to the camera 2 side with little absorption. Therefore, the brightness on the image data does not decrease much even at the spot portion.

  In the portion where the amount of the stain is small, red light is further absorbed, but the difference between the luminance of the portion of the stain on the red component image data and the luminance of the portion other than the stain is small. Therefore, in the red component image data, the spot image is a low-contrast image with a small difference between light and dark, and the spot is visible, but there is little difference in brightness between the spot and the part other than the spot and the spot is difficult to see. It becomes image data.

  On the other hand, in the blue component image data, the absorption of blue light from melanin is high, so the blue light reflected from the melanin-rich spot in the skin surface is absorbed by the spot and the camera is absorbed. Reflected to the second side. Accordingly, in the blue image data obtained by photographing the reflection of the blue light that has been absorbed in a large amount by melanin, a stain having a large amount of melanin appears darker. Even in the blue light, the blue light is not so much absorbed in the portion with a small amount of melanin other than the stain. Therefore, the difference between darkness and lightness of the spot portion and the other portions is large, resulting in an image with high contrast, and an image that allows easy viewing of the spot.

  Therefore, in the image data of the red component, the image of the skin surface is the main image and the image of the stain is considerably thin in the image data of the red component, whereas in the image data of the blue component, the image of the skin surface is relatively thin. And a darker (darker) spot image than in the case of red.

  FIG. 5 is a schematic diagram of image data schematically showing a skin skin groove with a plurality of lines intersecting each other as a skin image, and schematically showing spots in a cloud shape. In the image data 31 photographed by the blue first LED 12a including the first polarizing plate 15 and the second polarizing plate 16, the image of the skin surface (skin groove) represented by lines intersecting with each other is cut. An image of a spot in the skin surface layer portion, which is mainly expressed in a cloud shape, is taken. That is, the reflected light on the skin surface of the blue light that has passed through the first polarizing plate 15 does not change the polarization direction, and is the second polarized light arranged in the polarization direction orthogonal to the polarization direction of the first polarizing plate 1. The image cannot be passed through the board, and the skin surface image is cut without being taken by the camera 2. On the other hand, the light reflected after passing through the skin surface layer portion has a random polarization direction due to multiple scattering, passes through the second polarizing plate, and is photographed by the camera 2.

  In addition, since the image data 32 captured by being irradiated with the light of the second LED 12b that emits yellow light is reflected from the skin of the light of the second LED 12b that is not polarized, passes through the second polarizing plate 16. Basically, an image of the skin surface and an image of a stain in the skin surface layer portion are included, but even if there is a stain, the stain is in a thinner state than in the case of blue light. Therefore, image data of the skin surface is mainly taken.

Therefore, the photographed image data 33 photographed with the illumination light of both the first LED 12a and the second LED 12b intersects with the image data 31 in the skin surface layer portion indicated by cloud-like spots in FIG. The image data 32 on the skin surface indicated by the line is combined.
When the blue component image data 34 is extracted from the photographed image data 33 as shown in FIG. 6 by the control device 3 as the image processing means (image extraction means) of the smartphone 1, the first polarizing plate 15 and the second polarized light described above. Image data 34 based on the blue light that has passed through the plate 16 is obtained. In the blue component image data 34, the skin surface is cut as described above, and a stain image having a high absorbance of blue light is included. 7 shows the red component image data 52 shown in FIG. 7B and the blue component image data shown in FIG. 7C extracted from the actual captured image data 51 shown in FIG. 7A. 53 is shown.

Further, when the red component image data 35 is extracted from the captured image data 33, an image of the skin surface based on mainly red light out of yellow light is obtained. The image data 35 is mainly an image of the skin surface because the absorbance of the red light of the stain is low. That is, in the image data shown in FIG. 7, the captured image data 51 includes a blue component stain image and is mixed with the texture image. However, in the red component image data 52, the stain image is The image data is thinner and easier to see than the photographed image data.
Here, the blue component and the red component are, for example, a B value (brightness and luminance) and an R value (brightness and luminance) when image data is expressed in RGB.

  The photographed image data 33 is a color image photographed with white illumination by adjusting the luminance of the first LED 12a and the second LED 12b, and is image data capable of analyzing the skin color. When used for skin color analysis, it is necessary to take white balance. The photographed image data 33 includes both the image data on the surface of the skin and the image data in the surface layer portion of the skin, and the texture of the skin can be analyzed using the photographed image data 33. Therefore, it is possible to analyze the texture without extracting the red component image data. However, if the red component image data has a stain, the stain image becomes lighter. It is preferably used for texture analysis.

  In such a skin image generation method for analysis in such a skin image generation system for analysis, captured image data 33 obtained by a single shot of illumination with illumination light from both the first LED 12a and the second LED 12b. Therefore, for example, the blue component image data 34 that can analyze the stain, the red component image data 35 that can analyze the texture, and the captured image data 33 that can analyze the skin color are obtained.

  From the above, in such a skin image generation system for analysis and a skin image generation method for analysis, image data for analysis of skin spots, image data for analysis of skin texture, It is possible to obtain skin color analysis image data, make it easy to shoot skin images for skin analysis, and reduce the burden on users when each user shoots their own skin can do.

  In addition, when the lens module 10 is attached to a digital camera of a portable electronic device and a skin image is taken, for example, it is possible to use a predetermined illumination without changing the type of illumination or changing various shooting settings. Since the image data that can analyze each of the above-mentioned skin spots, textures, and colors can be obtained by performing the image capturing a number of times, the image capturing can be easily performed without automating the image capturing.

  Further, even if the shooting is automated, it is not necessary to switch the illumination and setting and perform shooting a plurality of times as in the conventional case, so basically the lens module 10 having the conversion lens 11 and the LEDs 12a and 12b for illumination. With the LED 12 turned on with the power on the side turned on, for example, the smartphone 1 side activates an application for skin photography to automatically shoot, or conversely, after the application is activated, Since the lens module 10 is turned on to turn on the LED 12 on the basis of this, the photographing is automatically performed after the lens module 10 is turned on, and communication between the lens module 10 and the smartphone 1 is not particularly required. It is possible to prevent the cost of the module 10 from increasing.

  In the above-mentioned server, the skin image data transmitted from the smartphone 1 is stored in the skin history database for each user of the smartphone 1, for example, so that the user can view it at any time, or can be used by a cosmetic manufacturer or the like. Can be considered. In this case, it has been necessary to register a texture image and a stain image (+ skin image) so far. On the other hand, in this skin image generation system for analysis, if one piece of skin image data is stored, image data for analysis of texture, stain, and skin color can be obtained at any time. Storage capacity can be reduced.

  It should be noted that the LED 12b is preferably installed at a single location so that the shadow of the unevenness becomes darker in obtaining image data for analyzing the texture that is the unevenness of the skin. Since the surface image is removed, it is preferable to have a plurality of locations in order to eliminate uneven illumination. When there are few illumination locations, illumination unevenness occurs in the captured image data, but the illumination unevenness can be eliminated by performing shading correction.

Next, an analysis skin image generation system and an analysis skin image generation method according to a second embodiment of the present invention will be described.
The skin image generation system for analysis of the second embodiment is the same as that of the first embodiment except for the LED and the polarizing plate that are illumination means, and the second embodiment shown in FIGS. 8 and 9. In the analysis image generation system of the embodiment, the same components as those in the first embodiment are denoted by the same reference numerals as those in FIGS. 1 and 2 and the description thereof is omitted.

As shown in FIGS. 8 and 9, the circuit board 13 is provided with an LED 12 a composed of one white LED, and the illumination light of the LED 12 a is irradiated to the subject via the first polarizing plate 15. ing.
Similarly to the first embodiment, the lens module 10 is provided with a second polarizing plate 16 between the conversion lens 11 and the master lens of the camera 2.

  That is, as shown in FIG. 11, the smartphone 1 includes a conversion lens 11 and illumination means a (LED 12 a) that emits illumination light including at least blue light and red light at the position of the camera 2. The lens module 10 is mounted, and the imaging unit c is configured by the conversion lens 11 and the camera 2.

The illumination means a of the lens module 10 is provided with a first polarizing plate 15, and a second polarizing plate 16 is provided at a position closer to the camera 2 than the conversion lens 11. The polarization directions of the first polarizing plate 15 and the second polarizing plate 15 are not parallel to each other nor orthogonal to each other, and are oblique. l
In addition, the smartphone 1 includes a storage unit d composed of a flash memory 4, and skin image data that is illuminated by the illumination unit a and photographed by the photographing unit c is temporarily stored in the storage unit d.

  In addition, the smartphone 1 includes a communication unit e, can be connected to the Internet f by connecting to a mobile communication network or a wireless LAN, and the skin image stored in the storage unit d described above. Data is transmitted to the data management server (server) g described above via the Internet f.

  As described above, the data management server g includes the control unit that functions as the communication unit i, the skin history database j, and the image processing unit k. The data management server g includes the image extraction unit m and the analysis determination unit n as described above.

  As shown in FIG. 4, the processed skin image data may be processed by the smartphone 1, and the smartphone 1 described above is in addition to the illumination unit a, the imaging unit c, and the storage unit d described above. Image processing means k, image extraction means m, and analysis determination means n. The data of the determination result by the analysis determination unit n is stored in the storage unit d in association with the skin image data used for the analysis.

  Further, the photographing means c is not only the camera 2 and the conversion lens 11 of the lens module 10 described above, but is a single skin camera 5 capable of photographing the skin as in the case of using the conversion lens 11. Also good. The skin camera 5 is capable of data communication with the smartphone 1 via a communication means such as USB, and the captured image data is transmitted from the skin camera to the smartphone 1 and stored in the storage means d. The Note that a storage device such as a flash memory may be provided on the skin camera side so that image data captured by the skin camera can be stored.

  In the first example, the first polarizing plate 15 and the second polarizing plate 16 have the polarization directions orthogonal to each other, but in the second embodiment, the polarization direction of the first polarizing plate 15. And the polarization direction of the second polarizing plate 16 is not perpendicular to each other, but is oblique to each other.

  That is, the polarization direction of the first polarizing plate 15 and the polarization direction of the second polarizing plate 16 are not perpendicular to each other or parallel to each other, but are oblique to each other. For example, when the angle of the polarization direction of the second polarizing plate 16 with respect to the polarization direction of the first polarizing plate 15 is within a range of, for example, 5 degrees to 85 degrees, the image data for spot analysis and the texture analysis are used as described later. The angle at which image data can be obtained. This angle is determined by, for example, experiments or simulations.

  Since the first polarizing plate 15 and the second polarizing plate 16 are inclined, the polarization direction of the light that has passed through the first polarizing plate 15 and reflected on the skin surface does not change as described above. Part of the light passes through the second polarizing plate 16 that is inclined with respect to the direction. On the other hand, the reflected light that has been transmitted through and reflected by the skin surface layer after passing through the first polarizing plate 15 has a random polarization direction due to multiple scattering in the skin surface layer as described above, and passes through the second polarizing plate. .

  Therefore, in the analysis skin image generation method of the analysis skin image generation system of the second embodiment, as shown in FIG. 10, the captured image data 36 captured by the camera 2 under the illumination of the LED 12c for illumination. In this case, a part of the image on the skin surface is cut, so that the image on the skin surface becomes thin, and the image of the spot is easier to see.

  In such photographed image data 36, as described above, the absorbance of melanin is higher as the wavelength is shorter. Therefore, by extracting the blue component image data, the image of the stain can be made darker, and the photographed image data can be obtained. The blue component image data 37 extracted from the data 36 can be used as image data for spot analysis.

  Further, when the red component image data 38 is extracted from the photographed image data 36, the red light has a low absorbance of the stain and the stain is displayed only thinly, so that it passes through the two polarizing plates 15 and 16 as described above. Even in the case of the image data 38 whose brightness has been lowered, the image of the skin surface texture can be obtained as the image of the skin surface is reduced by thinning the spot image. In this case, a spot image is included, but the original captured image data 36 may be used as texture analysis image data.

  Further, since the original photographed image data is illuminated by the LED 12c which is a white LED, it can be used for analysis of the skin color. It is necessary to adjust the white balance in the camera 2 before analyzing the skin color.

  In this skin image generation system for analysis, the angle between the polarization direction of the first polarizing plate 15 on the LED 12c illumination side and the polarization direction of the second polarizing plate 16 needs to be an appropriate angle. This angle is set during manufacturing. In this case, for example, image data of a blue component and image data of a red component are extracted using photographed image data photographed experimentally at a plurality of angles.

  Next, in the blue component image data, for example, in the range of angles formed by the two polarization directions described above, in which image data within an allowable range in which spot analysis is possible, and in the red component image data, for example, texture The polarization direction of the first polarizing plate 15 and the polarization direction of the second polarizing plate 16 are based on the range of angles formed by the above-described two polarization directions from which image data within an allowable range that can be analyzed is obtained. Determine the angle to make.

  According to such a skin image generation system for analysis, image data for analyzing a stain and an image for analyzing a texture are obtained by photographing the skin as a subject illuminated by one illumination unit once. Since the data and the image data for skin color analysis can be obtained, it is possible to easily shoot the skin for skin analysis.

  Based on the fact that it is possible to shoot skin spots, textures, and colors by a single shooting, the same effects as the analysis skin image generation system and the analysis skin image generation method of the first embodiment can be achieved. it can.

  In the first embodiment and the second embodiment, in order to obtain a high color balance such as white balance with high accuracy, for example, when the lens module 10 or the skin camera 5 is first used, that is, Take a reference white test chart attached to the skin camera only once after purchase, determine the correction value that makes the taken white image the reference white inside the smartphone or on the server side mentioned above, and flash memory 4 of the smartphone 1 Or any of the memory measures on the server side.

An appropriate skin image can be obtained by performing color correction on the photographed skin image using the above correction value during or after skin photographing.
Further, instead of the white test chart, a test chart on which a plurality of or single chromatic colors are printed may be used.

  In addition, the above-described test chart is provided within the photographing range of the lens module 10 and the skin camera 5, and the test chart is reflected in the photographed image, and the correction value is determined each time based on the reflected test chart. You may make it correct | amend the skin image image | photographed using the correction value.

1 Smartphone (portable electronic device)
2 Camera (photographing means)
3 Control device (image extraction means)
4 Flash memory (memory means)
10 Lens module 11 Conversion lens (photographing means)
11a Lens 11b Lens 12a LED (first illumination means)
12b LED (second illumination means)
12c LED (lighting means)
15 First polarizing plate 16 Second polarizing plate

Claims (12)

A skin image generation system for analysis that generates skin image data capable of analyzing skin spots and skin texture,
A first illumination means comprising: a light source that emits illumination light including at least blue light; and a first polarizing plate that polarizes illumination light emitted from the light source;
Second illumination means comprising a light source for irradiating illumination light including at least red light;
Photographing means for photographing the subject illuminated by both the first illumination means and the second illumination means via a second polarizing plate whose polarization direction is orthogonal to the first polarizing plate;
Storage means for storing image data of the subject photographed by the photographing means;
An analysis skin image generation system comprising: an image extraction unit that extracts blue component image data from the image data of the subject stored in the storage unit.   2. The analysis skin image generation system according to claim 1, wherein the image extraction unit extracts red component image data in addition to blue component image data from the image data of the subject.   The first illumination unit emits blue illumination light, and the second illumination unit emits illumination light having a wavelength range longer than blue emitted from the first illumination unit and appearing yellow. The analysis skin image generation system according to claim 1 or 2. The photographing means is composed of a camera mounted on a portable electronic device, and a skin photographing conversion lens provided in a lens module attached to the camera,
The said 1st illumination means which has the said 1st polarizing plate in the said lens module, the 2nd illumination means, and the said 2nd polarizing plate are provided, The any one of Claims 1-3 characterized by the above-mentioned. The skin image generation system for analysis according to item. A skin image generation system for analysis that generates skin image data capable of analyzing skin spots and skin texture,
An illumination means comprising: a light source that emits illumination light including at least blue light and red light; and a first polarizing plate that polarizes illumination light emitted from the light source;
A photographing means for photographing the subject illuminated by the illuminating means through a second polarizing plate relatively set in a polarization direction obliquely intersecting with a polarization direction of the first polarizing plate;
Storage means for storing image data of the subject photographed by the photographing means;
An analysis skin image generation system comprising: an image extraction unit that extracts blue component image data from the image data of the subject stored in the storage unit.   6. The analysis skin image generation system according to claim 5, wherein the image extraction means extracts red component image data in addition to blue component image data. The photographing means is composed of a camera mounted on a portable electronic device, and a skin photographing conversion lens provided in a lens module attached to the camera,
The analytical skin image generation system according to claim 5 or 6, wherein the illumination module includes a first polarizing plate in the lens module, and a second polarizing plate. A skin image generation method for analysis that generates skin image data capable of analyzing skin spots and skin texture,
Polarized light with respect to the first polarizing plate in a state where the subject is irradiated with two illumination lights including at least blue light and passing through the first polarizing plate and at least red light. An analysis skin image generation method, wherein blue component image data is extracted from image data obtained by photographing the subject through a second polarizing plate having orthogonal directions.   9. The analysis skin image generation method according to claim 8, wherein red component image data is extracted from the image data of the subject in addition to blue component image data.   One of the two illumination lights irradiated on the subject is blue illumination light, and the other illumination light is illumination light having a wavelength range in which the wavelength is longer than blue light and appears yellow. 10. The analysis skin image generation method according to claim 8, wherein the analysis skin image is generated. A skin image generation method for analysis that generates skin image data capable of analyzing skin spots and skin texture,
In a state where the subject is irradiated with illumination light including at least blue light and red light through the first polarizing plate that polarizes the light,
Image data of a blue component is extracted from image data obtained by photographing the subject through a second polarizing plate that is relatively set in a polarization direction that obliquely intersects the polarization direction of the first polarizing plate. A skin image generation method for analysis.   12. The analysis skin image generation method according to claim 11, wherein red component image data is extracted from the image data of the subject in addition to blue component image data.

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