CN109978099A - A kind of pupilage reflexless terminal based on recognition of face and RFID - Google Patents
A kind of pupilage reflexless terminal based on recognition of face and RFID Download PDFInfo
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- CN109978099A CN109978099A CN201910256879.9A CN201910256879A CN109978099A CN 109978099 A CN109978099 A CN 109978099A CN 201910256879 A CN201910256879 A CN 201910256879A CN 109978099 A CN109978099 A CN 109978099A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
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- G06F18/21—Design or setup of recognition systems or techniques; Extraction of features in feature space; Blind source separation
- G06F18/214—Generating training patterns; Bootstrap methods, e.g. bagging or boosting
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- G06K17/00—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations
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- G06K17/0029—Methods or arrangements for effecting co-operative working between equipments covered by two or more of main groups G06K1/00 - G06K15/00, e.g. automatic card files incorporating conveying and reading operations arrangements or provisious for transferring data to distant stations, e.g. from a sensing device the arrangement being specially adapted for wireless interrogation of grouped or bundled articles tagged with wireless record carriers
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- 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
- G06V40/16—Human faces, e.g. facial parts, sketches or expressions
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Abstract
The present invention relates to the certification reflexless terminal of a kind of combination face recognition technology and radio RF recognition technology, especially a kind of pupilage reflexless terminal based on recognition of face and RFID.The present invention uses modularized design, it mainly include main control module, RFID read-write module, face recognition module, interface module and voice module, the realization of RFID technique is that RFID chip is embedded in the form of bracelet to be worn on each student on hand, it is embedded in RFID read-write module in the terminal, the distinctive label of bracelet core piece is identified by RFID read-write module, the realization of face recognition technology is that face recognition module is embedded into terminal, recognition of face is carried out to student while carrying out RFID identification bracelet, reaches the matched purpose of pupilage.
Description
Technical field
The present invention relates to the certification reflexless terminals of a kind of combination face recognition technology and radio RF recognition technology, especially
A kind of pupilage reflexless terminal based on recognition of face and RFID.
Background technique
Recently as the high speed development of Information and Communication Technology, pupilage identifying system has become the daily religion of school
An indispensable part in activity.RFID is to identify specific objective by radio signals and read and write the one of related data
Kind wireless communication technique, and without establishing mechanical or optical contact between identifying system and specific objective.Utilize RFID technique
Pupilage identifying system be widely used, but single radio-frequency technique will appear the match cognization of identity and much ask
Topic thus cannot achieve the management of student if pupilage is usurped, unidentified personnel replicate identification card.
Recognition of face is a kind of biological identification technology, mainly carries out identification according to the facial feature information of people.Pass through
Image or video flowing containing face, and automatic detection and tracking face in the picture are acquired with video camera or camera, in turn
A series of the relevant technologies of face are carried out to the face detected.If it is daily that face recognition technology is applied to school student
In education activities, the above problem will be improved.
Therefore how the two organically to be combined, applies in the daily education activities of school, becomes and wanted at present
The technical issues of solution.
Summary of the invention
In view of the above-mentioned problems, the present invention proposes a kind of pupilage reflexless terminal combined based on recognition of face and RFID.
The present invention use modularized design, mainly include main control module, RFID read-write module, face recognition module, interface module and
Voice module, the realization of RFID technique is that RFID chip is embedded in the form of bracelet to be worn on each student on hand, at end
It is embedded in RFID read-write module in end, the distinctive label of bracelet core piece is identified by RFID read-write module.Recognition of face
The realization of technology is that face recognition module is embedded into terminal, carries out face knowledge to student while carrying out RFID identification bracelet
Not, reach the matched purpose of pupilage.
The purpose of the present invention is achieved through the following technical solutions: the terminal completes people using modular design method
The hardware realization of face identification and RFID identification, specifically includes main control module, RFID read-write module, face recognition module, connects
Mouth mold block and voice module.
Main control module uses LPC1768 chip, and LPC1768 processor is a low-power consumption, 32 with power
ARM chip, due to the framework and abundant peripheral component of ARM, so that it is suitable for requiring highly integrated, low-power consumption, portable
Pupilage reflexless terminal, pin P0.1, P0.2 of main control module LPC1768, P0.3, P0.4, P0.5, P0.6, P0.7,
P0.01 is connected with pin D2 to the D9 of the OV2640 of face recognition module respectively, carries out the extraction of picture signal；Main control module
Pin P0.8, P0.9, P0.15, P0.16, P0.17, P0.18 of LPC1768 pin with interface module chip NRF2410 respectively
IRQ, CSN, SCK, CE, MISO, MOSI, which are connected, carries out the transmission of data；Pin P2.0, P2.1 of main control module LPC1768,
P2.2, P3.25 are connected with pin P01, P02, P03, RESET of voice module WT588D respectively, realize voice broadcast information；It is main
Pin P2.3 to the P2.12 of control module is connected with pin IO0 to the IO7 of RFID read-write module and pin IRQ and pin EN respectively,
Realize that AS3992 is communicated by parallel port with LPC1768.
RFID read-write module uses AS3992 chip, and AS3992 has the characteristics that integrated level is high, reception is integrated in chip
Circuit, transmitting line, conversion unit of protocol, the 8 parallel-by-bit interfaces or SPI serial line interface for connecting MCU.The pin of LPC1768
P2.3-P2.10 is connected to the parallel communications input and output pin IO0-IO7 of AS3992, realizes main control module and RFID read-write mould
The bidirectional data transfers of block.After card command is swept in the sending of LPC1768 main control chip, AS3992 passes through the linear cathode radio frequency of low-power
Linearly card signal is swept in anode radio frequency output pin RFOPX transmission for output pin RFONX and low-power, first passes around capacitor C1, C2,
Direct current signal is filtered out, inductance L1, L2 are then passed through, is grounded by capacitor C3, C4, so that the signal of specific frequency passes through, the letter
It number is exported by selector T1 pin UB, which is isolated by resistance R2, filters out direct current signal using capacitor C5, so
Enter VC1 pin by resistance R3 and inductance L3 afterwards, is in addition not to be directly entered Vias biasing circuit by inductance L3 all the way
Pin, there are also be to be directly entered RFin pin not by resistance all the way.Vpc2 pin is the energization pins of chip, using 5V
Power supply, first passes through current-limiting resistance R4, just then enter chip interior, in order to guarantee that pure power supply enters chip interior, first
Power supply is filtered by capacitor C6 and capacitor C7, then just enters in chip energization pins VC1.Receive the number that label card is sent
According to signal first passes through antenna, and then then signal passes through inductance after capacitor C10 filtering by data selector port P3
L4 is grounded by capacitor C11, so that the signal of gating frequency passes through, into inside AS3992.
Face recognition module uses OV2640 image processor, and OV2640 is a support video acquisition and compression of images function
The imaging sensor of energy, imaging sensor OV2640 can be realized JPEG compression, can be before not influencing image visual effect
Reduction image data amount is put, directly output jpeg format picture, it is big so as to substantially reduce the required image file transmitted
It is small, it is improved conveniently for the transmission and processing of wireless image.Design uses the I/O mouth analogue I2C bus and camera of LPC1768
It is communicated, realizes configuration of the controller to OV2640, picture number is read by the data output D2-D9 of camera OV2640
According to being wherein connected with the P0_1-P0_8 of LPC1768 mouth for D2-D9 mouthfuls, 3.3V needed for module and GNG are by LPC1768 master control borad
It provides.
Interface module uses wireless communication chips NRF24L01, and NRF24L01 is a kind of single-chip radio transmitting and receiving chip,
2.4GHz working frequency.The running parameters such as transmission power and working frequency can be easy to complete by 4 line SPI ports, pass
Defeated distance fully meets the requirement of short range data transmission.
Voice module uses speech chip WT588D, embeds DSP high speed audio processor, and processing speed is fast；Have more
Kind operating mode, strong interference immunity can be applicable to industrial circle.Voice module is for broadcasting whether pupilage information matches into
Function, the design use three line serial ports PWM output modes, pin P01 and main control module the LPC1768 chip of WT588D speech chip
Pin P2_0 is connected, and realizes the output of 1 channel 1 of pulse-width modulator；Pin P02 and main control module LPC1768 chip pin P2_
1 is connected, and realizes the output of 1 channel 2 of pulse-width modulator；Pin P01 is connected with LPC1768 chip pin P2_2, realizes pulse
The output of 1 channel 3 of width modulator；Pin RESET is connected with LPC1768 chip pin P3_0, so that main control module can control
The reseting procedure of speech recognition module.PWM+ and the PWM- pin of speech chip push loudspeaker, achieve the purpose that broadcast message.
WT588D chip BUSY pin is connected to light emitting diode by protective resistance R1, can show voice broadcast status signal
The BUSY way of output.
Identification terminal workflow are as follows: identification terminal need to carry out RFID information typing, then carry out to student's facial image
Training.Training process calls face database first, carries out detection to image and judges face location in image, size and each major facial
The information such as organ site later extract these identity characteristics, and the information of obtained eigenface and RFID typing is stored in
In server database.When needing to RFID information and face information match cognization, RFID information is obtained first, is carried out later
Image detection, image preprocessing, feature extraction, finally with RFID typing information and eigenface in server database
It compares, if successful match system broadcasts prompt successful match by voice module, otherwise it fails to match for prompt.
The present invention proposes a kind of pupilage reflexless terminal based on recognition of face and RFID, by recognition of face and RFID skill
Art is applied in the bracelet that student wears, to achieve the purpose that pupilage information matches, convenient for the unified management of school, simultaneously
Also avoid the phenomenon easy to be lost of traditional identity identification card.
Detailed description of the invention
Fig. 1 is hardware master-plan block diagram of the invention.
Fig. 2 is main control module schematic diagram of the invention.
Fig. 3 is RFID read-write module schematic diagram of the invention.
Fig. 4 is face recognition module schematic diagram of the invention.
Fig. 5 is interface module schematic diagram of the invention.
Fig. 6 is voice module schematic diagram of the invention.
Fig. 7 is work flow diagram of the invention.
Specific embodiment
The present invention proposes a kind of pupilage reflexless terminal combined based on recognition of face and RFID.The present invention uses module
Change design, mainly includes main control module, RFID read-write module, face recognition module, interface module and voice module, RFID skill
The realization of art is that RFID chip is embedded in the form of bracelet to be worn on each student on hand, is embedded in RFID read-write in the terminal
Module identifies the distinctive label of bracelet core piece by RFID read-write module.The realization of face recognition technology is by people
Face identification module is embedded into terminal, carries out recognition of face to student while carrying out RFID identification bracelet, reaches pupilage
Matched purpose.
As shown in Figure 1 be hardware master-plan block diagram, RFID read-write module, voice module, face detection module respectively with
Main control module is connected, and main control module is connected by interface module with the server database of PC machine.Main control module is known by face
Other module and RFID read-write module obtain the facial image and student bracelet ID of student respectively, carry out Image Acquisition in main control module
And detection, pretreatment, facial image matching and identification, if offline condition occurs, facial image and student's bracelet ID can be kept in
In memory, after network recovery in batches in upload value PC machine server database.Later, when student's brush bracelet, radio frequency
Transceiver module reads the id information of a student, is transferred to server database by interface module, face recognition module is taken the photograph
As the head image information of head acquisition user is transferred to server database, finally judge whether are the face information of student and RFID information
With the information matches of database, if successful match, voice module broadcasts successful match, and otherwise it fails to match for casting.
It is illustrated in figure 2 main control module schematic diagram, the main control module uses LPC1768 chip, LPC1768 processor
A low-power consumption, with power 32 ARM chips, peripheral component include up to 512KB flash memory,
The data storage of 64KB, 4 UART, 2 channels CAN, 2 SPI interfaces, 12 ADC in 8 channels, 10 DAC, motor control
PWM processed, orthogonal encoder interface, 4 general purpose timers, 6 outputs general PWM, have the battery-powered super low-power consumption of independent electrical
RTC and up to 70 general purpose I/O pins.Due to the framework and abundant peripheral component of ARM, so that it is suitable for that height is required to collect
At, low-power consumption, portable pupilage reflexless terminal.Pin P0.1, P0.2 of main control module LPC1768, P0.3, P0.4,
P0.5, P0.6, P0.7, P0.01 are connected with pin D2 to the D9 of the OV2640 of face recognition module respectively, carry out picture signal
It extracts；Pin P0.8, P0.9, P0.15, P0.16, P0.17, P0.18 of main control module LPC1768 respectively with interface module chip
Pin IRQ, CSN, SCK, CE, MISO, MOSI of NRF2410, which is connected, carries out the transmission of data；The pin of main control module LPC1768
P2.0, P2.1, P2.2, P3.25 are connected with pin P01, P02, P03, RESET of voice module WT588D respectively, realize voice
Broadcast information；Pin P2.3 to the P2.12 of main control module respectively with pin IO0 to the IO7 of RFID read-write module and pin IRQ and
Pin EN be connected, realize AS3992 communicated by parallel port with LPC1768, the pin XTAL1 of main control module LPC1768 with draw
Foot XTAL2 is connected with 12MHz crystal oscillator Y1, and is grounded respectively by the capacitor C14 and C15 of 22pF, constitutes crystal oscillating circuit, is master control
Module provides clock.
It is illustrated in figure 3 RFID read-write module schematic diagram, the RFID read-write module uses AS3992 chip, encapsulation
Form is 64 foot QFN encapsulation.AS3992 has the characteristics that integrated level is high, is integrated in chip and receives circuit, transmitting line, agreement
Converting unit, the 8 parallel-by-bit interfaces or SPI serial line interface for connecting MCU.The general digital input/output pin of LPC1768
P2.3-P2.10 is connected to the parallel communications input and output pin IO0-IO7 of AS3992, realizes main control module and RFID read-write mould
The bidirectional data transfers of block, furthermore the port EN is the enabled input pin of AS3992, is responsible for enabled AS3992 chip, the port IRQ
It is the interrupt output pin of AS3992, is responsible for AS3992 chip and generates interruption.LPC1768 main control chip sending sweep card command with
Afterwards, AS3992 passes through the linear cathode radio frequency output pin RFONX of low-power and low-power linearly positive radio frequency output pin RFOPX
Card signal is swept in transmission, is first passed around capacitor C1, C2 of 12pf, is filtered out direct current signal, and inductance L1, L2 of 3.9nH are then passed through, and is led to
Capacitor C3, C4 ground connection of 12pf is crossed, so that the signal of specific frequency passes through, which passes through a selector, so that AS3992
Chip pin RFOPX is connected with selector T1 pin B2, and pin RFONX is connected with selector T1 pin B1, passes through selector T1
Pin UB output signal, the signal are isolated by resistance R2, filter out direct current signal using 100pf capacitor C5, then pass through
The inductance L3 for crossing 6.8K ohm of resistance R3 and 2.2nH enters VC1 pin, is in addition the inductance L3 for not passing through 2.2nH all the way
It is directly entered Vias biasing circuit pin, there are also be to be directly entered RFin pin not by 6.8K Ohmic resistance all the way.Vpc2
Pin is the energization pins of chip, is powered using 5V, and 330 ohm of current-limiting resistance R4 are first passed through, and then just enters chip interior, together
Managing VC1 is also chip energization pins, in order to guarantee that pure power supply enters chip interior, the power supply capacitor C6 that passes through 10uH first
It is filtered with the capacitor C7 of 1000pF, then just enters VC1 pin.4 RFout/VC2 pins are the signal output ends of chip
Mouthful, it due to being power amplifier chips, so the heat generated is very big, needs 4 pins while exporting, expand electric current.Signal output with
Afterwards, to launch above antenna by the capacitor C8 of 100pF using sending and receiving data converter, signal from port P2 into
Enter sending and receiving data converter, by the pin 2 of the capacitor C9 connection antenna of 100pF, antenna leads 1 and pin 3 are grounded pin P1.
The data and signal that reception label card is sent first pass through antenna, and then signal is by data selector port P3, through 100pF
Capacitor C10 filtering after, then pass through the inductance L4 of 3.9nH, be grounded by the capacitor C11 of 100pf, so that the letter of gating frequency
Number pass through, into inside AS3992.
It is illustrated in figure 4 face recognition module schematic diagram, the face recognition module uses OV2640 image processor,
OV2640 is a imaging sensor for supporting video acquisition and compression of images function, and high resolution reaches 1600*1200.Image passes
Sensor OV2640 can be realized JPEG compression, can reduce image data amount under the premise of not influencing image visual effect, directly
Connect output jpeg format picture, so as to the image file size transmitted needed for substantially reducing, be wireless image transmission and
Processing improves conveniently.Design is communicated using the I/O mouth analogue I2C bus of LPC1768 with camera, realizes controller pair
The configuration of OV2640 reads image data by the data output D2-D9 of camera OV2640, wherein D2-D9 mouthful and
The P0_1-P0_8 mouth of LPC1768 is connected, and 3.3V needed for module and GNG are provided by LPC1768 master control borad.
It is illustrated in figure 5 interface module schematic diagram, the interface module uses wireless communication chips NRF24L01,
NRF24L01 is a kind of single-chip radio transmitting and receiving chip, 2.4GHz working frequency.The running parameters such as transmission power and working frequency
It can be easy to complete by 4 line SPI ports, transmission range fully meets the requirement of short range data transmission.Interface module
NRF24L01 communication chip shielding interrupt pin IRQ is connected with master control LPC1768 chip pin P0_8, SPI chip selection signal pin
CSN is connected with main control chip pin P0_9, can achieve the purpose of the operation of control spi bus.The chip pin of interface module
SCK is connect with main control module chip pin P0_15, provides the serial clock of SPI；The chip pin CE and master control mould of interface module
Block chip pin P0_16 connection, so that the slave to SPI selects；The chip pin MISO and main control module chip of interface module
Host input, the slave output of SPI are realized in pin P0_17 connection；The chip pin MOSI and main control module chip of interface module
Pin P0_18 is connected, and realizes host output, the slave input of SPI；NRF24L01 chip pin VDD is separately connected with pin GND
5V voltage and ground connection.
It is illustrated in figure 6 voice module schematic diagram, the voice module uses speech chip WT588D, embeds
DSP high speed audio processor, processing speed are fast；Built-in 13Bit/D/A converter and 12Bit/PWM output, sound quality are good；Branch
Hold two kinds of way of outputs of DAC/PWM；There are many operating mode, strong interference immunity can be applicable to industrial circle.Voice module is used for
Broadcast pupilage information whether successful match, the design uses three line serial ports PWM output modes, and WT588D speech chip draws
Foot P01 is connected with main control module LPC1768 chip pin P2_0, realizes the output of 1 channel 1 of pulse-width modulator；Pin P02 with
Main control module LPC1768 chip pin P2_1 is connected, and realizes the output of 1 channel 2 of pulse-width modulator；Pin P01 and LPC1768
Chip pin P2_2 is connected, and realizes the output of 1 channel 3 of pulse-width modulator；Pin RESET and LPC1768 chip pin P3_0
It is connected, so that main control module can control the reseting procedure of speech recognition module.PWM+ and the PWM- pin of speech chip push
Loudspeaker achievees the purpose that broadcast message.WT588D chip BUSY pin is connected to light emitting diode by protective resistance R1, can
To show the BUSY way of output of voice broadcast status signal.VDD pin and GND pin connect 5V voltage and ground respectively.
It is illustrated in figure 7 work flow diagram, identification terminal of the present invention need to carry out RFID information typing, then to student
Facial image is trained.Training process calls face database first, carries out detection to image and judges face location in image, size
With the information such as each major facial organ site, these identity characteristics are extracted later, obtained eigenface and RFID typing
Information be stored in server database.When needing to RFID information and face information match cognization, acquisition RFID first
Information carries out image detection, image preprocessing, feature extraction later, finally records with the RFID in server database
Enter information to compare with eigenface, if successful match system broadcasts prompt successful match by voice module, otherwise prompt
With failure.
The invention proposes the identities match terminals of a kind of combination RFID radio-frequency technique and face recognition technology, for school
To student-directed scheme, devises and a carry out the matched bracelet of identification.RFID and face recognition technology combination technology
Refer to that, by two layers of identification threshold, first of identification threshold needs the terminal to activate RF receiving/transmission device first, pass through RFID skill
Art authenticating identity, then recalls the information of face typing, and second identification threshold needs to realize by face recognition technology, pass through
Identities match is realized in face feature comparison with identification people, in the case where two verifyings all pass through, terminal notifying identity letter
Successful match is ceased, identities match failure is otherwise prompted.
Claims (7)
1. a kind of pupilage reflexless terminal based on recognition of face and RFID, it is characterised in that: terminal uses modularized design,
It mainly include main control module, RFID read-write module, face recognition module, interface module and voice module, the reality of RFID technique
It is now that RFID chip is embedded in the form of bracelet to be worn on each student on hand, is embedded in RFID read-write module in the terminal,
The distinctive label of bracelet core piece is identified by RFID read-write module.The realization of face recognition technology is by recognition of face
Module-embedding carries out recognition of face to student while carrying out RFID identification bracelet, it is matched to reach pupilage to terminal
Purpose.
2. a kind of pupilage reflexless terminal based on recognition of face and RFID according to claim 1, it is characterised in that:
The main control module uses LPC1768 chip, and LPC1768 processor is a low-power consumption, 32 ARM with power
Chip, due to the framework and abundant peripheral component of ARM, so that it is suitable for requiring highly integrated, low-power consumption, portable student
Identities match terminal, pin P0.1, P0.2, P0.3, P0.4, P0.5, P0.6, P0.7, P0.01 points of main control module LPC1768
It is not connected with pin D2 to the D9 of the OV2640 of face recognition module, carries out the extraction of picture signal；Main control module LPC1768's
Pin P0.8, P0.9, P0.15, P0.16, P0.17, P0.18 respectively with pin IRQ, CSN of interface module chip NRF2410,
SCK, CE, MISO, MOSI, which are connected, carries out the transmission of data；Pin P2.0, P2.1, P2.2, P3.25 of main control module LPC1768
It is connected respectively with pin P01, P02, P03, RESET of voice module WT588D, realizes voice broadcast information；Main control module draws
Foot P2.3 to P2.12 is connected with pin IO0 to the IO7 of RFID read-write module and pin IRQ and pin EN respectively, realizes AS3992
It is communicated by parallel port with LPC1768.
3. a kind of pupilage reflexless terminal based on recognition of face and RFID according to claim 1, it is characterised in that:
The RFID read-write module uses AS3992 chip, and AS3992 has the characteristics that integrated level is high, and reception electricity is integrated in chip
Road, transmitting line, conversion unit of protocol, the 8 parallel-by-bit interfaces or SPI serial line interface for connecting MCU.The pin P2.3- of LPC1768
P2.10 is connected to the parallel communications input and output pin IO0-IO7 of AS3992, realizes pair of main control module and RFID read-write module
It is transmitted to data.After card command is swept in the sending of LPC1768 main control chip, AS3992 is drawn by the linear cathode radio frequency output of low-power
Linearly card signal is swept in anode radio frequency output pin RFOPX transmission for foot RFONX and low-power, is first passed around capacitor C1, C2, is filtered out straight
Signal is flowed, inductance L1, L2 are then passed through, is grounded by capacitor C3, C4, so that the signal of specific frequency passes through, which passes through
Selector T1 pin UB output, the signal are isolated by resistance R2, filter out direct current signal using capacitor C5, then pass through
Resistance R3 and inductance L3 enter VC1 pin, are in addition not to be directly entered Vias biasing circuit pin by inductance L3 all the way, also
It is to be directly entered RFin pin not by resistance all the way.Vpc2 pin is the energization pins of chip, is powered using 5V, first
By current-limiting resistance R4, just then entering chip interior, in order to guarantee that pure power supply enters chip interior, power supply first passes through
Capacitor C6 and capacitor C7 filtering processing, then just enters in chip energization pins VC1.Receive the data that label card is sent, signal
Antenna is first passed through, then then signal is passed through inductance L4, pass through electricity by data selector port P3 after capacitor C10 filtering
Hold C11 ground connection, so that the signal of gating frequency passes through, into inside AS3992.
4. a kind of pupilage reflexless terminal based on recognition of face and RFID according to claim 1, it is characterised in that:
The face recognition module uses OV2640 image processor, and OV2640 is a support video acquisition and compression of images function
Imaging sensor, imaging sensor OV2640 can be realized JPEG compression, can be in the premise for not influencing image visual effect
Lower reduction image data amount, directly output jpeg format picture, so as to substantially reduce the required image file size transmitted,
It is improved conveniently for the transmission and processing of wireless image.Design using LPC1768 I/O mouth analogue I2C bus and camera into
Configuration of the controller to OV2640 is realized in row communication, reads picture number by the data output D2-D9 of camera OV2640
According to being wherein connected with the P0_1-P0_8 of LPC1768 mouth for D2-D9 mouthfuls, 3.3V needed for module and GNG are by LPC1768 master control borad
It provides.
5. a kind of pupilage reflexless terminal based on recognition of face and RFID according to claim 1, it is characterised in that:
The interface module uses wireless communication chips NRF24L01, and NRF24L01 is a kind of single-chip radio transmitting and receiving chip,
2.4GHz working frequency.The running parameters such as transmission power and working frequency can be easy to complete by 4 line SPI ports, pass
Defeated distance fully meets the requirement of short range data transmission.
6. a kind of pupilage reflexless terminal based on recognition of face and RFID according to claim 1, it is characterised in that:
The voice module uses speech chip WT588D, embeds DSP high speed audio processor, and processing speed is fast；There are many
Operating mode, strong interference immunity can be applicable to industrial circle.Voice module is for broadcasting whether pupilage information matches into
Function, the design use three line serial ports PWM output modes, pin P01 and main control module the LPC1768 chip of WT588D speech chip
Pin P2_0 is connected, and realizes the output of 1 channel 1 of pulse-width modulator；Pin P02 and main control module LPC1768 chip pin P2_
1 is connected, and realizes the output of 1 channel 2 of pulse-width modulator；Pin P01 is connected with LPC1768 chip pin P2_2, realizes pulse
The output of 1 channel 3 of width modulator；Pin RESET is connected with LPC1768 chip pin P3_0, so that main control module can control
The reseting procedure of speech recognition module.PWM+ and the PWM- pin of speech chip push loudspeaker, achieve the purpose that broadcast message.
WT588D chip BUSY pin is connected to light emitting diode by protective resistance R1, can show voice broadcast status signal
The BUSY way of output.
7. a kind of pupilage reflexless terminal based on recognition of face and RFID according to claim 1, it is characterised in that:
The identification terminal workflow are as follows: identification terminal need to carry out RFID information typing, then instruct to student's facial image
Practice.Training process calls face database first, carries out detection to image and judges face location in image, size and each major facial device
The information such as official position later extract these identity characteristics, and the information of obtained eigenface and RFID typing is stored in clothes
It is engaged in device database.When needing to RFID information and face information match cognization, RFID information is obtained first, carries out figure later
As detection, image preprocessing, feature extraction, finally in server database RFID typing information and eigenface into
Row comparison, if successful match system broadcasts prompt successful match by voice module, otherwise it fails to match for prompt.
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| CN113069751A (en) * | 2021-04-01 | 2021-07-06 | 长春工业大学 | Student identity recognition matching terminal for physique detection |
| CN115471942A (en) * | 2022-11-15 | 2022-12-13 | 内江市感官密码科技有限公司 | Campus access control system and monitoring method thereof |
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