CN206672127U - In-line light source finger vein image acquisition device - Google Patents
In-line light source finger vein image acquisition device Download PDFInfo
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- CN206672127U CN206672127U CN201720420922.7U CN201720420922U CN206672127U CN 206672127 U CN206672127 U CN 206672127U CN 201720420922 U CN201720420922 U CN 201720420922U CN 206672127 U CN206672127 U CN 206672127U
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- vein image
- infrared light
- image acquisition
- acquisition device
- liquid crystal
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Abstract
The utility model provides a kind of in-line light source finger vein image acquisition device, including shell, infrared light supply component, liquid crystal transmission board component, vein image acquisition device and microcontroller；The upper surface of the shell is provided with the arch groove for being used for placing finger, and cambered surface trench bottom is provided with loophole；The vein image acquisition device is located at the enclosure and positioned at the underface of the loophole；The infrared light supply component is provided with two and is distributed in the upper left side and upper right side of the shell, and then forms the structure that the infrared light supply component does not block the surface of the loophole and fore-and-aft direction irradiation of the in-line infrared laser along the loophole of infrared light supply component transmitting.The beneficial effects of the utility model reduce the width of light beam of infrared light supply, improve the concentration degree of light beam, reduce overexposure and under exposed situation；It is easy to observe the position that finger is placed, improves the accuracy rate of correct placement finger, alleviates the resentment of user；Improve vein image quality.
Description
Technical field
It the utility model is related to finger vein image acquisition technology, and in particular to a kind of in-line light source finger venous image
Harvester.
Background technology
Near-infrared phlebography imaging method is to utilize the hemoglobin in vein blood vessel strong to the absorptivity of near infrared light
When other physiological tissues such as skin, fat etc., transmission of near infra red light finger, near-infrared light beam produces unrestrained anti-in Fingers body
Penetrate, it is most of to be absorbed by finger physiological tissue, and superficial venae subcutaneae absorbs more near infrared light, forms radiography, can
Picture is captured as by optical sensor.
Current finger vena harvester arranges into a row composition light side by side provided with more near-infrared luminous diode lamp beads
Source, lamp bead are encapsulated as straw hat head straight cutting or the encapsulation of Surface Mount paperback, when there is finger to be put into vein acquirer position, open light source,
The light beam for sending near-infrared light source is irradiated to the Fingers back of the body, then transmitted through Fingers body, the optical sensor below finger is caught
Phlebography imaging is obtained, finger venous image is obtained, to make light intensity self-adaptive finger thickness, by the driving for adjusting every lamp bead
Current duty cycle, every lamp bead luminosity is adapted to the thickness of lower section finger, pass through the gray scale of the finger venous image of acquisition
It is distributed to adjust the luminous intensity of every lamp bead, the final finger venous image gathered under the suitable light intensity of a width.
Using existing venous collection device, user needs to place collector center of the finger immediately below light source, due to light
Source plate has sheltered from the sight that user sees oneself finger, finger easily deviates collection to user when in use in the surface of finger
The center position of device, causes finger vein image acquisition to fail.In addition, for very thin finger, due to common near-infrared luminous
The light beam that diode lamp bead is sent is divergence form, and dispersion angle is larger, and the width of light beam of the lit transmissive to finger is more than hand
Finger widths, light leak is caused, make to be placed on the optical sensor overexposure below finger, also easily cause finger vein image acquisition
Failure, generally require user after finger vein image acquisition failure and finger is placed on correct collector position again, by
Finger position is difficult to see that in user, easily produces resentment, reduces the convenience of the type acquisition method.
Utility model content
For in the prior art the defects of, the utility model provide in-line light source finger vein image acquisition device, with
The width of light beam of infrared light supply is shunk, improves the concentration degree of light beam, light leak is reduced and causes overexposure and under exposed situation；Just
In the position that observation finger is placed, the accuracy rate of correct placement finger is improved, alleviates the resentment of user；Improve vein image
Quality, reduce the probability of collection failure.
A kind of in-line light source finger vein image acquisition device, it is characterised in that including shell, infrared light supply component,
Liquid crystal transmission board component, vein image acquisition device and microcontroller；The upper surface of the shell is provided with the arc for being used for placing finger
Face groove, cambered surface trench bottom are provided with loophole；The vein image acquisition device is located at the enclosure and is located at the printing opacity
The underface in hole；The infrared light supply component is provided with two and is distributed in the upper left side and upper right side of the shell, and then shape
Into the infrared light supply component do not block the loophole surface and infrared light supply component transmitting in-line it is infrared swash
The structure of fore-and-aft direction irradiation of the light along the loophole；The liquid crystal transmission board component is located at the infrared light supply component
Transmitting terminal is used to control the intensity of illumination of in-line infrared laser to be distributed；The microcontroller respectively with the vein image acquisition
Device, infrared light supply component and liquid crystal transmission board component are electrically connected with.
Preferably, the infrared light supply component includes infrared light supply transmitter and for driving and controlling the infrared light
The first circuit board of source transmitter, the emission port of the infrared light supply transmitter is rectangle.Controlled using first circuit board red
The intensity of illumination of outer light source transmitter, the adjustability of intensity of illumination is realized, be advantageous to adjust the gray value of vein image.
Preferably, the fan-out angle for the yi word pattern laser that the Infrared laser emission device is sent is 120 °, the light launched
Plane and the angle of shell upper surface loophole are 60 ° or 120 °.And the projection width of in-line infrared laser is 2mm, ripple
A length of 850nm, spectral bandwidth 5nm.Make infrared light supply full illumination above the side of finger, even for very thin finger,
Also overexposure and under exposed situation can be reduced, improves collection success rate.
Preferably, the liquid crystal transmission board component includes multiple liquid crystal transmittance plate building-blocks, and each liquid crystal transmittance plate
The photograph intensity distribution of the corresponding in-line infrared laser region of building-blocks independent control.Due to finger, to have thickness to have thin, transmits finger
The light beam section of body thicker portion needs stronger light intensity, and the light beam section for transmiting finger body thinner part then needs weaker light
By force, liquid crystal transmittance plate building-blocks are independently controlled to the thicker portion of finger body and the transmissivity of thinner part, improve light intensity
It is adaptive, be advantageous to the distribution of light intensity.
Preferably, each liquid crystal transmittance plate building-blocks include liquid crystal transmittance plate and for driving and controlling the liquid crystal
The second circuit board of transmittance plate.Using the transmissivity of first circuit board control liquid crystal transmittance plate, the adjustability of transmissivity is realized, is had
Beneficial to the gray value of regulation vein image.
Preferably, the liquid crystal transmittance plate is covered in the emission port of the infrared light supply transmitter.Make what is emitted
Infrared light supply is controllable, is advantageous to adjust the gray value of vein image.
Preferably, the indicator lamp for guided placement finger is additionally provided with the loophole.Guiding user correctly places
Finger, it is easy to use.
Preferably, the transmissivity for every block of liquid crystal being transmitted to board component by the microcontroller is set to constant, two
Infrared light supply component irradiates once respectively, while the vein image acquisition device gathers two groups of vein images and is transmitted to accordingly
The microcontroller, microcontroller by handle by judge the vein image gray value whether setting intensity value ranges
Interior, if in the intensity value ranges of setting, the microcontroller is merged two groups of vein images, and final one group of acquisition is quiet
Arteries and veins image；If not in the intensity value ranges of setting, the microcontroller by control the liquid crystal transmit board component and
Infrared light supply component changes gray value, so that the gray value that the vein image acquisition thinks highly of freshly harvested vein image is adjusted
It is whole in the intensity value ranges of setting, then the vein image resurveyed is merged and regains one group of final vein
Image.
Preferably, vein image is divided into multistage by the microcontroller, and is to the gray value of every section of vein image
The no judgement in the intensity value ranges of setting, if there is be unsatisfactory for judge require one section or multistage vein image,
Then microcontroller send adjustment gray value and be transmitted to the signal of liquid crystal transmission board component and infrared light supply component.By vein
Image is divided into multistage and handled, and adjusts gray scale, makes that the contrast of vein image is higher, and dynamic range is wider, is advantageous to improve
Vein image quality.
Preferably, made by changing the transmissivity of the liquid crystal transmittance plate building-blocks and the intensity of illumination of infrared light supply component
The gray value for being unsatisfactory for judging the vein image of one section desired or multistage is adjusted in the intensity value ranges of setting.Increase quiet
The regulative mode of the gray value of arteries and veins image, the scope of the adjustability of gray value is improved, be advantageous to improve vein image quality.
The beneficial effects of the utility model：
The utility model includes shell, infrared light supply component, liquid crystal transmission board component, vein image acquisition device and microcontroller
Device, the infrared light supply component is provided with two and is distributed in the upper left side and upper right side of the shell upper surface, and then is formed
The infrared light supply component do not block the surface of arch groove and infrared light supply component transmitting in-line infrared laser along
The structure of the fore-and-aft direction irradiation of the arch groove.Infrared light supply component does not block the arch groove for placing finger, and user is using
When, finger is placed on correct position in the case of finger can be seen, improves the convenience used, adds vein figure
As the success rate of collection, user is slow down because gathering failure and the conflict mood of multi-pass operation.The liquid crystal transmission board component is set
It is used to control the intensity of illumination of in-line infrared laser to be distributed in the transmitting terminal of the infrared light supply component；Liquid crystal transmits board component
The different-thickness position that infrared light supply adapts to finger body automatically is improved, the favourable contrast for improving vein image acquisition, is reduced
Gather the probability of failure.Two infrared light supply components irradiate once respectively, while the vein image acquisition device gathers accordingly
Two groups of vein images and the microcontroller is transmitted to, microcontroller is by handling the gray value that will judge the vein image
It is no in the intensity value ranges of setting, if in the intensity value ranges of setting, the microcontroller enters two groups of vein images
Row fusion, finally obtains one group of vein image.By the fusion of two groups of images, make the dynamic range of image wider, be contrasted
Spend higher, the more uniform finger vena figure of intensity profile.If not in the intensity value ranges of setting, the microcontroller leads to
Cross and control the liquid crystal transmission board component and infrared light supply component to change gray value, so that the vein image acquisition is thought highly of
The gray value adjustment of freshly harvested vein image is melted in the intensity value ranges of setting, then by the vein image resurveyed
Merging regains one group of final vein image.By judgement of the microcontroller to the gray value of vein image, conjunction is filtered out
Suitable vein image, the resolution ratio for further improving image improve.
Brief description of the drawings
, below will be right in order to illustrate more clearly of the utility model embodiment or technical scheme of the prior art
The required accompanying drawing used is briefly described in embodiment or description of the prior art.In all of the figs, it is similar
Element or part are typically identified by similar reference.In accompanying drawing, each element or part might not be according to the ratios of reality
Draw.
Fig. 1 is structural representation of the present utility model；
Fig. 2 is Fig. 1 isometric views.
In accompanying drawing, 1- shells；2- infrared light supply components；3- liquid crystal transmission components, 4- vein image acquisition devices, 5- arch grooves
Embodiment
The embodiment of technical solutions of the utility model is described in detail below in conjunction with accompanying drawing.Following examples are only
For clearly illustrating the technical solution of the utility model, therefore example is only used as, and this practicality can not be limited with this
New protection domain.
It should be noted that unless otherwise indicated, technical term or scientific terminology used in this application should be this reality
The ordinary meaning understood with new one of ordinary skill in the art.
As depicted in figs. 1 and 2, in the present embodiment, a directions represent top, and b directions represent lower section, and c directions represent left, d
Direction represents right, and e directions represent front, and f directions represent rear.In-line light source finger vein image acquisition device includes outer
Shell 1, infrared light supply component 2, liquid crystal transmission board component 3, vein image acquisition device 4 and microcontroller, vein image acquisition device 4 are logical
Frequently with ccd sensor, infrared light supply component 2 includes infrared light supply transmitter and for driving and controlling infrared light supply to launch
The first circuit board of device, infrared light supply transmitter are in-line near infrared laser, and its power is 120mw, and infrared light supply is launched
A diameter of 12mm of the transmitting terminal of device, its emission port are rectangle, and the wavelength of the infrared light supply of transmitting is 850nm, spectral bandwidth
For 5nm, length is 40mm, width 2mm when projecting on finger.Utilize the light of first circuit board control infrared light supply transmitter
According to intensity, the adjustability of intensity of illumination is realized, is advantageous to adjust the gray value of vein image.The upper surface of shell 1, which is provided with, to be used for
The arch groove 5 of finger is placed, the bottom of arch groove 5 is provided with loophole, and loophole is rectangular shaped slot during implementation, is additionally provided with loophole
Indicator lamp for guided placement finger；Guiding user is correctly placed a finger on glass, easy to use.Vein image acquisition device
4 located at the inside of shell 1 and positioned at the underface of loophole, and vein image acquisition device 4 is the shooting of near-infrared optical sensor
Head.Infrared light supply component 2 is provided with two and is distributed in the upper left side and upper right side of the upper surface of shell 1, and then forms infrared light
Source component 2 does not block yi word pattern infrared laser that the surface of loophole and infrared light supply component 2 launch along loophole
The structure of fore-and-aft direction irradiation.The fan-out angle for the yi word pattern laser that the Infrared laser emission device is sent is 120 °, is launched
The angle of optical plane and shell upper surface loophole be 60 ° or 120 °, make infrared light supply full illumination in the top of finger, i.e.,
Make for very thin finger, can also reduce light leak situation, improve collection success rate；Here angle refers to the upper end water of shell 1
Obtuse angle between the smooth surface that plane and yi word pattern infrared laser are formed.Liquid crystal transmission board component is located at the hair of infrared light supply component 2
End is penetrated to be used to control the intensity of illumination of yi word pattern infrared laser to be distributed；Liquid crystal transmission board component 3 includes multiple liquid crystal transmittance plate groups
3 pieces of part, in-line infrared laser form multiple in-line infrared laser regions after the transmission of multiple liquid crystal transmittance plate building-blocks 3,
And the photograph intensity distribution of each liquid crystal transmission corresponding yi word pattern infrared laser region of 3 pieces of independent controls of board component.Due to hand
It is thin that finger has thickness to have, and the light beam section of transmission finger body thicker portion needs stronger light intensity, and transmits the light of finger body thinner part
Beam section then needs weaker light intensity, and liquid crystal transmits 3 pieces of board component to the thicker portion of finger body and the transmissivity of thinner part
It is independently controlled, improves the adaptive of light intensity, is advantageous to the distribution of light intensity.Each 3 pieces of board component of liquid crystal transmission includes liquid crystal
Transmittance plate and include the second circuit board of liquid crystal transmittance plate for driving and controlling.Utilize first circuit board control liquid crystal transmittance plate
Transmissivity, the adjustability of transmissivity is realized, be advantageous to adjust the gray value of vein image.Liquid crystal transmittance plate is covered in infrared light supply
The emission port of transmitter, the infrared light supply for making to emit can control, and be advantageous to adjust the gray value of vein image.Micro-control
Device processed is microcontroller, and microcontroller is electric with vein image acquisition device 4, infrared light supply component 2 and liquid crystal transmission board component 3 respectively
Property connection, microcontroller is additionally provided with the interface being connected with computer.
As depicted in figs. 1 and 2, the acquisition method of in-line light source finger vein image acquisition device is：
The first step, finger are placed on arch groove 5, signal controller preparation for acquiring, and microcontroller, which is sent, to be transmitted to positioned at cambered surface
The signal of the upper left left liquid crystal transmission board component 3 of groove 5, and make the transmissivity of left liquid crystal transmission board component 3 be constant.
Second step, microcontroller send the letter for being transmitted to the left infrared light supply component 2 corresponding to left liquid crystal transmission board component 3 again
Number, the yi word pattern infrared laser that left infrared light supply component 2 is launched after excessively left liquid crystal transmittance plate by slanting on the back side of finger.
3rd step, microcontroller send the signal for being transmitted to vein image acquisition device 4, and vein image acquisition device 4 gathers finger
Vein image and vein image is transmitted to processor.
Vein image is divided into multistage by the 4th step, microcontroller, and calculates the average value of every section of gray value, if these
Average value is both less than Gray_H and is more than Gray_L, then enters in next step；If there is one or more in these average values
More than Gray_H, then the vein image overexposure of this section or multistage is judged, microcontroller, which sends and is transmitted to, makes the section or more
The signal that the transmissivity of left 3 pieces of board component of liquid crystal transmission corresponding to section declines, the negative of 3 pieces of board component is transmitted by raising left liquid crystal
Pole tension, decline its transmissivity.And repeat to walk second step to the 4th step, until the average value of this three sections of vein image is all small
In Gray_H and it is more than Gray_L, then enters in next step.If there is one or more to be less than Gray_L in these average values,
Then judge that the vein image of this section or multistage is under-exposure, microcontroller, which sends and is transmitted to, makes left liquid corresponding to the section or multistage
The increased signal of transmissivity of crystalline substance 3 pieces of board component of transmission, the cathode voltage of 3 pieces of board component is transmitted by reducing left liquid crystal, makes it
Transmissivity increase；If the cathode voltage of left 3 pieces of board component of liquid crystal transmission falls below zero, still under-exposure, then microcontroller is sent out
Go out and be transmitted to the signal of first circuit board, increase the driving current of first circuit board, and then make left infrared light supply transmitter
Intensity of illumination becomes strong.And repeat to walk second step to the 4th step, until the average value of this three sections of vein image is both less than Gray_H
And it is more than Gray_L, then enters in next step.
5th step, microcontroller send the signal for being transmitted to vein image acquisition device 4, and vein image acquisition device 4 gathers finger
Vein image and vein image is transmitted to processor.
6th step, the vein image collected to acquisition are analyzed, if obtaining intensity profile is adapted to finger vena figure
As image-left, then enter in next step, otherwise return to the 4th step.
7th step, microcontroller send the signal for being transmitted to left infrared light supply component 2 and left liquid crystal transmission board component 3, make a left side
Infrared light supply component 2 and left liquid crystal transmission board component 3 are closed；Intensity profile is obtained using the first step to the same method of the 6th step
Suitable finger venous image image-right.
8th step, microcontroller carry out finger venous image image-left and finger venous image image-right
Average value fusion method, final obtaining a secondary uniform gray level, the finger venous image of no speck.
Finally it should be noted that：Various embodiments above is only to illustrate the technical solution of the utility model, rather than it is limited
System；Although the utility model is described in detail with reference to foregoing embodiments, one of ordinary skill in the art should
Understand：It can still modify to the technical scheme described in foregoing embodiments, either to which part or whole
Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is departed from this practicality newly
The scope of each embodiment technical scheme of type, it all should cover among claim of the present utility model and the scope of specification.
Claims (7)
1. in-line light source finger vein image acquisition device, it is characterised in that saturating including shell, infrared light supply component, liquid crystal
Penetrate board component, vein image acquisition device and microcontroller；The upper surface of the shell is provided with the arch groove for being used for placing finger, arc
Face trench bottom is provided with loophole；The vein image acquisition device located at the enclosure and positioned at the loophole just under
Side；The infrared light supply component is provided with two and is distributed in the upper left side and upper right side of the shell, and then is formed described red
Outer light source component does not block the in-line infrared laser of the surface of the loophole and the transmitting of infrared light supply component along institute
State the structure of the fore-and-aft direction irradiation of loophole；The liquid crystal transmission board component is used located at the transmitting terminal of the infrared light supply component
In the intensity of illumination distribution of control in-line infrared laser；The microcontroller respectively with the vein image acquisition device, infrared
Light source assembly and liquid crystal transmission board component are electrically connected with.
2. in-line light source finger vein image acquisition device according to claim 1, it is characterised in that：The infrared light
Source component includes infrared light supply transmitter and the first circuit board for driving and controlling the infrared light supply transmitter, described
The emission port of infrared light supply transmitter is rectangle.
3. in-line light source finger vein image acquisition device according to claim 2, it is characterised in that：It is described infrared sharp
The fan-out angle for the yi word pattern laser that optical transmitting set is sent is 120 °, the folder of the optical plane launched and shell upper surface loophole
Angle is 60 ° or 120 °, and the projection width of in-line infrared laser is 2mm, wavelength 850nm, spectral bandwidth 5nm.
4. in-line light source finger vein image acquisition device according to claim 1, it is characterised in that：The liquid crystal is saturating
Penetrating board component includes multiple liquid crystal transmittance plate building-blocks, and the corresponding in-line of each liquid crystal transmittance plate building-blocks independent control
The photograph intensity distribution of infrared laser region.
5. in-line light source finger vein image acquisition device according to claim 4, it is characterised in that：Each liquid
Brilliant transmittance plate building-blocks include liquid crystal transmittance plate and the second circuit board for driving and controlling the liquid crystal transmittance plate.
6. in-line light source finger vein image acquisition device according to claim 5, it is characterised in that：The liquid crystal is saturating
Penetrate the emission port that plate is covered in the infrared light supply transmitter.
7. in-line light source finger vein image acquisition device according to claim 1, it is characterised in that：The loophole
Inside it is additionally provided with the indicator lamp for guided placement finger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720420922.7U CN206672127U (en) | 2017-04-20 | 2017-04-20 | In-line light source finger vein image acquisition device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720420922.7U CN206672127U (en) | 2017-04-20 | 2017-04-20 | In-line light source finger vein image acquisition device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206672127U true CN206672127U (en) | 2017-11-24 |
Family
ID=60375517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720420922.7U Expired - Fee Related CN206672127U (en) | 2017-04-20 | 2017-04-20 | In-line light source finger vein image acquisition device |
Country Status (1)
| Country | Link |
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| CN (1) | CN206672127U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107092885A (en) * | 2017-04-20 | 2017-08-25 | 重庆科技学院 | In-line light source finger vein image acquisition device and its acquisition method |
| CN109143793A (en) * | 2018-09-06 | 2019-01-04 | 重庆科技学院 | A kind of application method of adjustable chip fixture |
-
2017
- 2017-04-20 CN CN201720420922.7U patent/CN206672127U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107092885A (en) * | 2017-04-20 | 2017-08-25 | 重庆科技学院 | In-line light source finger vein image acquisition device and its acquisition method |
| CN107092885B (en) * | 2017-04-20 | 2023-08-22 | 重庆科技学院 | Linear light source finger vein image acquisition device and acquisition method thereof |
| CN109143793A (en) * | 2018-09-06 | 2019-01-04 | 重庆科技学院 | A kind of application method of adjustable chip fixture |
| CN109143793B (en) * | 2018-09-06 | 2023-06-06 | 重庆科技学院 | Use method of adjustable chip clamp |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190114 Address after: 430000 Block A, 1610, Guanggu Central Garden, Northwest corner of Luxiang Square, Luoyu Road, Donghu New Technology Development Zone, Wuhan City, Hubei Province Patentee after: Hubei Tai Mingruo Intelligent Technology Co., Ltd. Address before: No. 20, East Road, University City, Chongqing, Shapingba District, Chongqing Patentee before: Chongqing University of Science & Technology |
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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: 20171124 Termination date: 20200420 |