CN210223041U

CN210223041U - Processing circuit related to license plate recognition

Info

Publication number: CN210223041U
Application number: CN201920987298.8U
Authority: CN
Inventors: Zhenyu Tong; 童振宇; Hua Jiang; 姜华
Original assignee: Universal Intelligent Parking (shenzhen) Co Ltd
Current assignee: Universal Intelligent Parking (shenzhen) Co Ltd
Priority date: 2019-06-28
Filing date: 2019-06-28
Publication date: 2020-03-31
Anticipated expiration: 2029-06-28

Abstract

The utility model discloses a processing circuit related to license plate recognition, which comprises a power circuit, a conversion chip and a processing chip, wherein the power circuit is electrically connected with the conversion chip and the processing chip and provides electric quantity support for the conversion chip and the processing chip during data processing; conversion chip one end links to each other with the processing chip electrical property, and the other end passes through the UART interface and links to each other with the start sensor electricity, the processing chip links to each other with the processing sensor electrical property, receives the signal of telecommunication of mainboard after, control the processing sensor carries out work, accurately discerns and transmits to backstage server the license plate. Different circuits are arranged, various problems possibly occurring in the vehicle identification process are processed in a special mode, the use requirements under various conditions are met, and therefore vehicle information can be transmitted to the background server to be effectively processed.

Description

Processing circuit related to license plate recognition

Technical Field

The utility model relates to a circuit field especially relates to a processing circuit of relevant license plate discernment.

Background

In recent years, with the acceleration of urbanization, the consumption level of residents is improved, and the popularity of the number of urban automobiles is greatly increased. The number of the matched parking lots is slowly increased. The roadside parking field is used as a necessary supplement of a parking mode and is continuously enlarged in scale in order to practically solve parking pressure, but phenomena of roadside parking stall disorder, operation disorder, charge disorder, order disorder, supervision disorder and the like are prominent to a certain extent due to the fact that the difference between the quantity of motor vehicles kept and the supply of parking stalls is increased year by year, and the traditional manual management traffic cannot adapt to the change, so that the intelligent traffic system is widely applied to urban traffic management and dispatching China. The license plate recognition is the core of the intelligent traffic system.

However, in the vehicle identification and transmission process, the vehicle identification and transmission process is influenced by a plurality of different factors, for example, in the prior art, when WiFi is used for data transmission, devices such as external routers are needed, and the transmission efficiency is influenced; in the process of photographing, the distance is too far to be focused accurately due to the influence of external light and the distance, so that the picture is blurred; the light is too dark to be clearly photographed, thereby causing great difficulty in vehicle recognition.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the technology, the application provides a processing circuit related to license plate recognition, firstly, a transmission unit adopts a 4G technology to transmit data, the instability of a wifi transmission technology is eliminated, then a distance detection unit and a photosensitive sensor are arranged, and detection and judgment are respectively carried out from two aspects of distance and illumination intensity, so that the license plate is better acquired and recognized.

In order to achieve the above object, the present invention provides a processing circuit for license plate recognition, which comprises a power circuit, a conversion chip and a processing chip, wherein the power circuit is electrically connected to the conversion chip and the processing chip, and provides electric quantity support for the conversion chip and the processing chip during data processing; conversion chip one end links to each other with the processing chip electrical property, and the other end passes through the UART interface and links to each other with the start sensor electricity, the processing chip links to each other with the processing sensor electrical property, receives the signal of telecommunication of mainboard after, control the processing sensor carries out work, accurately discerns and transmits to backstage server the license plate.

Preferably, the power circuit comprises a conversion circuit, a boost circuit and a buck circuit, the conversion circuit is provided with a plurality of pins, the plurality of pins comprise a first pin, a second pin and a third pin, and the first pin and the third pin are electrically connected with the conversion chip; one end of the voltage boosting circuit is electrically connected with the second pin, the other end of the voltage boosting circuit is connected with the voltage reducing circuit, the voltage reducing circuit comprises a first-stage voltage reducing circuit and a second-stage voltage reducing circuit, one end of the first-stage voltage reducing circuit is connected with the voltage boosting circuit, and the other end of the first-stage voltage reducing circuit is connected with the second-stage voltage reducing circuit.

Preferably, the conversion chip is provided with a plurality of pins, including a start pin and a transmission pin, the start pin is an LPUART1, and is electrically connected to the start sensor, and after receiving the data information of the start sensor, the data information is processed by the conversion chip, and then the start signal and the data information are transmitted to the processing chip through the transmission pin.

Preferably, the starting sensor is an infrared starting sensor and is driven by adopting a pulse modulation mode, a plurality of voltage stabilizing diodes are arranged on the starting sensor, one end of each voltage stabilizing diode is connected with the pulse adjusting circuit, and the other end of each voltage stabilizing diode is grounded.

Preferably, the control circuit of the processing sensor is provided with a plurality of pins, the plurality of pins are all electrically connected with the processing chip, and the chip used by the processing sensor is an FPC30_0D 5.

Preferably, the processing chip is provided with a plurality of data interfaces, including a processing sensor interface, a transmission interface and a 4G communication interface, the transmission interface includes a first interface connected with the conversion chip and a second interface for waking up the 4G module, the processing sensor interface is provided with a plurality of pins, all coupled with the pins of the processing sensor, and the 4G communication interface is a USB transmission interface for transmitting the photo information to the 4G module.

Preferably, the 4G module comprises a 4G power supply control circuit and a 4G transmission circuit, the 4G power supply control circuit is connected with the conversion chip through a pin MC _ PWR _4G, an emitter is grounded after passing through an NPN triode, a collector is connected with a gate of a PMOS transistor, a drain of the PMOS transistor is connected to a pin VIN _2G, and the pin passes through the transmission circuit to finally obtain a VSYS _2G pin connected with the 4G transmission circuit; meanwhile, after the photo information is introduced into the 4G transmission circuit through the pin USB _ DM and the pin USB _ DP, the photo information is sent into the background server by using the transmission chip.

Preferably, the processing chip is HI3516EV100, and the conversion chip adopting conversion is STM65L053R8T6_ LQFP 64.

The utility model has the advantages that: compared with the prior art, the utility model discloses set up the distance detecting element, carry out real-time handle control to the distance between vehicle and the recognition device, only when the distance between the two reaches the settlement threshold value, just can send start information and give other units work, can effectively avoid the waste of resource like this, alleviateed the work load of other units simultaneously, the life of whole device is more permanent; in addition, in the process of photographing and identifying the vehicle, the lighting unit is specially arranged, light supplement processing is performed in the photographing process by the aid of the lighting unit, accordingly, the vehicle can be identified more conveniently and accurately, data information is transmitted to the background server by the aid of the 4G transmission technology, the background server records the time of the vehicle entering and leaving the garage, and subsequent processing is performed on the vehicle conveniently.

Drawings

FIG. 1 is a schematic circuit diagram of the present invention;

FIGS. 2-4 are diagrams of processing chips according to the present application;

FIG. 5 is a circuit diagram of the process sensor of the present application;

FIG. 6 is a circuit diagram of a conversion chip of the present application;

fig. 7-19 are detailed circuit diagrams of the present application.

FIGS. 20-24 are enlarged circuit diagrams of various portions of FIG. 2;

FIGS. 25-29 are respective partial enlarged circuit diagrams of FIG. 3;

fig. 30-31 are enlarged circuit diagrams of the conversion chip.

Detailed Description

In order to make the present invention clearer, the present invention will be further described with reference to the accompanying drawings.

Referring to fig. 1, a processing circuit related to license plate recognition is characterized by comprising a power circuit, a conversion chip and a processing chip, wherein the power circuit is electrically connected with the conversion chip and the processing chip and provides electric quantity support for the conversion chip and the processing chip during data processing; conversion chip one end links to each other with the processing chip electrical property, and the other end passes through the UART interface and links to each other with the start sensor electricity, and the processing chip links to each other with the processing sensor electrical property, receives the signal of telecommunication of mainboard after, control processing sensor carries out work, accurately discerns the license plate and transmits to backstage server.

Referring to fig. 2 to 19, in order to achieve the above object, the power circuit includes a converting circuit, a voltage boosting circuit and a voltage dropping circuit, the converting circuit has a plurality of pins including a first pin VBAT, a second pin 3.7VIN and a third pin MCU _ VCC33, and the first pin and the third pin are electrically connected to the converting chip; one end of the voltage boosting circuit is electrically connected with the second pin, the other end of the voltage boosting circuit is connected with the voltage reducing circuit, the voltage reducing circuit comprises a primary voltage reducing circuit and a secondary voltage reducing circuit, one end of the primary voltage reducing circuit is connected with the voltage boosting circuit, and the other end of the primary voltage reducing circuit is connected with the secondary voltage reducing circuit; more specifically, after passing through a PH2_2D54_ L _ DIP chip, an external power supply has a signal output pin VBTA, the signal output pin is connected with a conversion circuit and is connected with a drain electrode of a PMOS (P-channel metal oxide semiconductor) tube after passing through a diode D4, a source electrode of the PMOS tube is connected with the output pin, a resistor and a capacitor are arranged between the source electrode of the PMOS tube and a connecting line of the output pin in parallel, the other ends of the resistor and the capacitor are grounded, a grid electrode of the PMOS tube is also connected with a collector electrode of a triode, an emitter electrode of the triode is grounded, and a base electrode is coupled with a PWR _ HOLD pin of the conversion chip; the third pin is connected with the collector of the triode after passing through the J21 chip; the 3.7VIN pin is connected by adopting two circuit chips FP6715, the first one is connected with the chip FP6715 through an inductor L10, the second one is connected with the chip FP6715, capacitors C299 and C298 are further arranged on the second conductor in parallel, the other ends of the two capacitors are grounded, an electric signal processed by the chip FP6715 is transmitted to a pin 5V0_ DC, the electric signal is connected to a chip MP1494S after passing through two capacitors C127 and C106 which are connected in parallel, the electric signal is finally connected to an interface 3V3 through two resistors which are connected in parallel, and the voltage value is finally stabilized at 3.3V.

The conversion chip is provided with a plurality of pins, including a start pin and a transmission pin, the start pin is LPUART1, is electrically connected with the start sensor, receives the data information of the start sensor, processes the data information through the conversion chip, and transmits start signals, data information and the like to the processing chip through the transmission pin. The starting sensor is an infrared starting sensor and is driven by adopting a modulation pulse mode, a plurality of voltage stabilizing diodes are arranged on the starting sensor, one end of each voltage stabilizing diode is connected with an adjusting pulse circuit, the other end of each voltage stabilizing diode is grounded, a VDD _ WAVE _5V pin is obtained after J5 processing, two output pins WAVE _ RX and WAVE _ TX are obtained after the pins pass through a circuit of the ultrasonic module, the two output pins are both coupled with a conversion chip and receive instruction information of the conversion chip, data information of the starting sensor is received through an LPUART1 interface, the data information is connected with a 4G module through a pin MCU _ PWR _4G after processing, the 4G module is started to work, and meanwhile, pins UART2_ TXD and UART2_ RXD are used for connecting with the processing chip and the processing chip is started to work.

The control circuit of the processing sensor is provided with a plurality of pins which are all electrically connected with the processing chip, and the chip used by the processing sensor is FPC30_0D 5. Specifically, the camera module is used as an embodiment, the MIPI pin on the camera module is coupled with the processing chip, the control of the processing chip is received, the camera module is started to work, the camera module transmits the acquired photo information back to the processing chip, and the processing chip transmits the photo information to the 4G module through the pin USB _ DM and the pin USB _ DP.

A plurality of circuits are arranged in the 4G module and comprise a 4G power supply control circuit and a 4G transmission circuit, the 4G power supply control circuit is connected with the conversion chip through a pin MC _ PWR _4G, an emitting electrode is grounded after the conversion chip passes through an NPN triode, a collector electrode is connected with a grid electrode of a PMOS (P-channel metal oxide semiconductor) tube, a drain electrode of the PMOS tube is connected to a pin VIN _2G, and the pin passes through the transmission circuit to finally obtain a VSYS _2G pin connected with the 4G transmission circuit; meanwhile, after the photo information is introduced through the pin USB _ DM and the pin USB _ DP, the photo information is sent to the background server by using a transmission chip, and the type of the transmission chip is PH8x2_2D0_ SMT.

In specific implementation, the processing chip is HI3516EV100, the conversion chip adopting conversion is STM65L053R8T6_ LQFP64, the conversion chip is further provided with a pin connected with a photosensitive resistor, the photosensitive resistor and an LED lamp are externally connected, and when external light is weak, the LED lamp emits light, so that the camera module is assisted to work.

The utility model discloses a work flow is: the laser probe adopts a low-power infrared laser as a transmitting light source and is driven by adopting a modulation pulse mode, the laser only performs transmitting action in a very short time and returns to a receiving end after being reflected by an obstacle, and related distance measurement data are accurately obtained through a data algorithm. The CYCLOPS sensor adopts a serial port UART with 3.3V level for communication, is connected with the conversion chip, and acquires measurement data in real time according to a communication protocol defined by a system. The data output of the sensor adopts a serial port, the Baud rate is 115-200bps, and the data consists of a frame header, the length of the rest data, a data area and a CRC check code. The laser probe detects the distance in real time, when a vehicle enters a detection range, the laser receiving end outputs the received signal to the LPUART1 port of the conversion chip in the form of the distance, and the conversion chip turns on the power supply of the processing chip and the 4G module.

The processing chip starts the camera to photograph the license plate of the vehicle, whether light is supplemented or not is judged according to the detected light intensity, and the photographed picture is transmitted to the 4G module through the USB interface; the 4G board starts searching for networks, which by default are 4G by priority, then 3G, 2G. And after the 4G signal is searched, dialing networking is carried out to obtain an IP. When the network environment is poor and the 4G state cannot be searched, the module can search 2G and 3G signals and dial up the network in the 2G and 3G states. The photo data is then transmitted to the network via the antenna. After the transmission is successful, the conversion chip turns off the power supplies of the processing chip and the 4G module.

Otherwise, when the vehicle is driven away from the parking space, the laser outputs the received signal in a distance mode, the conversion chip is fed back, then the power supplies of the control chip and the 4G module are turned on, the control chip transmits the picture shot by the camera to the 4G module through the USB, the 4G board transmits the picture to the 4G network, and after the transmission is successful, the conversion chip turns off the power supplies of the control chip and the 4G module

The utility model has the advantages that:

1) aiming at different processing circuits, all pins are directly coupled with each other, so that a plurality of sensors can work in a mutually matched mode, real-time processing can be carried out under different conditions, and accurate recognition of vehicles is guaranteed;

2) by utilizing the 4G communication technology, real-time communication can be ensured under any condition, and the connection stability is ensured.

The above disclosure is only for the specific embodiments of the present invention, but the present invention is not limited thereto, and any changes that can be made by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A processing circuit related to license plate recognition is characterized by comprising a power circuit, a conversion chip and a processing chip, wherein the power circuit is electrically connected with the conversion chip and the processing chip and provides electric quantity support for the conversion chip and the processing chip during data processing; conversion chip one end links to each other with the processing chip electrical property, and the other end passes through the UART interface and links to each other with the start sensor electricity, the processing chip links to each other with the processing sensor electrical property, receives the signal of telecommunication of mainboard after, control the processing sensor carries out work, accurately discerns and transmits to backstage server the license plate.

2. The processing circuit of claim 1, wherein the power circuit comprises a conversion circuit, a boost circuit and a buck circuit, the conversion circuit is provided with a plurality of pins including a first pin, a second pin and a third pin, and the first pin and the third pin are electrically connected with the conversion chip; one end of the voltage boosting circuit is electrically connected with the second pin, the other end of the voltage boosting circuit is connected with the voltage reducing circuit, the voltage reducing circuit comprises a first-stage voltage reducing circuit and a second-stage voltage reducing circuit, one end of the first-stage voltage reducing circuit is connected with the voltage boosting circuit, and the other end of the first-stage voltage reducing circuit is connected with the second-stage voltage reducing circuit.

3. The processing circuit of claim 1, wherein the converting chip is provided with a plurality of pins, including a start pin and a transmission pin, the start pin is an lpart 1 and is electrically connected to the start sensor, and after receiving the data information of the start sensor, the converting chip processes the data information and transmits a start signal and the data information to the processing chip through the transmission pin.

4. The processing circuit according to claim 1, wherein the start sensor is an infrared start sensor and is driven by a modulated pulse method, and a plurality of voltage stabilizing diodes are arranged on the start sensor, one end of each voltage stabilizing diode is connected with the adjusting pulse circuit, and the other end of each voltage stabilizing diode is grounded.

5. The processing circuit of claim 1, wherein the control circuit of the processing sensor is provided with a plurality of pins, the plurality of pins are electrically connected to the processing chip, and the chip used by the processing sensor is FPC30_0D 5.

6. The processing circuit according to claim 1, wherein the processing chip is provided with a plurality of data interfaces, including a processing sensor interface, a transmission interface and a 4G communication interface, the transmission interface includes a first interface connected to the conversion chip and a second interface for waking up the 4G module, the processing sensor interface is provided with a plurality of pins, all coupled to the pins of the processing sensor, and the 4G communication interface is a USB transmission interface for transmitting the photo information into the 4G module.

7. The processing circuit of claim 6, wherein the 4G module comprises a 4G power control circuit and a 4G transmission circuit, the 4G power control circuit is connected with the conversion chip through a pin MC _ PWR _4G, after passing through an NPN triode, an emitter is grounded, a collector is connected with a grid electrode of a PMOS (P-channel metal oxide semiconductor) tube, a drain electrode of the PMOS tube is connected to a pin VIN _2G, and the pin passes through the transmission circuit to finally obtain a VSYS _2G pin connected with the 4G transmission circuit; meanwhile, after the photo information is introduced into the 4G transmission circuit through the pin USB _ DM and the pin USB _ DP, the photo information is sent into the background server by using the transmission chip.

8. The processing circuit of claim 1, wherein the processing chip is a HI3516EV100, and the conversion chip using conversion is STM65L053R8T6_ LQFP 64.