CN106156763A - A kind of fingerprint identification module and fingerprint identification method - Google Patents
A kind of fingerprint identification module and fingerprint identification method Download PDFInfo
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- CN106156763A CN106156763A CN201610675857.2A CN201610675857A CN106156763A CN 106156763 A CN106156763 A CN 106156763A CN 201610675857 A CN201610675857 A CN 201610675857A CN 106156763 A CN106156763 A CN 106156763A
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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
- G06V40/1306—Sensors therefor non-optical, e.g. ultrasonic or capacitive sensing
-
- 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
- G06V40/1347—Preprocessing; Feature extraction
-
- 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
- G06V40/1347—Preprocessing; Feature extraction
- G06V40/1359—Extracting features related to ridge properties; Determining the fingerprint type, e.g. whorl or loop
Abstract
The invention discloses a kind of fingerprint identification module and fingerprint identification method, described fingerprint identification module includes fingerprint collecting circuit, compensates circuit, noise suppression circuit, integral operation circuit, D/A converting circuit and controller；The outfan of described fingerprint collecting circuit is node A, and be connected with the input of integral operation circuit, the outfan of integral operation circuit is connected with the fingerprint input of controller by D/A converting circuit, the outfan of described compensation circuit is connected with the compensation end of fingerprint collecting circuit, it compensates control end and is connected with the compensation circuit control end of controller, the test signal output part of described noise suppression circuit is connected with node A, and its test control end controls end with the noise testing of controller and is connected.The present invention can amplify fingerprint valley signal and the signal difference of fingerprint ridge signal by compensating circuit, eliminates the fingerprint noise in circuit also by noise suppression circuit, to realize more precisely identifying fingerprint.
Description
Technical field
The present invention relates to fingerprint recognition field, especially a kind of charge transfer type fingerprint identification module, and refer to based on this
The fingerprint identification method of stricture of vagina identification module.
Background technology
Fingerprint, owing to it has unchangeable property, uniqueness and convenience, the most almost becomes the code name of living things feature recognition
Word.Fingerprint recognition i.e. refers to be differentiated by the details of relatively different fingerprints.Fingerprint identification technology relates at image
Numerous subjects such as reason, pattern recognition, computer vision, mathematical morphology, wavelet analysis.Owing to everyone fingerprint is different, just
It is that between ten fingers of same people, fingerprint is also clearly distinguished from, and therefore fingerprint can be used for identity authentication.Orientation due to each stamp
As Bu Wanquan, impetus difference can bring deformation in various degree, there is again a large amount of fuzzy fingerprint, the most correctly extracts feature
Coupling correct with realization, is the key of fingerprint identification technology.
Summary of the invention
The goal of the invention of the present invention is: for the problem of above-mentioned existence, it is provided that a kind of charge transfer type fingerprint recognition mould
Block, amplifies fingerprint valley signal and the signal difference of fingerprint ridge signal by compensating circuit, eliminates electricity also by noise suppression circuit
Fingerprint noise in road, to realize more precisely identifying fingerprint.The invention allows for a kind of fingerprint identification method.
The technical solution used in the present invention is as follows: a kind of fingerprint identification module, including fingerprint collecting circuit, compensate circuit,
Noise suppression circuit, integral operation circuit, D/A converting circuit and controller；The outfan of described fingerprint collecting circuit is node
A, and be connected with the input of integral operation circuit, the outfan of integral operation circuit is by D/A converting circuit and controller
Fingerprint input connect, the outfan of described compensation circuit is connected with the compensation end of fingerprint collecting circuit, its compensate control end and
The compensation circuit of controller controls end and connects, and the test signal output part of described noise suppression circuit is connected with node A, its test
Control end to be connected with the noise testing control end of controller.
Based on above-described embodiment, further, fingerprint collecting circuit of the present invention includes the first signal source, external electrical
Pole, detection sensor and isolation electrode, the power end of described outer electrode and the first signal source connect, and its outfan passes with detection
The first input end of sensor connects, and the second input of described detection sensor is connected with the outfan isolating electrode, described every
The input of ionization electrode is connected with the compensation end of fingerprint collecting circuit, and the outfan of described detection sensor is connected with node A.
Based on any of the above-described embodiment, further, compensation circuit of the present invention includes voltage buffer and compensates letter
Number source, the input of described voltage buffer is connected with the outfan compensating signal source, the output of its outfan and compensation circuit
End connects, and the end that controls of described compensation signal source is connected with the compensation circuit control end of controller.
Based on any of the above-described embodiment, further, voltage buffer of the present invention includes buffer amplifier, voltage control
Device processed, level displacement shifter, error feedback circuit and continuous current source.
First end of described voltage controller is connected with working power end VDD, its second end and the first of buffer amplifier
End connects, and its 3rd end is connected with the second end of buffer amplifier by level displacement shifter.
Second end of described buffer amplifier is also connected with the input Vin of voltage buffer, and its 3rd end delays with voltage
The output end vo ut rushing device connects.
First end in described continuous current source and the three-terminal link of buffer amplifier, its second end is by error feedback electricity
Road is connected with the input Vin of voltage buffer, its 3rd end with simulation ground dock, its offset side access bias voltage Vb.
Based on any of the above-described embodiment, further, voltage buffer of the present invention includes PMOS M1, PMOS
M2, PMOS M3, PMOS M4, electric capacity C1 and electric capacity C2.
The drain electrode of described PMOS M1 is connected with working power end, and its source electrode is connected with the drain electrode of PMOS M2, its grid
It is connected with the input of voltage buffer by electric capacity C1.
The grid of described PMOS M2 is connected with the input of voltage buffer, its source electrode and the outfan of voltage buffer
Connect.
The drain electrode of described PMOS M3 is connected with the outfan of voltage buffer, and its source electrode connects with the drain electrode of PMOS M4
Connecing, its grid is connected with biased electrical pressure side Vb3.
Also by the input of electric capacity C2 Yu voltage buffer between drain electrode and the source electrode of PMOS M3 of described PMOS M4
End connect, its source electrode with simulate dock, its grid is connected with biased electrical pressure side Vb4.
Based on any of the above-described embodiment, further, noise suppression circuit of the present invention includes secondary signal source and makes an uproar
Antihum condenser, the first end of described noise suppression capacitor is connected with node A, and its second end is connected with secondary signal source,
Its capacitance arranges the noise testing control end held with controller and is connected.
Based on any of the above-described embodiment, further, integral operation circuit of the present invention includes operational amplifier, feedback
Capacitor, electric capacity C3, resistance R1, resistance R2, resistance R3, zero potentiometer Rw, the 4th switch S4, the 5th switch S5 and benchmark letter
Number source.
The reverse input end of described operational amplifier is connected by the normal-closed end of resistance R1 and the 4th switch S4, and the described 4th
The first normally opened end of switch S4 is connected with the input of integral operation circuit, and the second normally opened end of described 4th switch S4 is right with ground
Connect；Described electric capacity C3 is connected in parallel between the reverse input end of operational amplifier and outfan, the outfan of described operational amplifier
It is connected with the reverse input end of operational amplifier also by resistance R3 and the 5th switch S5.
The positive input of described operational amplifier is connected with reference signal source by resistance R2；Described operational amplifier
Outfan is connected with the outfan of integral operation circuit；Zeroing electricity in parallel between the both positive and negative polarity of the zeroing end of described operational amplifier
Position device Rw；The running voltage positive pole of described operational amplifier is connected with running voltage end+Vc, its running voltage negative pole and work electricity
Pressure side-Vc connects；The end that controls of described zero potentiometer Rw is connected with the running voltage end-Vc of operational amplifier.
Based on any of the above-described embodiment, further, present invention additionally comprises the first switch S1, second switch S2 and the 3rd opens
Closing S3, described first switch is connected to fingerprint collecting circuit and compensates between circuit, and described second switch is connected to node A and finger
Between stricture of vagina Acquisition Circuit, described 3rd switch be connected between node A and noise suppression circuit, described first switch S1, second
The end that controls of switch S2 and the 3rd switch S3 is connected with the switch control terminal of controller respectively, receives corresponding on-off control letter
Number.
Based on any of the above-described embodiment, further, present invention additionally comprises the memorizer and communication being all connected with controller
Interface, described memorizer is used for storing finger print data, controlling parameter and/or control instruction, and described controller passes through communication interface
Data interaction is carried out with host computer.
The invention allows for a kind of fingerprint identification method, the method is based on the one described in any one of claim 1-9
Fingerprint identification module, said method comprising the steps of:
S1, electric charge resets step: before finger is not in contact with outer electrode, Guan Bi the first switch and second switch, disconnects the 3rd
Switch, further, for integral operation circuit, also needs to close the 5th switch, and the 4th switch is closed to the first normally opened end, will
Fingerprint collecting circuit, the electric charge compensated in circuit and integral operation circuit reset；
S2, noise detection step: disconnecting second switch, Guan Bi the 3rd switch, controller controls end to noise by noise testing
Suppression capacitor arranges initial capacitance value, secondary signal source output square-wave signal or sine wave signal, makes noise suppression capacitor
The quantity of electric charge that upper generation is predetermined, output noise detection signal, and by integral operation circuit and D/A converting circuit, noise is examined
Survey signal and be sent to controller, controller judge that whether this noise detecting signal is the one of the maximum range of digital to analog converter
Half, if it is not, then adjust the capacitance of noise suppression capacitor, until meeting this condition；
S3, fingerprint signal acquisition step: during finger contact outer electrode, Guan Bi the first switch, second switch, the 3rd switch, the
One signal source sends square-wave signal, is changed to fingerprint signal V1 to be measured, then passes with detection through outer electrode after outer electrode
Parasitic capacitance Cp1 between sensor is coupled to detect sensor, between detection sensor output outer electrode and isolation electrode
Charge difference signal；
S4, signal compensation step: the output of controller control and compensation circuit compensates signal V2, just changes in fingerprint signal V1 to be measured
Half-cycle signal and negative half-cycle signal, wherein, compensate the meansigma methods of the value that value is negative half-cycle signal of signal V2；
S5, noise suppressed step: secondary signal source output square-wave signal or sine wave signal, noise suppression capacitor produce pre-
The fixed quantity of electric charge, output noise suppression signal, the common-mode noise in suppression fingerprint signal；
S6, integral operation step: integral operation circuit receives the fingerprint signal V1 to be measured after compensation and noise suppression signal
Superposed signal, through the integration period length preset, exports fingerprint integrated signal；
S7, fingerprint integrated signal is carried out digital-to-analogue conversion, and is transmitted to controller by digital to analog converter, and controller is according to magnitude of voltage meter
Calculating the pixel image obtaining correspondence, the pixel image further according to each outer electrode generates the fingerprint image gathered.
In sum, owing to have employed technique scheme, the invention has the beneficial effects as follows: a kind of electricity that the present invention proposes
Lotus transfevent fingerprint identification module and fingerprint identification method, can amplify fingerprint valley signal and fingerprint ridge signal by compensating circuit
Signal difference, eliminates the fingerprint noise in circuit also by noise suppression circuit, to realize more precisely identifying fingerprint.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is the structured flowchart of fingerprint identification module of the present invention.
Fig. 2 is the circuit block diagram of voltage buffer in the present invention.
Fig. 3 is the circuit theory diagrams of voltage buffer in the present invention.
Fig. 4 is the circuit theory diagrams of integral operation circuit in the present invention.
Detailed description of the invention
All features disclosed in this specification, or disclosed all methods or during step, except mutually exclusive
Feature and/or step beyond, all can combine by any way.
Any feature disclosed in this specification (including any accessory claim, summary), unless specifically stated otherwise,
By other equivalences or there is the alternative features of similar purpose replaced.I.e., unless specifically stated otherwise, each feature is a series of
An example in equivalence or similar characteristics.
As it is shown in figure 1, Fig. 1 describes a kind of fingerprint identification module, mainly include fingerprint collecting circuit, compensation circuit, make an uproar
Sound suppression circuit, integral operation circuit, D/A converting circuit and controller.When gathering fingerprint signal, the present invention is by compensating
Circuit provides and compensates signal, amplifies fingerprint valley signal and the signal difference of fingerprint ridge signal that fingerprint collecting circuit is gathered, carries out
Charge compensation, improves the accuracy of fingerprint recognition, and improves the image quality of fingerprint image.The present invention presses down also by noise
Fingerprint noise in circuit for eliminating circuit processed, in order to filter the fingerprint noise in the fingerprint signal gathered, improve further
The accuracy of fingerprint recognition and image quality.
Wherein, the outfan of described fingerprint collecting circuit is node A, and is connected with the input of integral operation circuit, long-pending
The outfan dividing computing circuit is connected with the fingerprint input of controller by D/A converting circuit, the output of described compensation circuit
End is connected with the compensation end of fingerprint collecting circuit, and its compensation circuit control end compensating control end and controller is connected, described in make an uproar
The test signal output part of sound suppression circuit is connected with node A, and its test control end controls end even with the noise testing of controller
Connect.
Based on above-described embodiment, further, fingerprint collecting circuit of the present invention includes the first signal source, external electrical
Pole, detection sensor and isolation electrode, the power end of described outer electrode and the first signal source connect, and its outfan passes with detection
The first input end of sensor connects, and the second input of described detection sensor is connected with the outfan isolating electrode, described every
The input of ionization electrode is connected with the compensation end of fingerprint collecting circuit, and the outfan of described detection sensor is connected with node A.
Based on any of the above-described embodiment, further, compensation circuit of the present invention includes voltage buffer and compensates letter
Number source, the input of described voltage buffer is connected with the outfan compensating signal source, the output of its outfan and compensation circuit
End connects, and the end that controls of described compensation signal source is connected with the compensation circuit control end of controller.
Based on any of the above-described embodiment, further, as in figure 2 it is shown, Fig. 2 describes the knot of voltage buffer in the present invention
Structure block diagram, described voltage buffer mainly include buffer amplifier, voltage controller, level displacement shifter, error feedback circuit and
Continuous current source.
Wherein, the first end of described voltage controller is connected with working power end VDD, its second end and buffer amplifier
First end connects, and its 3rd end is connected with the second end of buffer amplifier by level displacement shifter.
Second end of described buffer amplifier is also connected with the input Vin of voltage buffer, and its 3rd end delays with voltage
The output end vo ut rushing device connects.
First end in described continuous current source and the three-terminal link of buffer amplifier, its second end is by error feedback electricity
Road is connected with the input Vin of voltage buffer, its 3rd end with simulation ground dock, its offset side access bias voltage Vb.
Based on any of the above-described embodiment, further, as it is shown on figure 3, Fig. 3 describes in the present invention the one of voltage buffer
Kind of circuit theory diagrams, described voltage buffer can include PMOS M1, PMOS M2, PMOS M3, PMOS M4, electric capacity C1 and
Electric capacity C2.Wherein, PMOS M1 is equivalent to voltage controller, and PMOS M2 is equivalent to buffer amplifier, PMOS M3 and PMOS
Pipe M4 is equivalent to the continuous current source that a common source is deleted altogether, and electric capacity C1 is equivalent to level displacement shifter, and it is anti-that electric capacity C2 is equivalent to distortion
Current feed circuit.
The drain electrode of described PMOS M1 is connected with working power end, and its source electrode is connected with the drain electrode of PMOS M2, its grid
It is connected with the input of voltage buffer by electric capacity C1.
The grid of described PMOS M2 is connected with the input of voltage buffer, its source electrode and the outfan of voltage buffer
Connect.
The drain electrode of described PMOS M3 is connected with the outfan of voltage buffer, and its source electrode connects with the drain electrode of PMOS M4
Connecing, its grid is connected with biased electrical pressure side Vb3.
Also by the input of electric capacity C2 Yu voltage buffer between drain electrode and the source electrode of PMOS M3 of described PMOS M4
End connect, its source electrode with simulate dock, its grid is connected with biased electrical pressure side Vb4.
Based on any of the above-described embodiment, further, noise suppression circuit of the present invention includes secondary signal source and makes an uproar
Antihum condenser, the first end of described noise suppression capacitor is connected with node A, and its second end is connected with secondary signal source,
Its capacitance arranges the noise testing control end held with controller and is connected.
Based on any of the above-described embodiment, further, as shown in Figure 4, integral operation circuit of the present invention includes computing
Amplifier, feedback condenser, electric capacity C3, resistance R1, resistance R2, resistance R3, zero potentiometer Rw, the 4th switch S4, the 5th open
Close S5 and reference signal source.
The reverse input end of described operational amplifier is connected by the normal-closed end of resistance R1 and the 4th switch S4, and the described 4th
The first normally opened end of switch S4 is connected with the input of integral operation circuit, and the second normally opened end of described 4th switch S4 is right with ground
Connect；Described electric capacity C3 is connected in parallel between the reverse input end of operational amplifier and outfan, the outfan of described operational amplifier
It is connected with the reverse input end of operational amplifier also by resistance R3 and the 5th switch S5.
The positive input of described operational amplifier is connected with reference signal source by resistance R2；Described operational amplifier
Outfan is connected with the outfan of integral operation circuit；Zeroing electricity in parallel between the both positive and negative polarity of the zeroing end of described operational amplifier
Position device Rw；The running voltage positive pole of described operational amplifier is connected with running voltage end+Vc, its running voltage negative pole and work electricity
Pressure side-Vc connects；The end that controls of described zero potentiometer Rw is connected with the running voltage end-Vc of operational amplifier.
Close the 4th switch normally opened end of S4 to second, Guan Bi the 5th switch S5, integral operation circuit is carried out weakening and tune
Zero, it is then turned off the 5th switch S5, adjusts zero potentiometer Rw, control the output time of operational amplifier, general, reduce fortune
Calculating the output time of amplifier, the output making operational amplifier is the slowest over time.Retell the 4th switch S4 and first
Normally opened end connects, and controller gathers the output voltage Vo1 of operational amplifier, after certain time, then by the 4th switch S4 and the
Two normally opened end Guan Bis, gather the output voltage Vo2 of operational amplifier, according to output voltage Vo1 and output voltage Vo2, it is judged that long-pending
Divide the voltage holding capability of computing circuit, if the retention time is less than predetermined threshold value, then continue to adjust zero potentiometer Rw it is known that protect
Time of holding, more than or equal to till predetermined threshold value, makes one high linearity of holding of integral operation circuit, the shape of low drifting with this
State.
Based on any of the above-described embodiment, further, present invention additionally comprises the first switch S1, second switch S2 and the 3rd opens
Closing S3, described first switch is connected to fingerprint collecting circuit and compensates between circuit, and described second switch is connected to node A and finger
Between stricture of vagina Acquisition Circuit, described 3rd switch be connected between node A and noise suppression circuit, described first switch S1, second
The end that controls of switch S2 and the 3rd switch S3 is connected with the switch control terminal of controller respectively, receives corresponding on-off control letter
Number.
Based on any of the above-described embodiment, further, present invention additionally comprises the memorizer and communication being all connected with controller
Interface, described memorizer is used for storing finger print data, controlling parameter and/or control instruction, and described controller passes through communication interface
Data interaction is carried out with host computer.
The operation principle of the present invention: arrange multiple outer electrode on the finger contact surface of fingerprint identification module, forms one
Electrod-array, when finger contact fingerprint identification module, outer electrode gathers the fingerprint signal of finger, including fingerprint valley signal and
Fingerprint ridge signal, and owing to fingerprint valley is different from the height of fingerprint ridge, cause fingerprint valley signal different with fingerprint ridge signal, fingerprint
The difference of paddy signal and fingerprint ridge signal is the most different.
The present invention specifically includes following multiple step:
S1, electric charge resets step: before finger is not in contact with outer electrode, Guan Bi the first switch and second switch, disconnects the 3rd
Switch, further, for integral operation circuit, also needs to close the 5th switch, and the 4th switch is closed to the first normally opened end, will
Fingerprint collecting circuit, the electric charge compensated in circuit and integral operation circuit reset.
S2, noise detection step: disconnect second switch, Guan Bi the 3rd switch, controller controls end by noise testing and gives
Noise suppression capacitor arranges initial capacitance value, secondary signal source output square-wave signal or sine wave signal, makes noise suppressed electricity
Produce the predetermined quantity of electric charge, output noise detection signal on container, and will be made an uproar by integral operation circuit and D/A converting circuit
Sound detection signal is sent to controller, controller judge that whether this noise detecting signal is the maximum range of digital to analog converter
Half, if it is not, then adjust the capacitance of noise suppression capacitor, until meeting this condition.
S3, fingerprint signal acquisition step: during finger contact outer electrode, Guan Bi the first switch, second switch, the 3rd open
Closing, the first signal source sends square-wave signal, is changed to fingerprint signal V1 to be measured after outer electrode, then through outer electrode and inspection
Survey parasitic capacitance Cp1 between sensor be coupled to detect sensor, detection sensor output outer electrode and isolation electrode it
Between charge difference signal.
S4, signal compensation step: the output of controller control and compensation circuit compensates signal V2, changes in fingerprint signal V1 to be measured
Positive half-cycle signal and negative half-cycle signal, wherein, compensate the meansigma methods of the value that value is negative half-cycle signal of signal V2 so that
When compensating signal V2 and being coupled to isolate electrode, in the fingerprint signal V1 to be measured that detection sensor is exported, negative half-cycle signal
Value approximates zero.
Owing to finger is when contacting outer electrode, not only make the parasitic capacitance between outer electrode and detection sensor
Cp1 changes, and finger also corresponds to a noise source and introduces noise into subsequent conditioning circuit, thus the identification to fingerprint produces shadow
Ring, it is impossible to identify correct fingerprint image, therefore, when processing fingerprint signal, the fingerprint that fingerprint signal is introduced need to be eliminated
Noise.
S5, noise suppressed step: secondary signal source output square-wave signal or sine wave signal, noise suppression capacitor produces
The raw predetermined quantity of electric charge, output noise suppression signal, the common-mode noise in suppression fingerprint signal.
S6, integral operation step: integral operation circuit receives the fingerprint signal V1 to be measured after compensation and noise suppressed letter
Number superposed signal, through presetting integration period length, export fingerprint integrated signal.
S7, fingerprint integrated signal is carried out digital-to-analogue conversion, and is transmitted to controller by digital to analog converter, and controller is according to voltage
Value is calculated the pixel image of correspondence, and the pixel image further according to each outer electrode generates the fingerprint image gathered.
The present invention directly can export fingerprint image data by communication interface, also can be by the fingerprint image gathered and memorizer
In preset fingerprint image compare, by communication interface export corresponding authentication instruct.
The invention is not limited in aforesaid detailed description of the invention.The present invention expands to any disclose in this manual
New feature or any new combination, and the arbitrary new method that discloses or the step of process or any new combination.
Claims (10)
1. a fingerprint identification module, it is characterised in that: include fingerprint collecting circuit, compensate circuit, noise suppression circuit, integration
Computing circuit, D/A converting circuit and controller；The outfan of described fingerprint collecting circuit is node A, and electric with integral operation
The input on road connects, and the outfan of integral operation circuit is connected with the fingerprint input of controller by D/A converting circuit,
The outfan of described compensation circuit is connected with the compensation end of fingerprint collecting circuit, and it compensates the compensation circuit controlling end with controller
Controlling end to connect, the test signal output part of described noise suppression circuit is connected with node A, its test control end and controller
Noise testing controls end and connects.
2. based on a kind of fingerprint identification module described in claim 1, it is characterised in that: described fingerprint collecting circuit includes first
Signal source, outer electrode, detection sensor and isolation electrode, the power end of described outer electrode and the first signal source connect, its
Outfan is connected with the first input end of detection sensor, the second input of described detection sensor and the output isolating electrode
End connects, and the input of described isolation electrode is connected with the compensation end of fingerprint collecting circuit, the outfan of described detection sensor
It is connected with node A.
3. based on a kind of fingerprint identification module described in claim 1, it is characterised in that: described compensation circuit includes voltage buffer
Device and compensation signal source, the input of described voltage buffer is connected with the outfan compensating signal source, its outfan and compensation
The outfan of circuit connects, and the end that controls of described compensation signal source is connected with the compensation circuit control end of controller.
4. based on a kind of fingerprint identification module described in claim 3, it is characterised in that: described voltage buffer includes that buffering is put
Big device, voltage controller, level displacement shifter, error feedback circuit and continuous current source；
First end of described voltage controller is connected with working power end VDD, and its second end connects with the first end of buffer amplifier
Connecing, its 3rd end is connected with the second end of buffer amplifier by level displacement shifter；
Second end of described buffer amplifier is also connected with the input Vin of voltage buffer, its 3rd end and voltage buffer
Output end vo ut connect；
First end in described continuous current source and the three-terminal link of buffer amplifier, its second end by error feedback circuit with
The input Vin of voltage buffer connects, and docks to its 3rd end and simulation, its offset side access bias voltage Vb.
5. based on a kind of fingerprint identification module described in claim 3, it is characterised in that: described voltage buffer includes PMOS
M1, PMOS M2, PMOS M3, PMOS M4, electric capacity C1 and electric capacity C2；
The drain electrode of described PMOS M1 is connected with working power end, and its source electrode is connected with the drain electrode of PMOS M2, and its grid passes through
Electric capacity C1 is connected with the input of voltage buffer；
The grid of described PMOS M2 is connected with the input of voltage buffer, and its source electrode connects with the outfan of voltage buffer
Connect；
The drain electrode of described PMOS M3 is connected with the outfan of voltage buffer, and its source electrode is connected with the drain electrode of PMOS M4, its
Grid is connected with biased electrical pressure side Vb3；
Between drain electrode and the source electrode of PMOS M3 of described PMOS M4, the input also by electric capacity C2 with voltage buffer connects
Connect, its source electrode with simulation dock, its grid is connected with biased electrical pressure side Vb4.
6. based on a kind of fingerprint identification module described in claim 1, it is characterised in that: described noise suppression circuit includes second
Signal source and noise suppression capacitor, the first end of described noise suppression capacitor is connected with node A, its second end and the second letter
Number source connects, and its capacitance arranges end and is connected with the noise testing control end of controller.
7. based on a kind of fingerprint identification module described in claim 1, it is characterised in that: described integral operation circuit includes computing
Amplifier, feedback condenser, electric capacity C3, resistance R1, resistance R2, resistance R3, zero potentiometer Rw, the 4th switch S4, the 5th open
Close S5 and reference signal source；
The reverse input end of described operational amplifier is connected by the normal-closed end of resistance R1 and the 4th switch S4, described 4th switch
The first normally opened end of S4 is connected with the input of integral operation circuit, described 4th switch S4 the second normally opened end with dock；
Described electric capacity C3 is connected in parallel between the reverse input end of operational amplifier and outfan, and the outfan of described operational amplifier is the most logical
Cross resistance R3 and the 5th switch S5 to be connected with the reverse input end of operational amplifier；
The positive input of described operational amplifier is connected with reference signal source by resistance R2；The output of described operational amplifier
End is connected with the outfan of integral operation circuit；Zero potentiometer in parallel between the both positive and negative polarity of the zeroing end of described operational amplifier
Rw；The running voltage positive pole of described operational amplifier is connected with running voltage end+Vc, its running voltage negative pole and running voltage
End-Vc connects；The end that controls of described zero potentiometer Rw is connected with the running voltage end-Vc of operational amplifier.
8. based on a kind of fingerprint identification module described in claim 1, it is characterised in that: also include the first switch S1, second open
Closing S2 and the 3rd switch S3, described first switch is connected to fingerprint collecting circuit and compensates between circuit, and described second switch is even
Being connected between node A and fingerprint collecting circuit, described 3rd switch is connected between node A and noise suppression circuit, and described the
The end that controls of one switch S1, second switch S2 and the 3rd switch S3 is connected with the switch control terminal of controller respectively, receives corresponding
Switch controlling signal.
9. based on a kind of fingerprint identification module described in claim 1, it is characterised in that: also include that be all connected with controller deposits
Reservoir and communication interface, described memorizer is used for storing finger print data, controlling parameter and/or control instruction, and described controller leads to
Cross communication interface and carry out data interaction with host computer.
10. a fingerprint identification method, it is characterised in that described method refers to based on the one described in any one of claim 1-9
Stricture of vagina identification module, said method comprising the steps of:
S1, electric charge resets step: before finger is not in contact with outer electrode, Guan Bi the first switch and second switch, disconnects the 3rd
Switch, further, for integral operation circuit, also needs to close the 5th switch, and the 4th switch is closed to the first normally opened end, will
Fingerprint collecting circuit, the electric charge compensated in circuit and integral operation circuit reset；
S2, noise detection step: disconnecting second switch, Guan Bi the 3rd switch, controller controls end to noise by noise testing
Suppression capacitor arranges initial capacitance value, secondary signal source output square-wave signal or sine wave signal, makes noise suppression capacitor
The quantity of electric charge that upper generation is predetermined, output noise detection signal, and by integral operation circuit and D/A converting circuit, noise is examined
Survey signal and be sent to controller, controller judge that whether this noise detecting signal is the one of the maximum range of digital to analog converter
Half, if it is not, then adjust the capacitance of noise suppression capacitor, until meeting this condition；
S3, fingerprint signal acquisition step: during finger contact outer electrode, Guan Bi the first switch, second switch, the 3rd switch, the
One signal source sends square-wave signal, is changed to fingerprint signal V1 to be measured, then passes with detection through outer electrode after outer electrode
Parasitic capacitance Cp1 between sensor is coupled to detect sensor, between detection sensor output outer electrode and isolation electrode
Charge difference signal；
S4, signal compensation step: the output of controller control and compensation circuit compensates signal V2, just changes in fingerprint signal V1 to be measured
Half-cycle signal and negative half-cycle signal, wherein, compensate the meansigma methods of the value that value is negative half-cycle signal of signal V2；
S5, noise suppressed step: secondary signal source output square-wave signal or sine wave signal, noise suppression capacitor produce pre-
The fixed quantity of electric charge, output noise suppression signal, the common-mode noise in suppression fingerprint signal；
S6, integral operation step: integral operation circuit receives the fingerprint signal V1 to be measured after compensation and noise suppression signal
Superposed signal, through the integration period length preset, exports fingerprint integrated signal；
S7, fingerprint integrated signal is carried out digital-to-analogue conversion, and is transmitted to controller by digital to analog converter, and controller is according to magnitude of voltage meter
Calculating the pixel image obtaining correspondence, the pixel image further according to each outer electrode generates the fingerprint image gathered.
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