CN209182846U - A kind of fingerprint mould group of the identification function containing NFC - Google Patents
A kind of fingerprint mould group of the identification function containing NFC Download PDFInfo
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- CN209182846U CN209182846U CN201920215054.8U CN201920215054U CN209182846U CN 209182846 U CN209182846 U CN 209182846U CN 201920215054 U CN201920215054 U CN 201920215054U CN 209182846 U CN209182846 U CN 209182846U
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- nfc
- fingerprint
- identification function
- mould group
- microprocessor
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Abstract
This application discloses a kind of fingerprint mould groups of identification function containing NFC, are related to the safety-security areas such as smart home smart lock, Fingerprint Lock, gate inhibition.The fingerprint mould group of the identification function provided by the present application containing NFC, comprising: NFC microprocessor, fingerprint algorithm chip and fingerprint sensor；The fingerprint sensor is connect with the fingerprint algorithm chip, the fingerprint algorithm chip is connect with the NFC microprocessor, the NFC microprocessor is communicated by artificial antenna interface with contact type intelligent card, and the NFC microprocessor is communicated by digital interface with external host computer.Using the fingerprint mould group of the identification function provided by the present application containing NFC, so that the identification of fingerprint recognition, NFC card reading and NFC mobile phone identification function integration, enrich the product form of safety-security area.
Description
Technical field
The utility model relates to the safety-security areas such as smart home smart lock, Fingerprint Lock, gate inhibition, more particularly to one kind to contain NFC
The fingerprint mould group of identification function enriches the product of the applications such as fingerprint recognition, the identification of NFC card reading, the NFC mobile phone identification of safety-security area
Form.The mould group can be used for gate inhibition, smart lock, also can be applied independently as identification apparatus.
Background technique
Security protection application does not go downhill permanently.In the identification of security protection application, NFC identification, fingerprint recognition are most commonly seen.NFC knows
It is not generally divided into the identification of NFC card reading, NFC mobile phone identification, exists in the form of individual module on security device.Fingerprint recognition one
As be also independent fingerprint mould group.
In practical application, above two identification demand often and deposits, is often arranged two kinds of independent functions in equipment
Cell module, cost, area are coordinated controllable etc. to be problems faced.Therefore extending NFC identification function for fingerprint mould group is peace
The convenient act of anti-manufacturer urgently.
Utility model content
The application provides a kind of fingerprint mould group of identification function containing NFC, comprising: NFC microprocessor, fingerprint algorithm chip and
Fingerprint sensor；The fingerprint sensor is connect with the fingerprint algorithm chip, the fingerprint algorithm chip and the micro- place the NFC
Device connection is managed, the NFC microprocessor is communicated by artificial antenna interface with contact type intelligent card, the NFC microprocessor
It is communicated by digital interface with external host computer.
As above, wherein antenna-matching circuit is set between the NFC microprocessor and the artificial antenna interface.
As above, wherein it further include managing the NFC microprocessor, the fingerprint algorithm chip and the fingerprint sensing
Power management chip of the device to the transformation of electric energy, distribution, detection and electric energy management.
As above, wherein the power management chip is connected by power management chip pin VCC with pin GND external
Host computer.
As above, wherein the NFC microprocessor includes that kernel MCU, NFC simulation receive circuit, NFC simulation sends electricity
Road, NFC protocol digital circuit and MCU digital interface；Wherein, the NFC simulation receives circuit, the NFC simulates transmitting line,
The NFC protocol digital circuit passes through number bus with the MCU digital interface and connects the kernel MCU；The NFC simulation
It receives circuit and NFC simulation transmitting line is communicated by artificial antenna interface with the card data of contact type intelligent card, it is described
For NFC protocol digital circuit for handling card data, the kernel MCU passes through digital interface and the fingerprint algorithm core
Piece connection.
As above, wherein it includes low-noise amplifier, frequency mixer, local oscillator, filter that the NFC simulation, which receives circuit,
Wave device and analog-digital converter.
As above, wherein the NFC simulation transmitting line includes digital analog converter, frequency mixer, local oscillator and power
Amplifier.
The application also provides a kind of fingerprint identification method of the fingerprint mould group of identification function containing NFC, comprising: the fingerprint passes
Sensor receives user fingerprints sample data, and sample fingerprint data are sent to the fingerprint algorithm chip；The fingerprint algorithm core
Piece obtains sample fingerprint characteristic point data from sample fingerprint data, and it is micro- that sample fingerprint characteristic point data is sent to the NFC
Processor；The sample fingerprint feature that the NFC microprocessor compares the fingerprint characteristic point data in pre-stored fingerprint library and receives
Point data, if successful match, user identity is legal.
As above, wherein the fingerprint algorithm chip obtains sample fingerprint characteristic point data from sample fingerprint data, right
Particular point in sample fingerprint characteristic point data carries out polar coordinate transform, transformed particular point pair is obtained, by transformed spy
Different point is sent to the NFC microprocessor to by digital interface.
The utility model has the following beneficial effects: using the fingerprint mould group of the identification function provided by the present application containing NFC, so that referring to
Line identification, the identification of NFC card reading and NFC mobile phone identification function integration, by the integration mould group independently using or applied to door
In the security products such as taboo, smart lock, the product form of safety-security area is enriched, cost is reduced, improves a variety of identifications
Coordination controllability.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The some embodiments recorded in application can also be obtained according to these attached drawings other for those of ordinary skill in the art
Attached drawing.
Fig. 1 is the structural schematic diagram of the fingerprint mould group of the identification function provided by the embodiments of the present application containing NFC；
Fig. 2 is the fingerprint module internal structural schematic diagram of the identification function provided by the embodiments of the present application containing NFC；
Fig. 3 is NFC microprocessor architecture schematic diagram；
Fig. 4 is the circuit diagram of NFC microprocessor；
Fig. 5 is the fingerprint identification method flow chart of fingerprint mould group provided by the embodiments of the present application.
Specific embodiment
The technical scheme in the utility model embodiment is clearly and completely described with reference to the accompanying drawing, it is clear that institute
The embodiment of description is the utility model a part of the embodiment, instead of all the embodiments.Based on the reality in the utility model
Apply example, those skilled in the art's every other embodiment obtained without making creative work belongs to this
The range of utility model protection.
Fig. 1 is the structural schematic diagram of the fingerprint mould group of the identification function containing NFC in the embodiment of the present application, and Fig. 2 is to identify containing NFC
The fingerprint module internal structural schematic diagram of function.
Please refer to Fig. 1 and Fig. 2, the fingerprint mould group of the identification function provided by the present application containing NFC, including NFC microprocessor 11,
Fingerprint algorithm chip 12, fingerprint sensor 13 and power management chip 14.
Wherein, the electricity of NFC microprocessor 11, fingerprint algorithm chip 12 and fingerprint sensor 13 with power management chip 14
The electrical connection of source capsule foot, for managing different components to the transformation of electric energy, distribution, detection and electric energy management, and power management chip
14 connect external host computer with pin GND by power management chip pin VCC；Fingerprint sensor 13 and fingerprint algorithm chip 12
Electrical connection, fingerprint sensor 13 are used to receive the finger print information of user, and integrated fingerprint is matched and mentioned in fingerprint algorithm chip 12
Algorithm is taken, the finger print information for transmitting to fingerprint sensor 13 is matched and extracted, NFC microprocessor 11 and fingerprint algorithm
Chip 12 is electrically connected, the finger print information for controlling and dispatching fingerprint algorithm chip 12 and for comparing user, and the micro- place NFC
Reason device 11 is communicatively coupled by digital interface 15 and external host computer, wherein digital interface includes but is not limited to that SPI connects
Mouth, IIC interface, UART interface etc..
Preferably, NFC microprocessor 11 is the MCU of integrated NFC identification function, and processing meets the non-of ISO14443 standard and connects
The data of touch IC card or NFC mobile phone.
In the embodiment of the present application, in order to prevent the impedance of antenna by the floor file of circuit board, shell and setting angle etc. because
Antenna-matching circuit 16 is arranged in the influence of element between NFC microprocessor 11 and artificial antenna interface Ta, Tb, as π type matches electricity
Road, the match circuit 16 are to correct it to the reference impedance when antenna substantial deviation reference impedance (such as 50 ohm).
Referring to Fig. 3, NFC microprocessor 11 includes that kernel MCU110, NFC simulation receive circuit 120, NFC simulation is sent
Circuit 130 and NFC protocol digital circuit 140；Wherein, NFC simulation receives circuit 120, NFC simulation transmitting line 130 and NFC association
It discusses digital circuit 140 and kernel MCU110 is connected by number bus, digital interface 15 connects kernel also by number bus
MCU110；NFC simulation receives circuit 120 and NFC simulation transmitting line 130 passes through artificial antenna interface and contact type intelligent card
Card data communication, NFC protocol digital circuit 140 is for handling contact type intelligent card card data, kernel
MCU110 is connect by digital interface 15 with the fingerprint algorithm chip 12 of fingerprint mould group, for handling and comparing from fingerprint algorithm
The finger print information of chip 12；
As shown in figure 4, NFC simulation, which receives circuit 120, takes electricity and low level signal amplification and shaping for radiofrequency field, specifically include
Low-noise amplifier 1210, frequency mixer 1220, local oscillator 1230, filter 1240 and analog-digital converter (ADC) 1250；
Wherein, low-noise amplifier 1210 is received by antenna from outside contactless formula intelligent card data for amplifying
Signal amplitude, and the interference signal that decays, guarantee the linearity of signal；Frequency mixer 1220 connects low-noise amplifier 1210 and local
Oscillator 1230 receives the data-signal that low-noise amplifier 1210 amplifies, converts to the frequency of data-signal, by data
Signal is mixed with the local oscillator signal that local oscillator 1230 exports, and the frequency and NFC of local oscillated signal receive electricity
The communication frequency on road is identical；Filter 1240 is connect with frequency mixer 1220, is filtered to the data-signal for carrying out self-mixing device 1220
Wave, filter 1240 can be high-pass filter and/or bandpass filter；Analog-digital converter 1250 connect 1240 with filter,
For the analog signal obtained through filter 1240 to be converted to digital signal.
NFC protocol digital circuit 140 connects NFC simulation and receives circuit, and NFC is simulated to the digital signal for receiving circuit and obtaining
It is parsed and is handled.
NFC simulation transmitting line 130 is used to complete the instruction output of contact type intelligent card, specifically includes digital analog converter
(DAC) 1310, frequency mixer 1320, local oscillator 1330 and power amplifier 1340；
Wherein, digital analog converter 1310 is used to the digital signal of instruction to be output being converted to analog signal, frequency mixer
1320 connection digital analog converters 1310 and local oscillator 1330, the frequency for the analog signal being converted to is converted, will
Analog signal is mixed with the local oscillated signal of local oscillator 1330；Power amplifier 1340 and frequency mixer 1320 connect
It connects, the signal power of process is amplified, is then transmitted to contact type intelligent card through artificial antenna interface.
The application also provides the fingerprint identification method of the fingerprint mould group of the identification function containing NFC, as shown in Figure 5, comprising:
Step 501: fingerprint sensor receives user fingerprints sample data, and sample fingerprint data are sent to fingerprint algorithm core
Piece；
In the embodiment of the present application, it is preferable that fingerprint sensor is capacitance type transducers, including arranging as the sense of matrix array
Element is surveyed, for sensing the capacitor between finger and sensor, sensing element has sufficiently small size and is positioned to foot
Enough closely to provide the capacitance imaging of ridge and trench to the skin of finger.
Step 502: fingerprint algorithm chip obtains sample fingerprint characteristic point data from sample fingerprint data, to sample fingerprint
Particular point in characteristic point data carries out polar coordinate transform, obtains transformed particular point pair, by transformed particular point to logical
It crosses digital interface and is sent to NFC microprocessor；
Wherein, particular point is to for two characteristic points adjacent in fingerprint, and the direction of the two is 0 degree or 180 degree, if two spies
Sign point is (ni, nj), and coordinate is respectively (xi, yi, zi), (xj, yj, zj), and xyz distinguishes the rectangular coordinate system of identification characteristics point
Three coefficients, wherein the value range of i and j is 0~characteristic point sum -1, if meeting:
Min (| zi-zj |, 360 °-| zi-zj |) ∈ (0 °, 10 °) or (170 °, 180 °)
Then two characteristic points are particular point pair；
In the present embodiment, particular point is carried out and the left side converts, specifically:
On the basis of the ni of particular point centering point, rectangular co-ordinate is carried out to polar coordinate and is converted to ni, the pole of nj
Coordinate；
The polar coordinates of characteristic point ni
The polar coordinates of characteristic point nj
Wherein, r is characteristic point at a distance from coordinate system center, α be characteristic point and the coordinate system line of centres and reference axis just
To angle, β is characteristic point direction and reference axis forward direction angle.
The fingerprint base prestored inside step 503:NFC microcomputer reads compares the fingerprint feature point in pre-stored fingerprint library
With the particular point pair received, if successful match, user identity is legal, and otherwise user identity is illegal.
Specifically, NFC microprocessor reads the fingerprint prestored from fingerprint base, the characteristic point structure number of legal fingerprint is extracted
According to being pre-processed, default characteristic point data is obtained；Wherein, it is pre-processed and characteristic point structured data is specially stored in memory
In, preset fingerprint characteristic point data is obtained, file fingerprint is converted to the characteristic point data of fingerprint；
Then the fingerprint of non-stop layer point in fingerprint base is rejected, feature point number is less than the fingerprint and center point of preset value
Set the fingerprint for deviateing threshold value；Wherein, the fingerprint central point of each fingerprint is extracted according to professional standard, preset value 32, central point
Position deviation be more than threshold value be specially in the image of 640*640 size, on the basis of thumb [320,400], remaining four refer to
On the basis of [320,320], virtual center point position and base position Euclidean distance are more than 128, to remove poor image quality and spy
The ropy fingerprint of point data is levied, the accuracy of statistic processes is improved.
Centric angle is adjusted to vertical direction by the center that the central point of the fingerprint in fingerprint base is moved to statistical regions,
Characteristic point in preset fingerprint characteristic point data is counted, the weight of each characteristic point is obtained；The central point of fingerprint is moved
To the center of statistical regions, the i.e. position of 400*400, then fingerprint central point direction is adjusted to be in 90 ° with X-axis forward direction
Position the validity in comparing during fingerprint comparison is improved with the benchmark of same fingerprint.
The particular point pair for comparing preset fingerprint characteristic point data and receiving, by the characteristic point in all ratios in conjunction with the ratio
The weight of middle characteristic point obtains final similarity score, exports comparison result according to final similarity score；Specifically, according to
The weight of characteristic point in comparing is cumulative to obtain sum weight, and sum weight is in the quantity than middle characteristic point, obtains fingerprint
Weight coefficient, original similarity score is calculated according to the characteristic point than in, is multiplied on the basis of original similarity score
Final similarity score is obtained with weight coefficient, final similarity score threshold value is set, is exported all greater than similarity score threshold
The fingerprint of value, or be ranked up from high to low according to final similarity score.
Using the fingerprint mould group of the identification function provided by the present application containing NFC, following identification function can be realized:
(1) finger print information can be received by fingerprint sensor, fingerprint algorithm chip, referred in conjunction with the realization of NFC microprocessor
Line identification function；
(2) it can be communicated with contact type intelligent card by artificial antenna interface and complete NFC card reading identification function；
(3) communication with NFC mobile phone is realized by digital interface, realizes NFC mobile phone identification function.
Although the preferred embodiment of the application has been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the application range.Obviously, those skilled in the art can be to the application
Various modification and variations are carried out without departing from spirit and scope.If in this way, these modifications and variations of the application
Belong within the scope of the claim of this application and its equivalent technologies, then the application is also intended to encompass these modification and variations and exists
It is interior.
Claims (7)
1. a kind of fingerprint mould group of identification function containing NFC characterized by comprising NFC microprocessor, fingerprint algorithm chip and
Fingerprint sensor；The fingerprint sensor is connect with the fingerprint algorithm chip, the fingerprint algorithm chip and the micro- place the NFC
Device connection is managed, the NFC microprocessor is communicated by artificial antenna interface with contact type intelligent card, the NFC microprocessor
It is communicated by digital interface with external host computer.
2. the fingerprint mould group of the identification function containing NFC as described in claim 1, which is characterized in that the NFC microprocessor with
Antenna-matching circuit is set between the artificial antenna interface.
3. the fingerprint mould group of the identification function containing NFC as described in claim 1, which is characterized in that further include that manage the NFC micro-
The power supply of processor, the fingerprint algorithm chip and the fingerprint sensor to the transformation of electric energy, distribution, detection and electric energy management
Managing chip.
4. the fingerprint mould group of the identification function containing NFC as claimed in claim 3, which is characterized in that the power management chip is logical
It crosses power management chip pin VCC and connects external host computer with pin GND.
5. the fingerprint mould group of the identification function according to any one of claims 1-4 containing NFC, which is characterized in that the micro- place NFC
Reason device includes that kernel MCU, NFC simulation receive circuit, NFC simulation transmitting line, NFC protocol digital circuit and MCU digital interface；
Wherein, the NFC simulation receives circuit, NFC simulation transmitting line, the NFC protocol digital circuit and the MCU
Digital interface passes through number bus and connects the kernel MCU；The NFC simulation receives circuit and NFC simulation transmitting line is logical
It crosses artificial antenna interface to communicate with the card data of contact type intelligent card, the NFC protocol digital circuit is used for number of cards
According to being handled, the kernel MCU is connect by digital interface with the fingerprint algorithm chip.
6. the fingerprint mould group of the identification function containing NFC as claimed in claim 5, which is characterized in that the NFC simulation receives circuit
Including low-noise amplifier, frequency mixer, local oscillator, filter and analog-digital converter.
7. the fingerprint mould group of the identification function containing NFC as claimed in claim 5, which is characterized in that the NFC simulates transmitting line
Including digital analog converter, frequency mixer, local oscillator and power amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920215054.8U CN209182846U (en) | 2019-02-19 | 2019-02-19 | A kind of fingerprint mould group of the identification function containing NFC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920215054.8U CN209182846U (en) | 2019-02-19 | 2019-02-19 | A kind of fingerprint mould group of the identification function containing NFC |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209182846U true CN209182846U (en) | 2019-07-30 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920215054.8U Active CN209182846U (en) | 2019-02-19 | 2019-02-19 | A kind of fingerprint mould group of the identification function containing NFC |
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| Country | Link |
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| CN (1) | CN209182846U (en) |
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2019
- 2019-02-19 CN CN201920215054.8U patent/CN209182846U/en active Active
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