CN204557512U - A kind of finger vein image acquisition system with high resolution - Google Patents
A kind of finger vein image acquisition system with high resolution Download PDFInfo
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- CN204557512U CN204557512U CN201520172940.9U CN201520172940U CN204557512U CN 204557512 U CN204557512 U CN 204557512U CN 201520172940 U CN201520172940 U CN 201520172940U CN 204557512 U CN204557512 U CN 204557512U
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Abstract
The utility model discloses a kind of finger vein image acquisition system with high resolution, comprise the sampler chamber for holding finger, for irradiating the infrared light supply module of finger and obtaining the image-generating unit of finger venous image, described infrared light supply module comprises at least two group light sources, and each group light source is arranged along interval, finger length direction; Described finger vein image acquisition system also comprises: at least two light intensity receivers, for detecting the transmittance of finger position under corresponding group light source irradiation; Regulating circuit, receives the transmittance signal of each light intensity receiver, and according to the corresponding intensity of illumination organizing light source of each transmittance signal adjustment.The utility model can make finger each position vein imaging brightness uniformity, improves finger vena image quality, is conducive to follow-up image characteristics extraction and identification work.
Description
Technical field
The utility model relates to biometrics identification technology field, particularly a kind of finger vein image acquisition system with high resolution.
Background technology
Identity recognizing technology based on biological characteristic utilizes the feature of human body self to carry out identification, by means of its safety and advantage easily, has become the personal identification method of a new generation.Finger vein identification technology due to its have untouchable, do not affect by skin surface humidity, by advantages such as people steal, can not receive much concern in recent years, there is very large development potentiality.Its principle is: when pointing with the near infrared light near 850nm, haemoglobin in finger vena can than the more near infrared light of other biological tissue resorption in finger, to the lines that just can obtain finger vena after the imaging of finger transmitted light, the difference of everyone finger vein grain is utilized to realize identification.
Authorization Notice No. CN 201845346U patent document discloses a kind of finger vein image acquisition recognition device, is made up of device case, signal processing circuit, finger placing machine, inductive switch, infrared light supply, thermal camera, infrared light supply brightness regulating circuit, the result pilot lamp, keyboard, Keyboard Control plate, display screen, power interface, external interface and device start switch.This device has vein image acquisition and recognition function, and finger vena collecting part takes the designing technique automatically regulating infrared light supply brightness according to the vein image quality of picked-up; In finger locating slot front portion, inductive switch is installed to be used for transmitting whether start image pick-up signal to signal processing circuit.
Authorization Notice No. CN 101833657 B patent document discloses a kind of automatic light intensity regulation circuit of infrared light source, adjustment process comprises: infrared light supply irradiates hand position, the imaging on an imaging device of its transmitted light, the infrared receiving tube Q0 being also installed in imaging device other receives light signal; The light intensity received defines proportional electric current, feedback voltage UI is obtained by triode Q1 and subtracter, UI can approximately equivalent in the subtracter of light intensity voltage by being made up of amplifier device, light intensity voltage (feedback voltage) UI is compared with preset standard input voltage Uin, obtains deviation voltage Ue; By the integrating circuit be made up of amplifier device, intensity control voltage U out can be obtained; Intensity control voltage U out by forming output current after resistance R7, and passes through the transmitter current of triode Q2 formation control infrared external reflection pipe, and then controls emitted luminescence intensity.
Said apparatus gathers finger vena by many finger steady arms, and the arrow appropriateness that increase finger vena gathers and the dirigibility of different finger collection, also adopt simultaneously and become light technology collection finger venous image, improve the sharpness that finger vena gathers.
But the thickness pointing different parts (each dactylus) due to everyone is different, namely light transmission is different, but said apparatus does not regulate light source luminescent intensity for finger different parts, this will cause finger vena brightness of image uneven, imaging results is unintelligible, has a strong impact on the accuracy of identification.
Utility model content
The utility model provides a kind of finger vein image acquisition system with high resolution, and finger different parts can collect image clearly, and structure is simple, stable.
A kind of finger vein image acquisition system with high resolution, comprise the sampler chamber for holding finger, for irradiating the infrared light supply module of finger and obtaining the image-generating unit of finger venous image, described infrared light supply module comprises at least two group light sources, and each group light source is arranged along interval, finger length direction;
Described finger vein image acquisition system also comprises:
At least two light intensity receivers, for detecting the transmittance of finger position under corresponding group light source irradiation;
Regulating circuit, receives the transmittance signal of each light intensity receiver, and according to the corresponding intensity of illumination organizing light source of each transmittance signal adjustment.
The utility model uses different light sources to irradiate the different position of finger, and by corresponding light intensity receiver to the transmitted light intensity pointing different positions, if the result detected is different from the value preset, the intensity of illumination of corresponding group light source is regulated by regulating circuit, realize the automatic adjustment of light source luminescent intensity, thus the transmittance at the position making finger different is substantially identical, makes imaging device collect the image of brightness uniformity, be conducive to the raising of image quality.
Wherein, regulating circuit can be arrange at least two automatic light intensity regulation circuit of infrared light source as described in the background art, receive the transmittance signal of corresponding light intensity receiver (infrared receiving tube) respectively, and according to the corresponding intensity of illumination organizing light source of each transmittance signal adjustment.
In order to simplify circuit, preferably, described regulating circuit comprises:
At least two group amplifier circuit, are connected with corresponding light intensity receiver to receive transmittance signal;
Control module, connects each amplifier circuit signal output terminal, sends corresponding control signal in order to the signal according to amplifier circuit;
The sub-regulating circuit of at least two groups, in the feed circuit of output terminal access corresponding group light source, for regulating the electric current of feed circuit, the signal input part of each sub-regulating circuit is all connected with control module.
Preferred further, each sub-regulating circuit comprises: the analog multiplexer of reception control signal, control the constant-current source circuit in multiple constant current resistance of gating and the feed circuit of corresponding access light source by analog multiplexer, each constant current resistance access constant-current source circuit is with the output current of regulating constant current source circuit.
The regulating circuit of said structure regulates rapidly, good stability.
Preferably, described infrared light supply module is arranged on the top of sampler chamber, is provided with light inlet window in the bottom of sampler chamber, and described image-generating unit is in immediately below light inlet window.
In order to make finger put steadily, improving imaging effect, preferably, in described sampler chamber, being provided with finger support bar.
Preferably, described light intensity receiver is in light inlet window side-lower, dodges the main optical path between infrared light supply module and image-generating unit.Light intensity receiver, for detecting the transmittance of finger, can not block infrared light supply module and image-generating unit light path, therefore be arranged on light inlet window side-lower.
The top of described sampler chamber or bottom are relative concepts, introduce the putting position of each parts for convenience of description, after sampler chamber turns over 90 degree, then correspondence can become left part and right part.
For the ease of installing, preferably, the top of described sampler chamber is provided with light source and installs gap, and described infrared light supply module also comprises the installing plate being provided with described light source, and described installing plate is mounted on the outer wall of sampler chamber, and each light source snaps in described light source and installs in gap.
General finger all comprises three dactylus, and between dactylus, thickness is different, and therefore, corresponding each dactylus arranges light source, and preferably, described light source is provided with three groups, and equi-spaced apart is arranged.
Preferably, described light intensity receiver is hard-wired infrared receiving tube.
The beneficial effects of the utility model:
The finger vein image acquisition system with high resolution of the present utility model, can make finger each position vein imaging brightness uniformity, improves finger vena image quality, is conducive to follow-up image characteristics extraction and identification work.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
Fig. 2 is the structural representation of infrared light supply module of the present utility model.
Fig. 3 is the structural representation of light intensity receiver of the present utility model.
Fig. 4 is regulating circuit principle schematic of the present utility model.
Fig. 5 is the connection diagram of the amplifier circuit of regulating circuit of the present utility model.
Fig. 6 is the connection diagram of the sub-regulating circuit of regulating circuit of the present utility model.
Embodiment
As shown in Figures 1 to 3, the finger vein image acquisition system with high resolution of the present embodiment comprises: comprise the sampler chamber 1 for holding finger 7, the top of sampler chamber 1 is provided with the infrared light supply module 2 of irradiating finger, the bottom of sampler chamber 1 is provided with light inlet window 11, the image-generating unit 3 obtaining finger venous image is provided with immediately below light inlet window 11, light inlet window 11 side-lower is installed with light intensity receiver 4, is also provided with finger support bar 13 in sampler chamber 1.
The top of sampler chamber 1 is provided with light source and installs gap 12, infrared light supply module 2 comprises three groups of light sources 21 arranged along finger length direction equi-spaced apart, and the installing plate 22 of light source 21 is installed, installing plate 22 is mounted on the outer wall of sampler chamber 1, and each light source 21 snaps in light source and installs in gap 12; Light source 21 adopts infrarede emitting diode.
Often organize light source to be composed in series by 3 SMD infrarede emitting diodes (LED), the lighting angle of infrarede emitting diode is 120 degree, and 3 groups of light sources are responsible for the illumination of three sections of dactylus before, during and after finger respectively.
Light intensity receiver 4 is infrared receiving tube (VD), corresponding each light source 21 is provided with three groups, be responsible for detecting the transmittance of three sections of dactylus before, during and after pointing respectively, each infrared receiving tube is arranged on base plate 5 along finger length direction equi-spaced apart, sensitive surface and the surface level of infrared receiving tube are at a certain angle, it is 45 degree that the present embodiment gathers angle, makes sensitive surface towards finger.
Image-generating unit 3 comprises optical lens 31, cmos element and circuit 32, and the focal length of optical lens is 6mm, and field angle is 54.6 degree, and the CMOS chip of employing is of a size of 1/2 inch, and resolution is 1280 × 1024.
The present embodiment also comprises regulating circuit, and regulating circuit is arranged on circuit board 6, receives the transmittance signal of each light intensity receiver 4, and according to the corresponding intensity of illumination organizing light source 21 of each transmittance signal adjustment.
As shown in Figure 4, regulating circuit comprises:
Three groups of amplifier circuit, are connected with corresponding light intensity receiver 4 to receive transmittance signal;
Control module, connect each amplifier circuit signal output terminal, corresponding control signal is sent in order to the signal according to amplifier circuit, in the present embodiment, control module adopts micro-control unit (Micro Control Unit, be called for short MCU), model is that the A/D converting interface of C8051F021, MCU connects amplifier circuit signal output terminal.
Three groups of sub-regulating circuits, in the feed circuit of output terminal access corresponding group light source 21, for regulating the electric current of feed circuit, the signal input part of each sub-regulating circuit is all connected with control module.
Three groups of amplifier circuit structures are identical, and wherein one group as shown in Figure 5;
Three groups of sub-regulating circuit structures are identical, wherein one group as shown in Figure 6, each sub-regulating circuit comprises: the analog multiplexer of the I/O mouth of access MCU, control the constant-current source circuit in multiple constant current resistance (R1, R2, R3, R4) of gating and the feed circuit of corresponding access light source by analog multiplexer, each constant current resistance access constant-current source circuit is with the output current of regulating constant current source circuit.
Wherein, precision amplifier adopts OPA4277, and infrared receiving tube, is expressed as VD in figure, adopts Q62702P0129, sampling resistor R6 to adopt 1K Ω.Device in constant-current source circuit adopts TL431 and Q9013, and analog multiplexer adopts ADG1408YRUZ.
The implementation process of the present embodiment: the light source 21 that can be controlled separately by three groups is thrown light on three sections of dactylus before, during and after finger 7 respectively, and the input current often organizing light source 21 is provided by the constant-current source circuit of correspondence, infrared receiving tube receives the transmitted light intensity of corresponding dactylus, the voltage U 1 that sampling resistor produces of three infrared receiving tubes, U2, U3 show respectively through finger front end, the transmitted light intensity size of middle part and afterbody, the transmittance signal produced is read by MCU after A/D conversion, first MCU compares the size of U3 and predetermined threshold value, if U3 is less than the lower limit of setting, then control multi-channel analog multiplexer to the resistance of little one grade of constant-current source circuit access by MCU, increase the brightness of finger afterbody light source, if U3 is greater than the higher limit of setting, then control multi-channel analog multiplexer to the resistance of large one grade of constant-current source circuit access by MCU, reduce the brightness of finger afterbody light source, then the size of U2 and U1 and predetermined threshold value is compared again successively, the illumination intensity of finger middle part and front end is regulated, realize the automatic adjustment of light source luminescent intensity, thus make the imaging device being positioned at finger below obtain the image of brightness uniformity, be conducive to the raising of image quality.
Claims (9)
1. one kind has the finger vein image acquisition system of high resolution, comprise the sampler chamber for holding finger, for irradiating the infrared light supply module of finger and obtaining the image-generating unit of finger venous image, it is characterized in that, described infrared light supply module comprises at least two group light sources, and each group light source is arranged along interval, finger length direction;
Described finger vein image acquisition system also comprises:
At least two light intensity receivers, for detecting the transmittance of finger position under corresponding group light source irradiation;
Regulating circuit, receives the transmittance signal of each light intensity receiver, and according to the corresponding intensity of illumination organizing light source of each transmittance signal adjustment.
2. have the finger vein image acquisition system of high resolution as claimed in claim 1, it is characterized in that, described infrared light supply module is arranged on the top of sampler chamber, is provided with light inlet window in the bottom of sampler chamber, and described image-generating unit is in immediately below light inlet window.
3. there is the finger vein image acquisition system of high resolution as claimed in claim 1, it is characterized in that, in described sampler chamber, be provided with finger support bar.
4. have the finger vein image acquisition system of high resolution as claimed in claim 2, it is characterized in that, described light intensity receiver is in light inlet window side-lower, dodges the main optical path between infrared light supply module and image-generating unit.
5. there is the finger vein image acquisition system of high resolution as claimed in claim 2, it is characterized in that, the top of described sampler chamber is provided with light source and installs gap, described infrared light supply module also comprises the installing plate being provided with described light source, described installing plate is mounted on the outer wall of sampler chamber, and each light source snaps in described light source and installs in gap.
6. have the finger vein image acquisition system of high resolution as claimed in claim 1, it is characterized in that, described regulating circuit comprises:
At least two group amplifier circuit, are connected with corresponding light intensity receiver to receive transmittance signal;
Control module, connects each amplifier circuit signal output terminal, sends corresponding control signal in order to the signal according to amplifier circuit;
The sub-regulating circuit of at least two groups, in the feed circuit of output terminal access corresponding group light source, for regulating the electric current of feed circuit, the signal input part of each sub-regulating circuit is all connected with control module.
7. there is the finger vein image acquisition system of high resolution as claimed in claim 1, it is characterized in that, each sub-regulating circuit comprises: the analog multiplexer of reception control signal, control the constant-current source circuit in multiple constant current resistance of gating and the feed circuit of corresponding access light source by analog multiplexer, each constant current resistance access constant-current source circuit is with the output current of regulating constant current source circuit.
8. have the finger vein image acquisition system of high resolution as claimed in claim 1, it is characterized in that, described light source is provided with three groups, and equi-spaced apart is arranged.
9. have the finger vein image acquisition system of high resolution as claimed in claim 1, it is characterized in that, described light intensity receiver is hard-wired infrared receiving tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520172940.9U CN204557512U (en) | 2015-03-25 | 2015-03-25 | A kind of finger vein image acquisition system with high resolution |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520172940.9U CN204557512U (en) | 2015-03-25 | 2015-03-25 | A kind of finger vein image acquisition system with high resolution |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106960194A (en) * | 2017-03-24 | 2017-07-18 | 徐晨 | A kind of vein identification device |
| CN109844755A (en) * | 2017-08-01 | 2019-06-04 | 南京东屋信息科技有限公司 | Finger vein image acquisition device and smart lock |
| CN110188676A (en) * | 2019-05-29 | 2019-08-30 | Oppo广东移动通信有限公司 | Vein collection method and Related product |
| CN110533010A (en) * | 2019-10-10 | 2019-12-03 | 中国计量大学 | Adaptive light source finger vein image acquisition system |
-
2015
- 2015-03-25 CN CN201520172940.9U patent/CN204557512U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106960194A (en) * | 2017-03-24 | 2017-07-18 | 徐晨 | A kind of vein identification device |
| CN109844755A (en) * | 2017-08-01 | 2019-06-04 | 南京东屋信息科技有限公司 | Finger vein image acquisition device and smart lock |
| CN110188676A (en) * | 2019-05-29 | 2019-08-30 | Oppo广东移动通信有限公司 | Vein collection method and Related product |
| CN110188676B (en) * | 2019-05-29 | 2021-04-13 | Oppo广东移动通信有限公司 | Vein collection method and related products |
| CN110533010A (en) * | 2019-10-10 | 2019-12-03 | 中国计量大学 | Adaptive light source finger vein image acquisition system |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150812 Termination date: 20200325 |