CN106339689A - Finger and palm print image collection device - Google Patents
Finger and palm print image collection device Download PDFInfo
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- CN106339689A CN106339689A CN201610769014.9A CN201610769014A CN106339689A CN 106339689 A CN106339689 A CN 106339689A CN 201610769014 A CN201610769014 A CN 201610769014A CN 106339689 A CN106339689 A CN 106339689A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
- G06V40/12—Fingerprints or palmprints
- G06V40/13—Sensors therefor
- G06V40/1324—Sensors therefor by using geometrical optics, e.g. using prisms
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- Optics & Photonics (AREA)
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- General Physics & Mathematics (AREA)
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- Theoretical Computer Science (AREA)
- Image Input (AREA)
- Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
Abstract
The invention provides a finger and palm print image collection device which comprises an LED backlight source, a collection prism, a first reflector, a second reflector, an imaging lens, a CMOS photovoltaic converter, a USB data line and a collector body. The collection prism is a isosceles rectangular prism, and arranged in a collection window position of the collector body, the first reflector, the second reflector, the imaging lens and the CMOS photovoltaic converter are arranged in an optical axis of a system sequentially, light emitted by an image output surface of the prism is reflected by the first reflector and then converted into incident light of the second reflector, the incident light is reflected by the second reflector and changed into emergent light, the emergent light is received by the imaging lens, and the CMOS photovoltaic converter is arranged in the image plane of the imaging lens. The collection device support half-palm (namely the palm portion except fingers) collection, left/right four-fingers and double-thumb planar fingerprint collection and single-finger rolling collection, the collecting precision and efficiency are improved greatly, and via complex optical path design, the anti-interference capability against ambient light of the collection device reaches 100% approximately.
Description
Technical field
The present invention is a kind of fingers and palms print image acquisition method, also discloses the fingers and palms stricture of vagina collection being adapted with the method simultaneously
Device, belongs to finger palm print collecting device technical field.
Background technology
In recent years, fingerprint recognition plays more and more important role in field of authentication, and fingerprint recognition can be used for starting shooting
Log in identity validation, the access rights in remote network data storehouse and the confirmation of identity, bank savings is anti-impersonator and banking procedure where deposits and withdrawals are processed at any branch bank
Encryption method, the identity validation of insurance industry people from China National Investment ＆ Guaranty Corp., the identity validation of futures security withdrawer, the health system traditional Chinese medical science
Treat identity validation of the insurer etc..Obtain accurate and good resolution image to be just particularly important, if fingerprint letter
Breath is bad, is misidentified, then by on-the-spot testing, arises that and the fraud such as pretends to be, causes damage.At present, on market
The fingerprint quality of fingerprint acquisition device collection is affected very greatly, even to gather fingerprint under the conditions of direct sunlight by ambient light.
Content of the invention
The present invention provides one kind to refer to palmprint image collecting device, substantially increases the capacity of resisting disturbance to ambient light, overcomes
Existing same type harvester cannot in the defect of normal work under strong illumination.
One kind of the present invention refers to palmprint image collecting device, mainly by led backlight, Collection prism, the first reflection
Mirror, the second reflecting mirror, imaging lens, cmos optical-electrical converter, usb data wire and harvester body are constituted；Collection prism be etc.
Waist corner cube prism, is arranged at the acquisition window of harvester body, including light entrance face, collection face, image output face, gathers rib
As collection face, at fingerprint collecting window, the right-angle surface near picker side is light entrance face, opposite side on the inclined-plane of mirror
Right-angle surface is image output face, and collection face is 45 ° ~ 50 ° with the angle of image output face；Led backlight enters positioned at Collection prism
Penetrate face side, provide illumination light for system；Camera lens optical axis are parallel with prism light entrance face, and pass through collection face center, and first is anti-
Penetrate mirror range image output face about 162mm, and with 55.5 ° of optical axis included angle, second reflecting mirror distance the first reflecting mirror 128mm, and
With 67.5 ° of optical axis included angle, imaging lens are arranged at Collection prism output face 380 ~ 280 mm distance, the first reflecting mirror and
Two-mirror surface is medium high-reflecting film of aluminizing, centre wavelength 525 nm, and reflectance is more than 93%；First reflecting mirror, the second reflection
Mirror, imaging lens, the order arrangement of cmos optical-electrical converter are located on systematic optical axis；By the light of prism image output face outgoing,
It is changed into the incident ray of the second reflecting mirror after the first reflecting mirror reflection, this incident ray is changed into after reflecting via the second reflecting mirror
Emergent ray, is received by imaging lens, and cmos optical-electrical converter is arranged in the image planes of imaging lens.
Cmos optical-electrical converter is mainly by usb control chip, PLD cpld, colored cmos chip and caching
Chip fifo is constituted；
Usb pass through io port by reset_bar_in signal, start signal, ifclk signal, int1 signal, flagc signal and
Slwr signal is connected with the io port of cpld, and the FPDP data_usb of usb is also connected to the io port of cpld；Usb controls
Chip is passed through i2c port and is connected with colored cmos chip, and usb control chip is joined to colored cmos chip by i2c port
Put；
Cpld chip passes through output port by reset_bar signal and extclk signal transmission to colored cmos chip, to colour
Cmos is resetted；By row signal lv, field signal fv, data sync clock signal pclk and view data data_sensor with
The input port of cpld connects；
Cpld pass through the wrst signal of io port and fifo, we signal, wck signal, rrst signal, re signal, rck signal,
Ordy signal, in_usb data, out_bus data cube computation, view data in_usb that colored cmos is transmitted is written to
Kept in fifo；The view data storing in fifo is passed through out_bus port transmission to cpld, cpld passes through again
View data is transferred to usb control chip by data_usb port.
After electricity on Acquisition Instrument, led backlight is bright, represents light source normal work；According to hand-type sign, use
Family need by corresponding palmmprint, left hand four refers to, the right hand four refers to, double thumb, each refer to singly referring to be placed on collection face and carrying out figure of position
As collection；Fingerprint signal on the collection face of being pressed against enters colored cmos chip through light path, on cmos optical-electrical converter, first
First usb control chip is configured, make it be operated in bulk transfer mode；Next usb control chip is supplied to by io
Required signal when cpld, external fifo, colored cmos chip operation；Then usb control chip passes through i2c interface to coloured silk
Color cmos chip register is configured, including to information such as acquisition window size, acquisition window starting point, time of exposure, gains
Setting, setting completed, and colored cmos chip is started working；Cpld passes through signal that colored cmos chip provides by colored cmos
The view data of chip is input in external fifo enters row cache, then the status signal that provided by usb control chip and external
View data in external fifo is transferred to host computer, through splicing, the tune of upper computer software by the status signal that fifo provides
The relevant treatment such as whole shows complete fingerprint image.
The present invention is by being designed so that entering the critical environment light light warp of Collection prism to Collection prism, operating distance
After collection face and image output face are turned back, do not received by the effective clear aperature of camera lens, therefore avoid ambient light and fingerprint is become
The impact of picture.Specific method for designing is as follows:
According to the law of refraction:
Sin (i) * n=sin (i ') * n ' (1)
I is angle of incidence, and n is incident medium refractive index, and i ' is the angle of emergence, and n ' is emergent medium refractive index.
Critical environment light is approximately equal to 90 ° by the angle of incidence that air enters prism, that is, i1=90 °, can according to formula (1)
Obtain the refraction angle i1 ' behind the acquired face of ambient light,
I1 '=arcsin(n air/n prism) (2)
Critical environment light continues to propagate in the prism behind collection face, occurs to turn back for the second time in image output face, corresponding
The light angle of emergence is i2 ', is had according to the law of refraction:
Sin (i1 '-α) * n prism=n air * sin (i2 ') (3)
In formula (3), α is the angle in collection face and image output face, and in the present invention, α can be any one angle between 45 ° ~ 50 °
Degree.Formula (2) is brought into formula (3) angle of emergence i2 in image output face for the critical environment light can be obtained ',
I2 '=arcsin(sin (arcsin(n air/n prism)-α))/n air (4)
45 ° ~ 50 ° of α angle of the present invention span, corresponding i2 ' is 8.9 ° ~ 11.9 °.Ambient light is stronger, the fingerprint contrast collecting
Degree is poorer, in order to avoid the impact to fingerprint imaging for the ambient light, the ambient light according to i2 ' outgoing should be made ineffective by camera lens
Clear aperture is received, and corresponding imaging lens installation site is not less than at 380 ~ 280 mm away from output prism surface.Due to from other
Any direction injects the ambient light of prism, is all higher than i2 ' (8.9 ° ~ 11.9 °) at the refraction angle of image output face, therefore protects
Demonstrate,prove imaging lens and do not receive all ambient lights.
Led backlight is visible ray monochrome led area source, centre wavelength 525 nm, and the light that led backlight sends leads to
Cross light entrance face to be irradiated on collection face, based on the total reflection principle of light, fingerprint ridge line and valley line form stronger contrast, phase
Answer image to be exported by image output face, and enter imaging lens after turning back twice through the first reflecting mirror and the second reflecting mirror, finally
It is imaged on cmos optical-electrical converter.Whole imaging system introduces two panels reflecting mirror and carries out two secondary reflections to light it is achieved that right
Making full use of of structure space, substantially reduces the volume of product.
The present invention has the active effect that the impact that can avoid ambient light to fingerprint imaging, so that harvester is obtained high-quality
The fingerprint image of amount；This harvester supports half to slap (i.e. palm portion in addition to finger) collection, left and right four refers to and double thumb mould
Formula plane fingerprint collecting, singly refer to roll collection, substantially increase acquisition precision and efficiency, also improve the essence of fingerprint recognition simultaneously
Degree；Employ the scheme that cpld coordinates high speed fifo, reach the maximum transmission rate of usb interface.
Brief description
Fig. 1 is optical system schematic diagram of the present invention；
Fig. 2 is the circuit theory diagrams of the present invention；
In figure, 1, led backlight；2nd, Collection prism；3rd, the first reflecting mirror；4th, the second reflecting mirror；5th, imaging lens；6、cmos
Optical-electrical converter；7th, usb data wire；8th, harvester body.
Specific embodiment
As shown in figure 1, by led backlight 1, Collection prism 2, the first reflecting mirror 3, the second reflecting mirror 4, imaging lens 5,
Cmos optical-electrical converter 6, usb data wire 7, harvester body 8 composition refer to palmprint image collecting device.Wherein, led backlight 1
It is fixed on the right-angle side light entrance face of Collection prism 1, provide illumination for system, function simultaneously as fingers and palms print image background；First is anti-
Penetrate mirror 3 and the second reflecting mirror 4 to carry out fixation is installed according to the minimum principle of volume after making optical mechanical system turn back；Imaging lens 5,
Cmos optical-electrical converter 6 is centrally located on systematic optical axis.The light that led backlight 1 sends is irradiated to by light entrance face to be adopted
On collection face, based on the total reflection principle of light, fingerprint ridge line and valley line form stronger contrast, and respective image is by image output face
Output, and enter imaging lens 5 after turning back twice through the first reflecting mirror 3 and the second reflecting mirror 4, finally it is imaged on cmos photoelectricity and turn
On parallel operation 6.
As shown in Fig. 2 circuit of the present invention is mainly by usb control chip, PLD cpld, colored cmos chip
Constitute with cache chip fifo.Wherein usb control chip mainly realizes the configuration to colored cmos chip, and view data is passed
It is defeated by computer；The complete transmission of PLD cpld major control view data；Colored cmos chip is mainly realized
The collection of image；Cache chip fifo mainly realizes the temporary transient storage of view data.
Usb passes through io port to be believed reset_bar_in signal, start signal, ifclk signal, int1 signal, flagc
Number and slwr signal be connected with the io port of cpld, the FPDP data_usb of usb is also connected to the io port of cpld.Wherein
Reset_bar_in signal is the reset signal before colored cmos chip normal work, and start signal is to start cpld work
Commencing signal, ifclk signal is the clock signal that usb chip is given, and int1 signal is the external interrupt signal of usb, flagc
Signal is the Status Flag signal that usb is given, and controls the transmission of data according to this Status Flag signal cpld, and slwr is
The enable signal of usb chip data transmission, situation about allowing as usb, slwr signal is enabled by cpld, and view data is passed through
Data_usb port transmission is to usb control chip.
Usb control chip is passed through i2c port and is connected with colored cmos chip, and usb control chip passes through i2c port to colour
Cmos chip is configured, including the setting to information such as acquisition window size, acquisition window starting point, time of exposure, gains.
Cpld chip passes through output port by reset_bar signal and extclk signal transmission to colored cmos chip, its
Middle reset_bar signal is the colored cmos chip reset signal that usb is given, and why passes through cpld chip, is because that usb is defeated
The reset_bar_in signal voltage going out is 3.3v, and the working signal voltage of colored cmos chip is 1.8v, so passing through
The reset_bar signal that the reset_bar_in signal of 3.3v is reduced to 1.8v is carried out multiple by cpld chip to colored cmos chip
Position；Extclk signal is the input clock signal of colored cmos chip, is cpld by getting to ifclk signal blood pressure lowering.When
During colored cmos chip normal work, by row signal lv, field signal fv, data sync clock signal pclk and view data
Data_sensor is connected with the input port of cpld.
Cpld is by the wrst signal of io port and fifo, we signal, wck signal, rrst signal, re signal, rck letter
Number, ordy signal, in_usb data, out_bus data cube computation.Wherein wrst signal and rrst signal are that cpld is transferred to fifo
The write address reset signal of chip and reading address reset signal；We signal is the write enable signal of fifo, when we signal is effective,
Cpld controls view data in_usb transmitting colored cmos chip to be written in fifo to be kept in；Wck is
The write clock signal of fifo, the data being often written in fifo is all synchronized with wck；Re signal is that the reading of fifo enables letter
Number, rck is the read clock signal of fifo, and ordy is the status signal that fifo is given, and when conditions permit, re signal is made by cpld
Can, and the view data storing in fifo is passed through out_bus port transmission to cpld, cpld passes through data_usb port again will
View data is transferred to usb control chip.
Claims (1)
1. one kind refer to palmprint image collecting device it is characterised in that:
By led backlight, Collection prism, the first reflecting mirror, the second reflecting mirror, imaging lens, cmos optical-electrical converter, usb number
Constitute according to line and harvester body；Collection prism is isosceles right-angle prism, is arranged at the acquisition window of harvester body, including
Light entrance face, collection face, image output face, the inclined-plane of Collection prism as collection face, at fingerprint collecting window, near adopting
As light entrance face, opposite side right-angle surface is image output face to the right-angle surface integrating person side, the angle of collection face and image output face
For 45 ° ~ 50 °；Led backlight is located at Collection prism plane of incidence side, provides illumination light for system；Camera lens optical axis are entered with prismatic light
Face of penetrating is parallel, and passes through collection face center, the first reflecting mirror range image output face about 162mm, and with 55.5 ° of optical axis included angle,
Second reflecting mirror distance the first reflecting mirror 128mm, and with 67.5 ° of optical axis included angle, imaging lens are arranged on away from Collection prism output
At the mm distance of face 380 ~ 280, the first reflecting mirror and the second mirror surface are medium high-reflecting film of aluminizing, centre wavelength 525 nm,
Reflectance is more than 93%；Anti- first reflecting mirror, the second reflecting mirror, imaging lens, the order arrangement of cmos optical-electrical converter are located at system
On optical axis；By the light of prism image output face outgoing, it is changed into the incident ray of the second reflecting mirror after the first reflecting mirror reflection,
This incident ray is changed into emergent ray after reflecting via the second reflecting mirror, is received by imaging lens, and cmos optical-electrical converter is arranged
In the image planes of imaging lens；
Cmos optical-electrical converter is mainly by usb control chip, PLD cpld, colored cmos chip and cache chip
Fifo is constituted；
Usb pass through io port by reset_bar_in signal, start signal, ifclk signal, int1 signal, flagc signal and
Slwr signal is connected with the io port of cpld, and the FPDP data_usb of usb is also connected to the io port of cpld；Usb controls
Chip is passed through i2c port and is connected with colored cmos chip, and usb control chip is joined to colored cmos chip by i2c port
Put；
Cpld chip passes through output port by reset_bar signal and extclk signal transmission to colored cmos chip, to colour
Cmos is resetted；By row signal lv, field signal fv, data sync clock signal pclk and view data data_sensor with
The input port of cpld connects；
Cpld pass through the wrst signal of io port and fifo, we signal, wck signal, rrst signal, re signal, rck signal,
Ordy signal, in_usb data, out_bus data cube computation, view data in_usb that colored cmos is transmitted is written to
Kept in fifo；The view data storing in fifo is passed through out_bus port transmission to cpld, cpld passes through again
View data is transferred to usb control chip by data_usb port.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610769014.9A CN106339689A (en) | 2016-08-31 | 2016-08-31 | Finger and palm print image collection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610769014.9A CN106339689A (en) | 2016-08-31 | 2016-08-31 | Finger and palm print image collection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106339689A true CN106339689A (en) | 2017-01-18 |
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ID=57822756
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610769014.9A Pending CN106339689A (en) | 2016-08-31 | 2016-08-31 | Finger and palm print image collection device |
Country Status (1)
| Country | Link |
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| CN (1) | CN106339689A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106960194A (en) * | 2017-03-24 | 2017-07-18 | 徐晨 | A kind of vein identification device |
| CN110008805A (en) * | 2017-12-21 | 2019-07-12 | 乐金显示有限公司 | Fingerprint recognition system and the method for sensing fingerprint using the fingerprint recognition system |
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|---|---|---|---|---|
| CN1292539A (en) * | 2000-10-31 | 2001-04-25 | 中国科学院上海光学精密机械研究所 | Fingerprint image display and collecting device |
| CN1445717A (en) * | 2002-03-14 | 2003-10-01 | 美国光撷科技有限公司 | Micro-optical fingerprint sensor and method for imaging fingerprint |
| CN101604389A (en) * | 2009-07-17 | 2009-12-16 | 长春鸿达光电子与生物统计识别技术有限公司 | A kind of fingerprint image of four fingers acquisition method and device |
| CN201498007U (en) * | 2009-06-25 | 2010-06-02 | 格林比特（天津）生物信息技术有限公司 | Hybrid fingerprint and palm print acquisition instrument |
| CN201556215U (en) * | 2009-06-25 | 2010-08-18 | 格林比特（天津）生物信息技术有限公司 | Double-reflection fingerprint acquisition instrument |
| CN202486805U (en) * | 2012-02-19 | 2012-10-10 | 东莞市中控电子技术有限公司 | Large-collecting-face fingerprint collecting device |
-
2016
- 2016-08-31 CN CN201610769014.9A patent/CN106339689A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1292539A (en) * | 2000-10-31 | 2001-04-25 | 中国科学院上海光学精密机械研究所 | Fingerprint image display and collecting device |
| CN1445717A (en) * | 2002-03-14 | 2003-10-01 | 美国光撷科技有限公司 | Micro-optical fingerprint sensor and method for imaging fingerprint |
| CN201498007U (en) * | 2009-06-25 | 2010-06-02 | 格林比特（天津）生物信息技术有限公司 | Hybrid fingerprint and palm print acquisition instrument |
| CN201556215U (en) * | 2009-06-25 | 2010-08-18 | 格林比特（天津）生物信息技术有限公司 | Double-reflection fingerprint acquisition instrument |
| CN101604389A (en) * | 2009-07-17 | 2009-12-16 | 长春鸿达光电子与生物统计识别技术有限公司 | A kind of fingerprint image of four fingers acquisition method and device |
| CN202486805U (en) * | 2012-02-19 | 2012-10-10 | 东莞市中控电子技术有限公司 | Large-collecting-face fingerprint collecting device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106960194A (en) * | 2017-03-24 | 2017-07-18 | 徐晨 | A kind of vein identification device |
| CN110008805A (en) * | 2017-12-21 | 2019-07-12 | 乐金显示有限公司 | Fingerprint recognition system and the method for sensing fingerprint using the fingerprint recognition system |
| CN110008805B (en) * | 2017-12-21 | 2023-06-09 | 乐金显示有限公司 | Fingerprint recognition system and method for sensing fingerprint using the same |
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Application publication date: 20170118 |