CN102567707B - Biometric sensor and biological recognition system - Google Patents
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Abstract
The invention provides a kind of biometric sensor and biological recognition system, wherein biological identification sensor includes: launch visible ray and the active light source of near infrared light, single imaging lens, light splitting part, infrared image acquisition device and visible images harvester；Described light splitting part is positioned at the rear of described imaging lens, and described infrared image acquisition device and visible images harvester are respectively positioned on the rear of described light splitting part；Wherein, described light splitting part, for being divided into a road visible ray and a road near infrared light by the light wave from described imaging lens transmission.The biometric sensor that the present invention provides not only achieves non-contact image collection, and utilizes light splitting part to simplify the structure of image collecting device, is effectively increased precision and the efficiency of bio-identification.
Description
Technical field
The present invention relates to the use of biological characteristic and carry out identity identification technical field, especially, relate to a kind of biological
Identify sensor and biological recognition system.
Background technology
In recent years, identity recognizing technology based on biological characteristic is increasingly subject to people's attention.Based on biology
The identity recognizing technology of feature is called for short biological identification technology.So-called biological identification technology refer to utilize human body or its
The physical features that allogene body itself is intrinsic, such as: fingerprint, palmmprint, iris, face etc., or row
It is characterized, such as: sound, handwritten signature, gait etc., is come by the method such as image procossing, pattern recognition
Differentiate the technology of organism identity.Compared with traditional identification mode based on password or ID card, have
The property carried with is strong, be difficult to forget, be difficult to the advantages such as forgery, safety, reliability and effectiveness be higher.
As a example by human body identification, prior art Publication No.: the patent application of CN 101196987A is public
A kind of online palmprint, palm vein image personal identification method and special-purpose collection instrument thereof are opened.
This technology uses the palmmprint of human body and palm vein biological characteristic as the means of identification.Palmmprint and
The acquisition of palm vein information data is the basis of this biological identification technology, prior art use palmmprint and
Palm vein image obtain equipment include: in order to formed the instrument box of darkroom structure, DV,
Near-infrared light source, visible light source, scattering sheet, instrument support, tool housing and palm casing.Data acquisition
Process includes log-on message gatherer process and identification procedure.Wherein, log-on message gatherer process is: will
Palm is placed on the camera bellows being made up of palm casing and instrument box, obtains visible light source with digital camera and shines
Palmprint image under penetrating and the palm vein image under Infrared irradiation, will reflect the not syngenesis of same organism
Two width images of thing feature are as log-on message.Identification procedure is: the palmmprint of collection in worksite human body and hands
Vena metacarpea image, then Land use models identification technology and registered two width image comparison, by both checkings
Relatedness realize the authentication of organism.
Although using above-mentioned palmmprint and palm vein to carry out human body identification have higher safety with correct
Discrimination, but prior art has the disadvantage in that
1, image acquisition process uses the way of contact, it is easy to cause bacterial cross-infection, the safety of organism
Health cannot ensure；
2, palmprint image and the asynchronous acquisition of palm vein image, need continuous toggle lights, reduce image
Collecting efficiency；
3, owing to needing to realize the switching of visible light source and infrared light supply, so data acquisition equipment also needs to increase
Light source conversion equipment, adds the complexity of data acquisition equipment, improves the production cost of equipment.
Summary of the invention
The technical problem to be solved is to provide a kind of biometric sensor and biological recognition system,
Cordless can be used to collect visible images and the reflection of reflection organism surface textural characteristics simultaneously
The infrared vein image of the subcutaneous vein pattern of organism surface, for organism authentication.
In order to solve the problems referred to above, on the one hand provide a kind of biometric sensor, including: launch visible
Light and the active light source of near infrared light, single imaging lens, light splitting part, infrared image acquisition device and can
See light image harvester；Above-mentioned light splitting part is positioned at the rear of above-mentioned imaging lens, and above-mentioned infrared image is adopted
Acquisition means and visible images harvester are respectively positioned on the rear of above-mentioned light splitting part；Wherein, above-mentioned active light
Source, for irradiating above above-mentioned imaging lens or the image acquisition region in front；Above-mentioned imaging lens, is used for
Receive the light wave reflected from the organism of above-mentioned image acquisition region；Above-mentioned light splitting part, being used for will be from above-mentioned
The light wave of imaging lens transmission is divided into a road visible ray and a road near infrared light；Above-mentioned infrared image acquisition device,
For gathering after above-mentioned light splitting part light splitting, the near-infrared light waves of outgoing, reflect above-mentioned organism to be formed
The infrared vein image of vein pattern；Above-mentioned visible images harvester, for gathering through above-mentioned spectrum part
After part light splitting, the visible light wave of outgoing, with formed reflect above-mentioned organism appearance textural characteristics body surface texture
Image.
Preferably, above-mentioned light splitting part is specially the middle Amici prism being coated with particular optical thin layer, above-mentioned
Particular optical thin layer transmission visible ray, reflection near infrared light, or reflection visible ray, transmission near infrared light.
Preferably, above-mentioned light splitting part specially two surface is coated with infrared filtering thin film respectively and visible ray filters
The Amici prism of thin film.
Preferably, above-mentioned light splitting part be specially Amici prism, near-infrared band pass filter, visible band lead to
The combination of filter plate；Wherein, above-mentioned near-infrared band pass filter is placed in above-mentioned Amici prism and above-mentioned infrared figure
As between harvester；Above-mentioned visible ray band pass filter is placed in above-mentioned Amici prism and above-mentioned visible images
Between harvester.
Preferably, above-mentioned light splitting part is specially light splitting piece, near-infrared band pass filter, the logical filter of visible band
The combination of wave plate；Wherein, above-mentioned near-infrared band pass filter is placed in above-mentioned light splitting piece and adopts with above-mentioned infrared image
Between acquisition means；Above-mentioned visible ray band pass filter is placed in above-mentioned light splitting piece and fills with above-mentioned visible images collection
Between putting.
Preferably, above-mentioned biometric sensor also includes: infrared proximity induction apparatus, with above-mentioned active light source,
Image collecting device connects, when above-mentioned organism enters the image acquisition areas away from above-mentioned imaging lens predeterminable range
During territory, trigger above-mentioned active light source and or above-mentioned image collecting device work.
Preferably, above-mentioned biometric sensor may further comprise: light guide ring, is arranged at above-mentioned active light
The top in source.
Preferably, above-mentioned predeterminable range is specially 5～10 centimeters.
Preferably, the wave-length coverage of above-mentioned near infrared light is 760nm～940nm.
On the other hand, present invention also offers a kind of biological recognition system, including: arbitrary above-mentioned bio-identification
Sensor, for gathering infrared vein image and the body surface texture image of organism；Data Transmission Control Unit,
It is connected with above-mentioned biometric sensor, for by the body surface texture image of above-mentioned organism and infrared vein figure
As sending to data processing equipment；Data processing equipment, is connected with above-mentioned Data Transmission Control Unit, and being used for will
Body surface texture image and the infrared vein image of above-mentioned organism carry out pretreatment and feature extraction, and protect in advance
The sample deposited carries out Characteristic Contrast, it is achieved identification.
Compared with prior art, a technical scheme in technique scheme has the following advantages or useful effect
Really:
When the biosensor using the present invention to provide carries out biometric image collection, when organism enters pre-
If image acquisition region, active light source launches visible ray and near infrared light in organism simultaneously, biological
Reflection light or the transmission light of body will transmit through the light wave of imaging lens by single imaging lens imaging, light splitting part
It is divided into a road visible light wave and a road near-infrared light waves, is respectively used to the image letter of organism surface textural characteristics
Breath gathers and the infrared image acquisition of organism vein pattern.Visible, that the present invention provides bio-identification sensing
Device not only achieves non-contact image collection, and utilizes light splitting part, by single imaging lens
Realize collection and the collection of organism vein pattern infrared image of organism surface texture visible images, letter
Change the structure of image collecting device, and two width living body feature images can have been obtained simultaneously, be effectively improved
The efficiency of bio-identification.
Accompanying drawing explanation
Fig. 1 is the structural representation of biometric sensor embodiment of the present invention；
Fig. 2 is the structural representation of biometric sensor embodiment two of the present invention；
Fig. 3 is the schematic diagram of biometric sensor light splitting part embodiment one of the present invention；
Fig. 4 is the schematic diagram of biometric sensor light splitting part embodiment two of the present invention；
Fig. 5 is the schematic diagram of biometric sensor light splitting part embodiment three of the present invention；
Fig. 6 is the schematic diagram of biometric sensor light splitting part embodiment four of the present invention；
Fig. 7 is the schematic diagram of biological recognition system embodiment of the present invention.
Detailed description of the invention
Understandable for enabling the above-mentioned purpose of the present invention, feature and advantage to become apparent from, below in conjunction with the accompanying drawings and
The present invention is further detailed explanation for detailed description of the invention.
With reference to Fig. 1, it is shown that the structural representation of biometric sensor embodiment of the present invention, including: actively
Light source 1, single imaging lens 2, light splitting part 3, infrared image acquisition device 4, visible images collection
Device 5.Wherein, active light source 1 is placed in the lower section of imaging lens 2, is used for providing uniform irradiation image acquisition
The light wave in region.Light splitting part 3 is positioned at the lower section of imaging lens 1, infrared image acquisition device 4 and visible
Light image harvester 5 is respectively positioned on the rear of light splitting part 3.In order to preferably gather image, can be by infrared
The center of image collecting device and visible images harvester photo-sensitive cell respectively with the two of light splitting part
The center of exit facet is the most corresponding.
Wherein, near-infrared light waves and the wavelength of a length of 760nm～1000nm of active light source 1 transmitted wave is
The visible light wave of 390nm～760nm, irradiates the image acquisition region being positioned at imaging lens front or top,
When organism enters image acquisition region, act on organism, such as human body palm etc..
Active light source 1 can be specifically spaced near-infrared luminous element and the group of visible ray light-emitting component
Close, such as the LED launching near infrared light of annular array with launch the array of LED of white light.Active light
Source 1 can be specially the light-emitting component etc. that emission band is 390nm～1000nm light wave.
Wherein, the visible light wave that active light source 1 is launched, it is mainly used in providing steady for the texture of organism surface
Fixed illumination condition.Imaging lens is entered, to form reflection after being irradiated in the visible reflectance of organism surface
The body surface texture image of organism appearance textural characteristics.
The near-infrared light waves that active light source 1 is launched, is mainly used in providing stable light for organism venae subcutaneae
According to condition.Imaging lens is entered, to form reflection after being irradiated in the near infrared light reflection of organism venae subcutaneae
The infrared vein image of organism vein pattern.
Wherein, the principle of organism venae subcutaneae infrared imaging is: medical research shows, wavelength exists
The light wave in the near infrared spectrum district of 760nm～1000nm has stronger penetration capacity to tissue.Human vein
HbO2 Oxyhemoglobin in blood and reduced hemoglobin are to the suction of light wave in 760nm～1000nm wave-length coverage
Yield is of a relatively high, and the water in tissue is relatively low to the absorbance of light wave in this wave-length coverage.
So, under the irradiation of near-infrared light source, human vein part can be because having more absorption to light, instead
Injection light less and in dead color, simultaneously other histiocyte of human body due to water reflection and in light tone, so
Can be obtained by reflecting the infrared vein image of organism venae subcutaneae feature.
According to above-mentioned venae subcutaneae infrared imaging principle and through lot of experiment validation, launch
The infrared LED array of 850nm～940nm, especially 890nm, as infrared light supply, can obtain more clear
Clear infrared vein image.
Imaging lens 2, for receiving the reflection light of organism, forms the light beam zoomed in or out, to form contracting
Image that is little or that amplify.
As a example by palmmprint and vein image acquisition, the typically light wave through imaging lens forms the light beam reduced,
To form visible images and the infrared figure of reflection palm vein feature of the reflection palm textural characteristics reduced
Picture.
Light splitting part 3, is divided into a road near-infrared light waves and a road for will transmit through the light wave of single imaging lens 2
Visible light wave.Wherein, near-infrared light waves mainly carries the information of organism venae subcutaneae.Visible light wave master
The information of organism surface texture to be carry.
Infrared light image harvester 4, for sensing from the near-infrared light waves of light splitting part 3 outgoing, is formed anti-
Reflect the infrared vein image of organism vein pattern.
Visible images harvester 5, for sensing from the visible light wave of light splitting part 3 outgoing, forms reflection
The body surface texture image of organism appearance textural characteristics.
Above-mentioned image collecting device can be CCD induction apparatus (Charge Coupled Device, Charged Couple
Device), it is also possible to be CMOS induction apparatus (Complementary Metal-Oxide Semiconductor,
Complementary metal oxide semiconductors (CMOS) sensor).
Below as a example by gathering human body palm feature, the worked of above-mentioned biometric sensor embodiment is described
Journey:
S1, staff extend into image acquisition region, i.e. the top of Range Imaging camera lens 3 certain distance or front
Orientation is put.
S2, active light source 1 launch near-infrared light waves and visible light wave, irradiate staff simultaneously.
Near-infrared light waves and the visible light wave of the reflection of S3, staff enter imaging lens 2.
S4, light wave from imaging lens 2 outgoing incide light splitting part 3, and the parts 3 that are split are divided into one
Road near-infrared light waves and a road visible light wave.
S5, near-infrared light waves from light splitting part 3 outgoing act on infrared image acquisition device 4, form palm
Vein image.
S6, visible light wave from light splitting part 3 outgoing act on visible images harvester 5, form palm
Texture image.
Knowable to the work process of above-mentioned biosensor, because there being the light splitting effect of light splitting part 3, utilize
One imaging lens 2 just can realize palm texture information and the uncorrelated life of palm vein information the two simultaneously
The collection of thing information, it is to avoid two width images use different optical lens collections or use an optical lens
Constantly toggle lights is acquired, and is effectively simplified the structure of biosensor, has saved image acquisition time,
Improve image acquisition efficiency.
Further, since this biometric sensor uses non-contact image collection, it is to avoid different organisms
Leave over the cross infection of antibacterial, the safe and sanitary of organism has been effectively ensured.
With reference to Fig. 2, it is shown that the structural representation of biometric sensor embodiment two of the present invention, with enforcement one
Compare, also include: a light guide ring being arranged at above active light source 16, be used for making active light source 1 launch
Light homogenization.
In another embodiment, it is additionally provided with infrared proximity induction apparatus 7, with active light source 1, image collector
Put 4 and 5 connections, when organism enters the image acquisition region away from imaging lens 2 predeterminable range, trigger
Active light source 1 and or image collecting device 4 and 5 work.
The predeterminable range of above-mentioned image acquisition region can be, but not limited to be set to above Range Imaging camera lens 5～10
The region of centimetre.When organism enters image acquisition region, owing to human body reflects infrared waves, so can
To trigger the switch of infrared proximity induction apparatus 7.
Infrared proximity transducer 7 can be, but not limited to the proximity transducer using infrared reflection to form pipe,
When such as palm is above camera lens for organism, system start-up starts image acquisition and identification, is connect by this
Nearly sensor can make system keep low power consumpting state when not working, not only using electricity wisely but also guarantee section device
Service life, avoid the problems such as the visible light source ophthalmic uncomfortable crossing bright band simultaneously.
Detailed description of the invention below in conjunction with the specific embodiment explanation light splitting part of light splitting part:
Light splitting part embodiment one
With reference to Fig. 3, it is shown that the schematic diagram of biometric sensor light splitting part embodiment one of the present invention, such as figure
Shown in 3-a, specially one intermediate layer of light splitting part is coated with the Amici prism 3-1 of particular optical thin film c, its
In, the plated film c in intermediate layer can be with transmission visible ray, reflection Infrared.Certainly, above-mentioned intermediate coated film c
Can also be transmission near infrared light, the optical thin film of reflection visible ray.
Seeing the light splitting schematic diagram of the Amici prism shown in Fig. 3-b, the spectroscopic processes of Amici prism 3-1 is: from
(wherein, λ 1 represents near-infrared light waves, and λ 2 represents for the visible ray of imaging lens 2 outgoing and infrared light λ 1+ λ 2
Visible light wave), together enter from the plane of incidence of Amici prism 3-1, acted on by intermediate coated film layer c, making can
Seeing light wave λ 2 transmission of optical band, the light wave λ 1 of near infrared band reflects.It should be noted that transmission light
Ripple λ 2 only carries organism surface textural characteristics, and reflecting light λ 1 only carries organism venae subcutaneae information.
Infrared light image harvester 4 receives reflecting light λ 1, collects organism infrared vein image；Can
See that light image harvester 5 receives transmitted light wave λ 2, collect organism surface texture image.
Light splitting part embodiment two,
See Fig. 4, it is shown that the schematic diagram of biometric sensor light splitting part embodiment two of the present invention, such as figure
Shown in 4-a, a light splitting part specially surface is coated with visible band pass filter thin film a, and another surface is coated with closely
The Amici prism 3-2 of infrared bandpass filtering thin film b.
Seeing the light splitting schematic diagram of the Amici prism 3-2 shown in Fig. 4-b, the spectroscopic processes of Amici prism 3-2 is:
From the visible ray of imaging lens 2 outgoing and infrared light λ 1+ λ 2, (wherein, λ 1 represents near-infrared light waves, λ 2 generation
Table visible light wave), together enter from the plane of incidence of Amici prism 3-2, be divided into road reflection light and a Reuter
Penetrate light.Wherein, transmission light is led to light filter film a at exit facet by visible band and filters, and formation only comprises visible
The emergent light of optical band λ 2.Reflection light is filtered by near-infrared bandpass filter thin film b at exit facet, is formed and only wraps
Emergent light containing near infrared band λ 1.Above-mentioned transmitted light wave λ 2 only carries organism surface textural characteristics,
Reflecting light λ 1 only carries organism venae subcutaneae information.
Infrared light image harvester 4 receives reflecting light λ 1, collects organism infrared vein image；Can
See that light image harvester 5 receives transmitted light wave λ 2, collect organism surface texture image.
Light splitting part embodiment three,
See Fig. 5, it is shown that the schematic diagram of biometric sensor light splitting part embodiment three of the present invention, such as figure
Shown in 5-a, light splitting part can also be by a common Amici prism 3-3, a near-infrared band pass filter
8-1, the combiner of a visible ray band pass filter 8-2 composition.Wherein, near-infrared band pass filter 8-1
It is placed between Amici prism 3-3 and infrared image acquisition device 4；Visible ray band pass filter 8-2 is placed in light splitting
Between prism 3-3 and visible images harvester 5.
Seeing the schematic diagram of the light splitting part shown in Fig. 5-b, its spectroscopic processes is divided with light splitting part embodiment two
Photoreduction process is similar to, and the present embodiment is equivalent to two kinds of plated films in above-described embodiment two by the logical filter of two independent bands
Wave plate 8-1,8-2 replace.Wherein, near-infrared band pass filter 8-1 be placed in Amici prism 3-3 reflecting surface and
Between infrared light image harvester 4.Visible ray band pass filter 8-2 is placed in the transmission plane of Amici prism 3-3
And between visible images harvester 5.
Concrete spectroscopic processes is: from visible ray and infrared light λ 1+ λ 2 (wherein, λ 1 of imaging lens 2 outgoing
Representing near-infrared light waves, λ 2 represents visible light wave), together enter from the plane of incidence of Amici prism 3-3, divided
Light is penetrated by Cheng Yilu reflection light and a Reuter.Herein, the two-beam separated through Amici prism 3-3 remains simultaneously
Comprise visible light wave λ 2 and the light wave of near-infrared light waves λ 1.From the light wave of Amici prism 3-3 transmission through
After light band pass filter 8-2 filtering, the light wave of outgoing is only carry organism surface textural characteristics visible
Light wave λ 2.Amici prism 3-3 reflection light wave through near infrared light band pass filter 8-1 filter after, outgoing
Light wave be near-infrared light waves λ 1 only carrying organism venae subcutaneae information.
Infrared light image harvester 4 receives reflecting light λ 1, collects organism infrared vein image；Can
See that light image harvester 5 receives transmitted light wave λ 2, collect organism surface texture image.
Light splitting part embodiment four,
See Fig. 6, it is shown that the schematic diagram of biometric sensor light splitting part embodiment four of the present invention, such as figure
Shown in 6-a, light splitting part can also be by a light splitting piece 3-4, near-infrared band pass filter 8-1, one
The combiner of individual visible ray band pass filter 8-2 composition.Wherein, near-infrared band pass filter 8-1 is placed in point
Between reflecting surface and the infrared image acquisition device 4 of mating plate；Visible ray band pass filter 8-2 is placed in light splitting piece
Between transmission plane and the visible images harvester 5 of 3-4.
The present embodiment four and the structure proximate of embodiment three, be simply coated with semi-transparent half by Amici prism 3-3 with one
The all band light splitting piece 3-4 of anti-film replaces.Its spectroscopic processes is similar to embodiment three, sees shown in Fig. 6-b,
Here is omitted.
In addition, the present invention may be used without other optical element such as two become certain angle reflecting mirror,
Near-infrared band pass filter and visible ray band pass filter composition light splitting part, the present invention is to its way of realization not
It is restricted.
From the implementation of above-mentioned light splitting part, biometric sensor simple in construction that the present invention provides,
It is convenient to realize, and can effectively reduce the production cost of biometric sensor.
Accordingly, present invention also offers a kind of biological recognition system, with reference to the bio-identification system shown in Fig. 7
The structural representation of system, this biological recognition system includes:
Biometric sensor 71 described in any of the above-described embodiment, for gathering the infrared vein figure of organism
Picture and body surface texture image.
Data transmission device 72, is connected with above-mentioned biometric sensor 71, for by the body surface stricture of vagina of organism
Reason image and infrared vein image send to data processing equipment 73；
Data processing equipment 73, is connected with data transmission device 72, for by the body surface texture image of organism
Carry out pretreatment and feature extraction with infrared vein image, carry out Characteristic Contrast with the sample pre-saved, real
Existing identification.
Wherein, biometric sensor 71 is mainly used in the original image required for captured identity identification, including
The original image of the registration phase i.e. collection of sample, also includes the suitable of authenticating phase organism original image
Time gather.
Above-mentioned biological recognition system uses contactless acquisition mode, has safety and sanitation, easy to use, with
And feature fast and accurately.This system obtains the biology of human body palm by the way of non-contact image gathers
Feature, has noninvasive, not damages the health of human body, it is adaptable to gate inhibition, work attendance, clearance, PC
The places such as machine login, network ID authentication.
Each embodiment in this specification all uses the mode gone forward one by one to describe, and each embodiment stresses
Being all the difference with other embodiments, between each embodiment, identical similar part sees mutually.
For system embodiment, owing to it includes device embodiment, so describe is fairly simple, it is correlated with it
Place sees the part of device embodiment and illustrates.
Above to a kind of biometric sensor provided by the present invention, and a kind of biological recognition system, enter
Having gone and be discussed in detail, principle and the embodiment of the present invention are set forth by specific case used herein,
The explanation of above example is only intended to help to understand method and the core concept thereof of the present invention；Simultaneously for
One of ordinary skill in the art, according to the thought of the present invention, the most all
Will change, in sum, this specification content should not be construed as limitation of the present invention.
Claims (1)
1. a contactless biological recognition system, it is characterised in that including:
Contactless biometric sensor, for gathering infrared vein image and the body surface texture image of organism；
Data Transmission Control Unit, is connected with described biometric sensor, for by the body surface texture image of described organism and red
Outer vein image sends to data processing equipment；
Data processing equipment, is connected with described Data Transmission Control Unit, for by the body surface texture image of described organism and infrared
Vein image carries out pretreatment and feature extraction, carries out Characteristic Contrast with the sample pre-saved, it is achieved identification；
Described contactless biometric sensor includes: launch visible ray and the active light source of near infrared light, single imaging lens
Head, light splitting part, infrared image acquisition device, visible images harvester, infrared proximity induction apparatus and be arranged at described master
Light guide ring above dynamic light source；
Described light splitting part is positioned at the rear of described imaging lens, described infrared image acquisition device and visible images harvester
It is respectively positioned on the rear of described light splitting part；Wherein,
Described active light source, is arranged at the side of single imaging lens, including spaced near-infrared luminous element and visible ray
The combination of light-emitting component, for irradiating above described imaging lens or the image acquisition region in front, it is near that this active light source is launched
The wave-length coverage of infrared light is 760nm～940nm；
Described imaging lens, for receiving the light wave reflected from the organism of described image acquisition region；
Described light splitting part, specially two surfaces are coated with infrared filtering thin film and the Amici prism of visible ray light filter film respectively, use
In the light wave from described imaging lens transmission being divided into a road visible ray and a road near infrared light；
Described infrared image acquisition device, for gathering after described light splitting part light splitting, the near-infrared light waves of outgoing, to be formed
Reflect the infrared vein image of described organism vein pattern；
Described visible images harvester, for gathering after described light splitting part light splitting, the visible light wave of outgoing, to be formed
Reflect the body surface texture image of described organism appearance textural characteristics；
Described infrared proximity induction apparatus, is connected with described active light source, image collecting device, when described organism enters away from described
When imaging lens is the image acquisition region of the predeterminable range of 5～10 centimeters, triggers described active light source and/or described image is adopted
Acquisition means works；
Described light guide ring, for making the light homogenization of active light source.
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