CN103679153A - Finger multi-modal biometric characteristic polarization imaging system - Google Patents
Finger multi-modal biometric characteristic polarization imaging system Download PDFInfo
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- CN103679153A CN103679153A CN201310713110.8A CN201310713110A CN103679153A CN 103679153 A CN103679153 A CN 103679153A CN 201310713110 A CN201310713110 A CN 201310713110A CN 103679153 A CN103679153 A CN 103679153A
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Abstract
A finger multi-modal biometric characteristic polarization imaging system comprises an external acquisition device and a computer. The external acquisition device comprises a single-chip microcomputer, an LED (light-emitting diode) selection circuit, a sliding module, an LED array, a fingerprint acquisition module, a finger vein camera, a knuckle print camera, a zero-degree polarization detection filter, a 90-degree polarization detection filter, a high-pass filter, a low-pass filter and a reflecting partition. The finger multi-modal biometric characteristic polarization imaging system can simultaneously acquire finger veins, fingerprints and knuckle prints and has the advantages that the positions of the finger vein camera and the knuckle print camera can be automatically adjusted, the sequences and quantization of different bands of beams can be controlled in multispectral acquisition, and imaging noise is decreased by the aid of the polarization imaging principle.
Description
Technical field
The invention belongs to Computer Recognition Technology field, particularly relate to a kind of finger multi-modal biological characteristic polarized imaging system.
Background technology
In living things feature recognition field, current research, to apply more be physical characteristics collecting and the recognition technology of single mode.Multi-modal biological characteristic identification is an emerging field.To finger vena, fingerprint, the unified research gathering of phalangeal configurations three mode, seldom there is especially associated mechanisms doing.Existing above-mentioned finger three mode collecting devices, such as the collecting device of Tianjin University of Technology, can realize the unified collection of finger vena, fingerprint, phalangeal configurations three mode at present.But there is many deficiencies.First the image-forming module position of this type of collecting device is fixed, and people's finger have long have short, can not guarantee that area-of-interest that three mode are positioned at imaging region and three mode is simultaneously positioned at gathers picture centre position, therefore can not be applicable in actual acquisition.Secondly, this type of collecting device is all to utilize traditional optical image-forming principle, and due to the inherent defect of traditional optical, the quality that is determining to gather image is not very high.Again, the light source of existing collecting device is single spectrum, and biological tissue can present different characteristics under different spectrum, therefore there is no fully to excavate the feature of biological tissue.
Summary of the invention
In order to address the above problem, the object of the present invention is to provide a kind of finger multi-modal biological characteristic polarized imaging system.
In order to achieve the above object, finger multi-modal biological characteristic polarized imaging system provided by the invention is comprised of outside harvester and computing machine; Outside harvester comprises: single-chip microcomputer, LED select circuit, sliding block, LED array, finger print acquisition module, refer to vein camera, phalangeal configurations camera, zero degree analyzing filter disc, 90 degree analyzing filter discs, high pass filter disc, low pass filter disc and reflective dividing plate; Wherein: single-chip microcomputer selects circuit to be connected with sliding block with LED, and is connected with computing machine by serial data line; It is that LED light source group drives selection circuit that LED selects circuit, and it is connected with LED array; Sliding block is two groups of translation gear trains, is separately installed with and refers to vein camera and phalangeal configurations camera on it; LED array comprises the first polarized light source group and the second polarized light source group, and it forms by LED lamp group and the zero degree polarizer that is arranged on the place ahead; The first polarized light source group is vertical irradiation array of source, and it is separately positioned on the both sides of phalangeal configurations camera; The second polarized light source group is two groups of inclination angle light sources, and it is separately positioned on the outside of two group of first polarized light source group, and is 15 degree angles with horizontal direction; The LED array of the two waveband that has all comprised the LED array of the two waveband that is used in reference to vein collection in polarized light source group and polarized light source group and gathered for phalangeal configurations; Finger print acquisition module is the fingerprint acquisition device that is arranged on tested finger fingertip below, and it is connected with computing machine; Refer to that vein camera is the finger vein image acquisition device that is arranged on below, tested finger middle part, it is connected with computing machine; Phalangeal configurations camera is the phalangeal configurations image collecting device that is arranged on top, tested finger middle part, and it is connected with computing machine; The place ahead that refers to vein camera is provided with zero degree analyzing filter disc and high pass filter disc successively; The place ahead of phalangeal configurations cam lens is provided with 90 degree analyzing filter discs and low pass filter disc successively; In the both sides that refer to vein camera and phalangeal configurations cam lens, be separately installed with one group of reflective dividing plate; Computing machine is connected with outside harvester.
Described computing machine is provided with the serial communication interface being connected with outside.
Described zero degree analyzing filter disc is zero degree optics analyzer.
90 described degree analyzing filter discs are 90 degree optics analyzers.
Described high pass filter disc adopts HB730 optical filter.
Described low pass filter disc adopts LB550 optical filter.
When finger multi-modal biological characteristic polarized imaging system provided by the invention can be realized finger vena, fingerprint, phalangeal configurations, gather, its tool has the following advantages:
1) can realize and refer to that the position of vein camera and phalangeal configurations camera regulates automatically.
2) in the time of can realizing multispectral collection to the sequential control of different-waveband light beam and quantified controlling.
3) utilize polarization imaging principle to be reduced to picture noise.
Accompanying drawing explanation
Fig. 1 is the theory diagram of finger multi-modal biological characteristic polarized imaging system provided by the invention.
Fig. 2 is the imaging optical path schematic diagram of outside harvester provided by the invention.
Fig. 3 is the schematic diagram that in finger multi-modal biological characteristic polarized imaging system provided by the invention, LED selects circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments, finger multi-modal biological characteristic polarized imaging system provided by the invention is elaborated.
As shown in Figure 1 and Figure 2, finger multi-modal biological characteristic polarized imaging system provided by the invention is comprised of outside harvester 10 and computing machine 20; The collecting part that outside harvester 10 be native system, it comprises: single-chip microcomputer 1, LED select circuit 2, sliding block 3, LED array 4, finger print acquisition module 5, refer to vein camera 6, phalangeal configurations camera 7, zero degree analyzing filter disc 81,90 are spent analyzing filter discs 82, high pass filter disc 91, low pass filter disc 92 and reflective dividing plate 10; Wherein: single-chip microcomputer 1 is data transmit-receive control center, it selects circuit 2 to be connected with sliding block 3 with LED, and is connected with computing machine 20 by serial data line; LED selects circuit 2 to select circuit for LED light source group drives, and it is connected with LED array 4; Sliding block 3 is two groups of translation gear trains, on it, be separately installed with and refer to vein camera 6 and phalangeal configurations camera 7, it can receive the instruction of single-chip microcomputer 1, control respectively and refer to that vein camera 6 and phalangeal configurations camera 7 do horizontal shift, thereby adjust the image acquisition point position that refers to vein camera 6 and phalangeal configurations camera 7; LED array 4 comprises the first polarized light source group 41 and the second polarized light source group 42; It forms by LED lamp group and the zero degree polarizer that is arranged on the place ahead, and the light that LED lamp group is sent becomes polarized light by the polarizer; The first polarized light source group 41 is vertical irradiation array of source, and it is separately positioned on the both sides of phalangeal configurations camera 7; The second polarized light source group 42 is two groups of inclination angle light sources, and it is separately positioned on the outside of two group of first polarized light source group 41, and is 15 degree angles with horizontal direction; The LED array of the two waveband that has all comprised the LED array of the two waveband that is used in reference to vein collection in polarized light source group 41 and polarized light source group 42 and gathered for phalangeal configurations, can access the characteristic image of each mode under different spectrum different light angles like this; Finger print acquisition module 5 is for being arranged on the fingerprint acquisition device of tested finger 30 finger tip belows, and it is connected with computing machine 20; Refer to that vein camera 6 is for being arranged on the finger vein image acquisition device of tested finger 30 belows, middle part, it is connected with computing machine 20; Phalangeal configurations camera 7 is for being arranged on the phalangeal configurations image collecting device of tested finger 30 tops, middle part, and it is connected with computing machine 20; The place ahead that refers to vein camera 6 is provided with zero degree analyzing filter disc 81 and high pass filter disc 91 successively; The place ahead of phalangeal configurations camera 7 camera lenses is provided with 90 degree analyzing filter disc 82 and low pass filter discs 92 successively; In the both sides that refer to vein camera 6 and phalangeal configurations camera 7 camera lenses, be separately installed with one group of reflective dividing plate 10, for convection light energy; 90 degree analyzing filter discs 82 of phalangeal configurations obtain comprising diffusing of abundant biological epidermis characteristic information for filtering light beam; The zero degree analyzing filter disc 81 that refers to vein obtains for filtering non-polarized light beam the transmitted light beam that comprises finger vein features information; High pass filter disc 92 is for the light beam below filtering 730nm; Low pass filter disc is for light beam more than filtering 550nm; The control calculating section that computing machine 20 is native system, is connected with outside harvester 10.The control calculation procedure of computing machine 20 is mainly responsible for: order drives camera and gathers video flowing; Drive fingerprint capturer to gather image; Record picker's information; The ROI(area-of-interest of location finger vena) region, goes out the location parameter of phalangeal configurations according to the ROI position calculation that refers to vein, and judges whether to carry out position adjustments to finger vein and phalangeal configurations image-forming module; Send various control commands.
Described computing machine 20 is provided with the serial communication interface being connected with outside, for realizing exchanges data with external system or device.
Described zero degree analyzing filter disc 81 is zero degree optics analyzer, for passing through zero degree polarized light.
90 described degree analyzing filter discs 82 are 90 degree optics analyzers, for filtering zero degree polarized light.
Described high pass filter disc 91 adopts HB730 optical filter, for passing through near infrared light.
Described low pass filter disc 92 adopts LB550 optical filter, for passing through visible ray.
Native system adopts two groups of polarized light sources, and every group of light source consists of the LED of two wave bands.Biological tissue is less than 700nm light wave to wavelength and has stronger absorption, and this wave band light wave is shaken off reflection and the light that enters organization internal generally can not see through finger.The visible ray of wavelength between 400nm-600nm has good skin surface reflecting effect.Phalangeal configurations is catoptric imaging, therefore selects the visible ray of 400nm-600nm wave band, and when polarization imaging experimental verification adopts the light velocity of 470nm and 495nm wave band, phalangeal configurations imaging effect is best.Finger vein is transmission imaging, selects to be greater than near-infrared light waves more than 700nm, through polarization imaging experimental verification, for obtaining optimal imaging effect, should adopt 830nm and the two spectrum of 850nm.Finger print acquisition module 5 adopts is ready-made finished product module, can gather the fingerprint image of better quality.
For fear of each light source, influence each other, each imaging camera module is all furnished with analyzing filter disc and filter plate.Consider that LED peak value has the fluctuation of positive and negative 10nm, refer to that vein imaging unit stops the light wave below 730nm to pass through, the low pass filter disc 92 of phalangeal configurations image-generating unit stops light wave more than 550nm to pass through, so substantially, the light source of having stopped between each image-generating unit disturbs, and has guaranteed that each mode biological characteristic imaging is independent of each other; Can there are four kinds of variations in polarizing light irradiation finger skin: reflection, refraction, diffuse reflection and scattering.Reflection and refraction do not destroy polarized state of light, and diffuse reflection and scattering all can be eliminated polarisation of light characteristic and make it to become natural light (without polarization characteristic).In diffusing, comprised very abundant skin biological information.In phalangeal configurations imaging process, by 90 degree analyzing filter discs 82 elimination light beams, obtain diffuse reflection light beam and can obtain biological tissue's epidermis characteristic image clearly.Polarized lightwave enters finger interior three kinds of states: absorption, scattering and transmission.The light that directly transmission is gone out keeps polarization characteristic, and the light scattering out has lost polarization state completely, becomes natural light.In finger vena imaging, scattering reduces a key factor of vein image contrast just, therefore, adopts zero degree analyzing filter disc 81 to eliminate unpolarized component, is extremely conducive to improve the quality of finger venous image.
According to the difference that gathers position, native system is equipped with the optical lens of different focal with the camera sensing device of equal resolution, realization each mode image on imaging plane has approximate resolution, to reduce follow-up ROI(area-of-interest) the issuable feature deformation of region normalization.In addition, consider that phalangeal configurations has concavo-convex phenomenon, two spectroscopic light sources are placed in camera both sides with different angles respectively, realize alternately luminously by control circuit, reach the object of abundant excavation imaging surface and internal information thereof.
Medical research shows, biological tissue has different optical characteristics under different wave bands.Therefore, conversion spectrum can detect the feature of the different medium that biological tissue contains.Therefore be designed to picture control circuit for light source, LED selects circuit 2, and it mainly contains two functions: the one, realize the sequential control of two waveband light source luminescent; The 2nd, realize the quantified controlling of light source luminescent intensity.The object of sequential control is in order to obtain the biometric image of different-waveband, and the object of quantified controlling is to make the luminous intensity of light source adapt to the actual conditions of pointing change of shape.The sequential control of light source selects circuit 2 to realize by single-chip microcomputer 1 and LED.Its basic functional principle is that single-chip microcomputer 1 receives the selection signal that computing machine 20 sends, and selects the corresponding interface input voltage of circuit 2 to LED, and light path is selected circuit to obtain after electric and lighted corresponding lamp group.As shown in Figure 3, four groups of lamp group interfaces adopt common-anodes to the part schematic diagram of LED selection circuit 2 as seen from the figure, are convenient to like this single-chip microcomputer 1 pin and directly control.Quantified controlling is by PWM(pulse-length modulation) principle realization.In the square wave of certain frequency, adjust high level and low level dutycycle, can realize.Such as we light a LED lamp by low level, we suppose a frequency period to be divided into 10 time equal portions, if the low and high level dutycycle in square wave is 9:1, that is to say in a level output cycle T only has the time of 1/10T to light LED, when frequency surpasses 100Hz, due to human eye vision residual effect, just can allow human eye cannot perceive flicker, at this moment the just variation of brightness of experiencing is exactly a darker brightness.If low and high level dutycycle is 10:0 in square wave, at this moment, be all high level, lamp goes out.If dutycycle is 5:5, be exactly an intermediate luminance, if height is than being 1:9, be a brighter brightness, if height is 0:10, be at this moment all low level, be exactly the brightest.Native system is provided with nine intensity levels according to this principle.In addition acquisition system each side has a highlighted pilot lamp, and one is green light, and one is red light.Green light is that camera connects pilot lamp, and when camera is normally worked, green light lights, and during fault, green light extinguishes.Red light is control circuit pilot lamp, and when control circuit powers on and normally works, red light is lighted, if control circuit can not power on, red light is in extinguishing state, if control circuit can power on but cisco unity malfunction, red light can glimmer.
In order to collect phalangeal configurations image clearly, what native system was installed on phalangeal configurations photographing module is micro-lens, and this acquisition range that has just determined camera lens is very limited.And the finger of different people is different in size, when finger 30 is while putting into harvester, the position of finger 30 is not necessarily fingerprint, phalangeal configurations simultaneously, refer to the most applicable acquisition zone of vein.Therefore quickly and easily the position of three cameras is regulated and just seems very important.We fix finger print acquisition module 5, as the standard of determining finger placement location, so only need to mobile phalangeal configurations acquisition camera 7 just can collect our area-of-interest with finger vein acquisition camera 6 simultaneously.Its principle of work is: the control calculation procedure of computing machine 20, by locating the highlight regions at the two ends, ROI region of finger vena, obtain the location parameter that refers to vein ROI region, according to this parameter, control the location parameter that calculation procedure calculates phalangeal configurations, compare respectively each anchor point distance in two positions parameter and can draw sliding block moving parameter in the position of image border separately, by serial port, sending regulating command is adjustable phalangeal configurations camera 7 and the position that refers to vein camera 6.The principle of confounding of this system not only can be guaranteed to collect the characteristic image that refers to vein, phalangeal configurations, fingerprint three mode simultaneously, can also guarantee that the ROI region of each mode is positioned at the center that gathers image, is conducive to feature extraction and the identification in later stage.
Finger multi-modal biological characteristic polarized imaging system provided by the invention adopt finger fingerprint, refer to vein and three kinds of biological mode of phalangeal configurations, feature is different.Fingerprint is positioned at the top of venous backflow, is least significantly region of finger vein features; Phalangeal configurations is positioned at dorsal part, is the non-imaging region of finger vena.Fingerprint, refer to that vein and phalangeal configurations lay respectively at the zones of different of finger and do not interfere with each other, this provides natural condition for realizing unified collection of three mode biological characteristics.If utilize traditional optical formation method, be difficult to obtain three mode biometric images of better quality simultaneously.Consider multispectral characteristic and the polarized light imaging characteristics of biological tissue, native system adopts take the multi-modal biological characteristic imaging scheme that two spectrum polarizing light is basic finger.Under reflective-mode, utilize polarized light can survey the internal information on biological tissue surface.Under transmission mode, utilize polarized light can weaken the scattered noise that biological tissue produces, improve image quality.
Claims (6)
1. a finger multi-modal biological characteristic polarized imaging system, is characterized in that: it is comprised of outside harvester (10) and computing machine (20); Outside harvester (10) comprising: single-chip microcomputer (1), LED select circuit (2), sliding block (3), LED array (4), finger print acquisition module (5), refer to vein camera (6), phalangeal configurations camera (7), zero degree analyzing filter disc (81), 90 degree analyzing filter discs (82), high pass filter disc (91), low pass filter disc (92) and reflective dividing plate (10); Wherein: single-chip microcomputer (1) selects circuit (2) to be connected with sliding block (3) with LED, and is connected with computing machine (20) by serial data line; LED selects circuit (2) to select circuit for LED light source group drives, and it is connected with LED array (4); Sliding block (3) is two groups of translation gear trains, is separately installed with and refers to vein camera (6) and phalangeal configurations camera (7) on it; LED array (4) comprises the first polarized light source group (41) and the second polarized light source group (42), and it forms by LED lamp group and the zero degree polarizer that is arranged on the place ahead; The first polarized light source group (41) is vertical irradiation array of source, and it is separately positioned on the both sides of phalangeal configurations camera (7); The second polarized light source group (42) is two groups of inclination angle light sources, and it is separately positioned on the outside of two group of first polarized light source group (41), and is 15 degree angles with horizontal direction; The LED array of the two waveband that has all comprised the LED array of the two waveband that is used in reference to vein collection in polarized light source group (41) and polarized light source group (42) and gathered for phalangeal configurations; Finger print acquisition module (5) is for being arranged on the fingerprint acquisition device below tested finger (30) finger tip, and it is connected with computing machine (20); Refer to that vein camera (6) is for being arranged on the finger vein image acquisition device below tested finger (30) middle part, it is connected with computing machine (20); Phalangeal configurations camera (7) is for being arranged on the phalangeal configurations image collecting device above tested finger (30) middle part, and it is connected with computing machine (20); The place ahead that refers to vein camera (6) is provided with zero degree analyzing filter disc (81) and high pass filter disc (91) successively; The place ahead of phalangeal configurations camera (7) camera lens is provided with 90 degree analyzing filter discs (82) and low pass filter disc (92) successively; In the both sides that refer to vein camera (6) and phalangeal configurations camera (7) camera lens, be separately installed with one group of reflective dividing plate (10); Computing machine (20) is connected with outside harvester (10).
2. finger multi-modal biological characteristic polarized imaging system according to claim 1, is characterized in that: described computing machine (20) is provided with the serial communication interface being connected with outside.
3. finger multi-modal biological characteristic polarized imaging system according to claim 1, is characterized in that: described zero degree analyzing filter disc (81) is zero degree optics analyzer.
4. finger multi-modal biological characteristic polarized imaging system according to claim 1, is characterized in that: 90 described degree analyzing filter discs (82) are 90 degree optics analyzers.
5. finger multi-modal biological characteristic polarized imaging system according to claim 1, is characterized in that: described high pass filter disc (91) adopts HB730 optical filter.
6. finger multi-modal biological characteristic polarized imaging system according to claim 1, is characterized in that: described low pass filter disc (92) adopts LB550 optical filter.
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| CN105550629A (en) * | 2015-08-03 | 2016-05-04 | 宇龙计算机通信科技(深圳)有限公司 | Identity identification method and apparatus |
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