CN208607145U - Moisture content of skin spectral measurement device based on cell phone platform - Google Patents
Moisture content of skin spectral measurement device based on cell phone platform Download PDFInfo
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- CN208607145U CN208607145U CN201820696563.2U CN201820696563U CN208607145U CN 208607145 U CN208607145 U CN 208607145U CN 201820696563 U CN201820696563 U CN 201820696563U CN 208607145 U CN208607145 U CN 208607145U
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Abstract
The utility model discloses a kind of moisture content of skin spectral measurement device based on cell phone platform, the device includes mobile lens lens, mirror holder, four color filter coatings, mobile phone cmos image sensor and wiring board, the upper end of mirror holder is arranged in the mobile lens lens, mobile phone cmos image sensor and wiring board are successively set on the lower end of mirror holder, and the four colors filter coating is arranged between mobile lens lens and mobile phone cmos image sensor.The utility model is to be mapped on skin that diffusing reflection occurs by mobile phone flashlight or ambient lighting, it is received by mobile lens, after the light splitting of four color filter coatings, it forms monochromatic light and is input to mobile phone cmos image sensor, obtain human skin image information, image information is subjected to data processing again, skin surface absorption spectra data information corresponding with image information is obtained, skin moisture content is calculated；This spectral measurement device has image resolution ratio height, multispectral capacity usage ratio height and the advantage that can be integrated with mobile phone camera.
Description
Technical field
The utility model relates to spectral detections and medical domain, and in particular to a kind of moisture content of skin based on cell phone platform
Spectral measurement device.
Background technique
With popularizing for smart phone, it is to move that human body physiological parameter measurement function, which is embedded into the Intelligent mobile equipments such as mobile phone,
Move the development trend of health.Skin is the important barrier of human body, and moisture of skin has important meaning for protection human body and skin,
In order to improve the aqueous degree of skin, various moisturizing class cosmetics come into being.The measurement of moisture content of skin can be used as evaluation
The important parameter of human health status and moisturizing class product function and effect.On the one hand be based on spectral technique passes through reality to the utility model
Test amount and data calculate the measurement method carried out and determine human skin moisture.On the other hand interior by hardware Miniaturization Design
The spectra collection system being placed in mobile phone.
Currently, having the utility model of publication number CN105380646A special with prior art similar in technical scheme
Benefit discloses a kind of human skin MOISTURE MEASUREMENT SYSTEM and method, utilizes the human skin capacitance measurement side of pulse signal excitation
Method, the utility model patent of publication number CN204318756U disclose a kind of bluetooth skin moisture detector, are based on bioelectricity
Impedance principle detects moisture content of skin, and above two method belongs to contact type measurement, the disadvantage is that can generate shadow to human skin
It rings, in addition has significant reaction to the large change of moisture, it is then helpless to slow and minor change.
The utility model patent of publication number CN104535526A discloses a kind of based on the linear of microcomputer Edison
Gradual filter formula hand-held intelligent spectrometer, it is single to solve detection function existing for existing near infrared spectrometer, can not detect
The problem of complete spectrum.Analog signal is converted into digital data transmission to microcomputer through analog-digital converter by the spectrometer
Edison, microcomputer Edison are analyzed and processed digital signal to obtain spectroscopic data, microcomputer Edison fortune
With WIFI module and network connection, spectroscopic data is uploaded to network data base.This optical system is although small in size, light-weight, but
It can't realize and be integrated in mobile phone.
Utility model content
The purpose of the utility model is to overcome the deficiencies in the prior art, and it is aqueous to propose a kind of skin based on cell phone platform
Spectral measurement device is measured, the spectral measurement device structure is simple, compact, by the ingehious design of structure, saves conventional spectrometers
The object lens such as collimation, calibration and the focusing of middle use keep spectrometer outer dimension small, and high resolution, and spectrographic detection range is wide, can
Realization is integrated in mobile phone.
Purpose of the utility model is realized as follows: a kind of moisture content of skin spectral measurement side based on cell phone platform
Method, the device include mobile lens lens, mirror holder, four color filter coatings, mobile phone cmos image sensor and wiring board, the mobile phone
The upper end of mirror holder is arranged in stationary lens, and mobile phone cmos image sensor and wiring board are successively set on the lower end of mirror holder, described
Four color filter coatings are arranged between mobile lens lens and mobile phone cmos image sensor.
The four colors filter coating is the beam splitting system being integrated in mobile lens group, and four color filter coatings are by blue wave band, green
Optical band, red spectral band and near infrared band light-transmissive film are constituted, the equal in magnitude and and mobile phone of different-waveband light transmission film unit
The pixel dimension of cmos image sensor is equal, and the positional relationship of four kinds of wave band light transmission film units is: upper left white is near-infrared
Light-transmissive film, upper right red are feux rouges light-transmissive films, and lower-left blue is blue light light-transmissive film, and bottom right green is green light light-transmissive film, four face
Color constitutes one group of repetitive unit, and four color filter coating repetitive units as multiple groups are constituted.
Wherein, mobile lens lens diffuse skin surface coupling, and are transmitted to mobile lens optical outlet, mirror holder
For fixing lens and four color filter coatings, monochromatic light of the detection light after the light splitting of four color filter coatings is input to mobile phone cmos image
Sensor obtains human skin image information.To skin image at different-waveband (blue and green light, feux rouges and near infrared band)
Brightness value extract, use brightness value as the light intensity value of corresponding wave band, that is, obtain spectrum corresponding with image information and believe
It ceases (color and brightness value respectively correspond wave band and light intensity value in spectrum in image).It calls calculation formula and calculates skin surface
Water content (image procossing, moisture content calculating process and calculated result, which are shown, to be realized in subsequent development mobile phone A pp).
The utility model principle: it is described in the utility model based on spectral technique detection moisture content of skin measuring principle be
The absorption peak of skin and water is at identical wave band, but skin histology other compositions for visible and near-infrared radiation absorption compared with
Weak and absorption coefficient is identical, and moisture is widely different for the visible and near infrared band absorption coefficient of light, as shown in Figure 5.This
Skin moisture content, which is detected, for difference spectrum method provides theoretical foundation.Skin surface is projected by reflection spectrometry to detect
Diffusing reflection spectrum, skin spectrum characteristic information is obtained from spectrum.Measuring device utilizes mobile phone flashlight or ambient lighting
Skin surface is penetrated, then will carry the optical coupling of skin surface material information into mobile lens lens, then through four color filter coatings
After light splitting, it is incident at mobile phone cmos image sensor image planes, obtains skin surface image information.To skin image in different waves
The brightness value of section (blue and green light, feux rouges and near infrared band) extracts, and uses brightness value as the luminous intensity of corresponding wave band
Value, that is, obtaining spectral information corresponding with image information, (color and brightness value respectively correspond wave band and light in spectrum in image
Intensity values), then moisture content of skin is obtained through Difference Calculation.
The utility model has the following beneficial effects:
1, the utility model is based on spectrum detection technique, belongs to non-contact detecting, to human zero damage.
2, the advantages of the utility model is based on spectral technique, contains image information and spectral information is examined but also with spectrum
The characteristics of surveying high sensitivity can complete, it can be achieved that from the detection of visible near infrared spectrum wavelength band to moisture content of skin
Detection.
3, the utility model detection method is simple to operate, and the foundation with Relational database can promote actually detected speed
The accuracy of degree and testing result.
4, the utility model avoids the preposition beam path alignment of conventional optical systems using four color filter coatings as beam splitting system
System keeps optical system structure more compact, and realization is integrated in mobile phone.
5, provided by the utility model to be based on cell phone platform moisture content of skin measuring device, there is image resolution ratio height, it is more
Spectral energy utilization rate height and the advantage that can be integrated with mobile phone camera.
Detailed description of the invention
Fig. 1 is the spectra collection apparatus structure decomposition diagram that the utility model is integrated in mobile phone.
Fig. 2 is the spectra collection apparatus structure cut-away view that the utility model is integrated in mobile phone.
Fig. 3 is one group of repeat unit structure schematic diagram that four color light-transmissive films of the utility model are constituted.
Fig. 4 is the four color optical filtering membrane structure diagrams that the utility model multiple groups repetitive unit is constituted.
Fig. 5 is the utility model spectroscopy measurement moisture content of skin measurement method process flow chart.
Fig. 6 is absorption coefficient figure of the utility model water in Visible-to-Near InfaRed wave band.
Specific embodiment
As shown in attached drawing 1,2: the device includes mobile lens lens 1, mirror holder 2, four color filter coatings 3, mobile phone cmos image
The upper end of mirror holder 2, mobile phone cmos image sensor 4 and route is arranged in sensor 4 and wiring board 5, the mobile lens lens 1
Plate 5 is successively set on the lower end of mirror holder 2.The setting of four colors filter coating 3 is sensed in mobile lens lens 1 and mobile phone cmos image
Between device 4.
As shown in attached drawing 3,4: the four colors filter coating 3 is the beam splitting system being integrated in mobile lens group, it is by blue light
Wave band (400-520nm), green light band (520-600nm), red spectral band (600nm-730nm) and near infrared band (730-
900nm) light-transmissive film is constituted, the pixel ruler equal in magnitude and with mobile phone cmos image sensor of different-waveband light transmission film unit
It is very little equal, the locations of structures relationships of four kinds of different-waveband light transmission film units as shown in figure 3, upper left white is near-infrared light-transmissive film,
Upper right red is feux rouges light-transmissive film, and lower-left blue is blue light light-transmissive film, and bottom right green is green light light-transmissive film, and four colors constitute one
Group repetitive unit, four color filter coatings are constituted by much organizing such repetitive unit；Described image sensor 4 is general mobile phone Central Plains
There are cmos sensor, service band 400nm-900nm.
The reflected light of skin surface to be measured is coupled to four color filter coatings 3 through mobile phone stationary lens 1, by four color filter coatings 3
Light beam to mobile phone cmos image sensor 4 after light splitting forms picture signal, by red, green, blue in image and near-infrared wave
The brightness value of section extracts, and uses brightness value as the light intensity value of corresponding wave band, using calculus of finite differences by calculation formula (1.9) and
(1.10) moisture content of skin surface to be measured is calculated；Four color filter coatings 3 described in present embodiment are used as beam splitting system, keep away
The preposition beam path alignment system of conventional optical systems is exempted from, has kept optical system structure more compact, realization is integrated in mobile phone.
Shown in attached drawing 5: spectroscopy measurement moisture content of skin measurement method, comprising the following steps:
(1), unknown water content skin surface photo is acquired.Light source is irradiated into skin to be measured (face or the back of the hand) surface, skin
What skin surface occurred diffuses after mobile lens, then after the light splitting of four color filter coatings, is irradiated to mobile phone cmos image sensing
Device imaging；
(2), using skin surface photo, it is bright in red, green, blue and near infrared band that region to be measured is extracted from image information
Angle value uses this brightness value as the light intensity value in red, green, blue and near-infrared four-band multispectral data.
(3), moisture content of skin is calculated using calculus of finite differences.For moisture in four wave bands of red, green, blue three primary colours and near-infrared
Light absorption degree it is different, red, green, blue three primary colours and near infrared band light intensity value are done by Difference Calculation using difference spectrum method,
Skin moisture content is calculated, circular is as follows:
According to langbobier law I0(λ)=Ii(λ)×F(λ)+Ii(λ)e(-δ(λ)C·L) (1.1)
Each expressed as parameters in formula is as follows: I0(λ)To detect light light intensity；Ii(λ)For light intensity of incident light；C is that skin is aqueous
Amount, L are the depth that light can penetrate into skin, and δ (λ) is the absorption coefficient in af at wavelength lambda, F(λ)For surface spectrum reflection
Rate；
Four band receptions of red, green, blue and near-infrared to light intensity be all satisfied langbobier law so that
Red spectral band light intensity I0(R)=Ii(λ)×F(R)+Ii(λ)e(-δ(R)·C·L) (1.2)
Green light band light intensity I0(G)=Ii(λ)×F(G)+Ii(λ)e(-δ(G)·C·L) (1.3)
Blue wave band light intensity I0(B)=Ii(λ)×F(B)+Ii(λ)e(-δ(B)·C·L) (1.4)
Near infrared band light intensity I0(IR)=Ii(λ)×F(IR)+Ii(λ)e(-δ(IR)·C·L) (1.5)
Due to the design feature of skin, reflection of the skin surface to red, green, blue and near infrared band light can be approximately considered
Rate is equal, i.e. F(R)≈F(G)≈F(B)≈F(IR), red, green, blue three primary colours are made into difference near infrared band respectively, can be filtered out
The influence of reflected light, calculation formula are as follows:
It is obtained by formula (1.6) and (1.7):
It is obtained by formula (1.6) and (1.8):
C and L on the right of equation (1.9) and equation (1.10) are unknown number, other parameters I0(λ)It is datum with δ (λ),
Two equations, two unknown numbers, equation can solve, and the C solved is moisture content of skin.
Claims (2)
1. a kind of moisture content of skin spectral measurement device based on cell phone platform, it is characterised in that: the device includes mobile lens
Lens (1), mirror holder (2), four color filter coatings (3), mobile phone cmos image sensor (4) and wiring board (5)；The mobile lens are saturating
Mirror (1), which is arranged, is successively set on mirror holder (2) in the upper end of mirror holder (2), mobile phone cmos image sensor (4) and wiring board (5)
Lower end, the four colors filter coating (3) are arranged between mobile lens lens (1) and mobile phone cmos image sensor (4).
2. a kind of moisture content of skin spectral measurement device based on cell phone platform according to claim 1, it is characterised in that:
The four colors filter coating (3) is the beam splitting system being integrated in mobile lens group, and four color filter coatings (3) are by blue wave band, green light
Wave band, red spectral band and near infrared band light-transmissive film are constituted, the equal in magnitude and and mobile phone of different-waveband light transmission film unit
The pixel dimension of cmos image sensor is equal, and the positional relationship of four kinds of wave band light transmission film units is: upper left white is near-infrared
Light-transmissive film, upper right red are feux rouges light-transmissive films, and lower-left blue is blue light light-transmissive film, and bottom right green is green light light-transmissive film, four face
Color constitutes one group of repetitive unit, and four color filter coating repetitive units as multiple groups are constituted.
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