CN113542392B - Cold chain vehicle operation environment monitoring method based on wireless communication - Google Patents

Cold chain vehicle operation environment monitoring method based on wireless communication Download PDF

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CN113542392B
CN113542392B CN202110784538.6A CN202110784538A CN113542392B CN 113542392 B CN113542392 B CN 113542392B CN 202110784538 A CN202110784538 A CN 202110784538A CN 113542392 B CN113542392 B CN 113542392B
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carriage
cold chain
video
pixel value
wireless communication
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CN113542392A (en
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张红伟
陶尚进
韩洋
徐赛
方毅
陈静
许先璠
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Anhui University
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Anhui University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/10—Segmentation; Edge detection
    • G06T7/11—Region-based segmentation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/10—Segmentation; Edge detection
    • G06T7/136—Segmentation; Edge detection involving thresholding
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • G06T7/60—Analysis of geometric attributes
    • G06T7/62—Analysis of geometric attributes of area, perimeter, diameter or volume
    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
    • G08B21/18—Status alarms
    • G08B21/24—Reminder alarms, e.g. anti-loss alarms
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/50—Network services
    • H04L67/52—Network services specially adapted for the location of the user terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
    • H04N7/181—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a plurality of remote sources
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H04W4/029—Location-based management or tracking services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/30—Services specially adapted for particular environments, situations or purposes
    • H04W4/38—Services specially adapted for particular environments, situations or purposes for collecting sensor information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/80—Services using short range communication, e.g. near-field communication [NFC], radio-frequency identification [RFID] or low energy communication
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/10—Image acquisition modality
    • G06T2207/10016—Video; Image sequence
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T2207/00—Indexing scheme for image analysis or image enhancement
    • G06T2207/30—Subject of image; Context of image processing
    • G06T2207/30204—Marker

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  • Computer Networks & Wireless Communication (AREA)
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Abstract

The invention relates to the field of cold chain vehicles, in particular to a cold chain vehicle operation environment monitoring method based on wireless communication. The monitoring method comprises the following steps: collecting empty carriage pictures and video pictures when cargoes are not loaded in the carriage; thresholding is carried out on the video picture to obtain a new pixel value; the thresholding method comprises the following steps: reading the empty picture to obtain a corresponding original pixel value; defining intermediate values of the original pixel values as corresponding threshold values; reading the video picture to obtain a corresponding video pixel value; if the video pixel value is not equal to the threshold value, a new pixel value is given to the video picture of the corresponding part; drawing lines on the video picture of the part endowed with the new pixel value, and marking the corresponding outline; the area of the contour is calculated. The invention marks the outline of the change of the pixel points of the picture shot by the camera, thereby displaying the area loaded with goods and the area not loaded with goods on the application end.

Description

Cold chain vehicle operation environment monitoring method based on wireless communication
Technical Field
The invention relates to the field of cold chain vehicles, in particular to a cold chain vehicle operation environment monitoring method based on wireless communication.
Background
With the development of information technology, transparency management is required in the transportation process of cold chain vehicles. In the transportation process of the cold chain vehicle, accurate data in the carriage of the cold chain vehicle are needed to be obtained in real time, and the transportation condition of the vehicle and the running environment of the vehicle are concerned, so that the condition in the transportation process is prevented, and the influence on the safety and stability of the quality of the article transportation is formed. It is therefore necessary to make the driver grasp the data of the vehicle itself in real time by means of a wireless information transmission system.
Disclosure of Invention
The invention provides a cold chain vehicle operation environment monitoring method based on wireless communication, which aims to solve the technical problem that the size of the residual space in a carriage is mastered in real time when goods are loaded and unloaded into the carriage of a cold chain vehicle.
The invention is realized by adopting the following technical scheme: a method for monitoring the running environment of a cold chain vehicle based on wireless communication, which is used for calculating the size of the remaining area of the interior of a carriage after goods are loaded and unloaded, the monitoring method comprises the following steps:
Step S1, collecting an empty carriage picture when cargoes are not loaded in a carriage, and dividing the empty carriage picture into a plurality of parts; collecting video pictures in a carriage in real time, and dividing the video pictures of each frame into a plurality of parts; the video pictures divided into a plurality of parts are in one-to-one correspondence with the empty box pictures of the plurality of parts;
Step S2, thresholding is carried out on the video picture of each part to obtain new pixel values of each part; the thresholding method comprises the following steps:
step S21, reading the empty carriage picture of each part to obtain a corresponding original pixel value; defining the intermediate value of each original pixel value as a corresponding threshold value;
step S22, reading each part of the video picture to obtain a corresponding video pixel value;
Step S23, determining the threshold value of each portion and the magnitude of the video pixel value: ending if the video pixel value is equal to the threshold value; if the video pixel value is not equal to the threshold value, a new pixel value is given to the video picture of the corresponding part;
Step S3, drawing lines on the video picture of the part endowed with the new pixel value, marking the corresponding outline, and distinguishing the outline from the area without goods;
and S4, outputting the video picture with the outline mark, and calculating the size of the spare area of the carriage.
As a further improvement of the above-described aspect, in step S4, the method of calculating the free area of the vehicle cabin includes the steps of:
step S41, calculating the actual carriage area through the empty carriage picture;
step S42, calculating the area of the carriage occupied by the goods through the video picture after the contour mark;
Step S43, obtaining the spare area of the carriage by the difference between the actual carriage area and the carriage area occupied by the cargoes.
The invention also discloses a cold chain vehicle running environment monitoring system based on wireless communication, which comprises:
A temperature and humidity sensor for detecting the temperature and humidity in the vehicle cabin;
The acceleration sensor is used for collecting the running condition of the cold chain vehicle;
a plurality of tire temperature and pressure sensors for detecting tire temperatures and pressures of a plurality of tires, respectively;
The inner camera is used for collecting images inside the carriage;
a hall switch for detecting a state of a cabin door;
A vehicle oil level sensor for detecting an amount of oil of a vehicle;
a refrigerant oil level sensor for detecting an amount of oil of the refrigerant;
a GPS for detecting a position of the cold chain vehicle; and
The main control assembly calculates the size of the residual area after goods are loaded and unloaded in the carriage according to a cold chain vehicle running environment monitoring method based on wireless communication, and receives data acquired by a temperature and humidity sensor, an acceleration sensor, a plurality of tire temperature and pressure sensors, a camera, a Hall switch, a vehicle oil level sensor, a refrigeration oil level sensor and a GPS (global positioning system)
As a further improvement of the above scheme, the master control component adopts raspberry group.
As a further improvement of the scheme, the raspberry group component realizes communication through the narrowband internet of things.
As a further improvement of the scheme, the main control component sends the received data to the application end for display.
As a further improvement of the scheme, when the data collected by the temperature and humidity sensor, the tire temperature and tire pressure sensors, the vehicle oil level sensor and the refrigeration oil level sensor exceeds the corresponding threshold values, the alarm corresponding to the corresponding data alarms on the application end.
As a further improvement of the scheme, when the cold chain vehicle enters a left reversing state, the camera outside the right side of the carriage is started; when the cold chain vehicle enters a right reversing state, the left external camera of the carriage is started at the moment; when the cold chain vehicle enters a reversing state and a parking state, the outer camera at the rear side of the carriage is started.
The invention also discloses a computer, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the computer program running on the processor is used for realizing the cold chain vehicle running environment monitoring system based on wireless communication.
The invention also discloses a computer readable storage medium, on which a computer program is stored, which is used for realizing the cold chain vehicle running environment monitoring system based on wireless communication when being executed by a processor.
The beneficial effects of the invention are as follows:
1. The change of the pixel points of the image acquired by the camera is subjected to contour marking, so that the areas loaded with cargoes and the areas not loaded with cargoes can be displayed on the application end. The size of the residual unused area in the carriage can be obtained by calculating the size of the area where the cargo is not loaded, so that the space in the carriage can be further planned later, and the limited space in the carriage can be fully utilized.
2. The temperature and humidity data, the vehicle oil level data, the refrigeration oil level data and the tire temperature and pressure data are detected in real time and displayed on an application end, so that a driver can master various data of the vehicle in real time. When the temperature and humidity data, the vehicle oil level data, the refrigeration oil level data and the tire temperature and pressure data exceed the preset threshold values, the application end can correspondingly give an alarm, so that a driver is reminded of the faults of corresponding equipment.
3. And by collecting GPS data of the cold chain vehicle, reading corresponding data on an application end and drawing a corresponding running track route map, the specific moving route of the cold chain vehicle is convenient for others to grasp.
Drawings
Fig. 1 is a flowchart of a method for monitoring a cold chain vehicle running environment based on wireless communication disclosed in embodiment 1 of the present invention.
Fig. 2 is a flowchart of a method for calculating a free area of a cabin in a cold chain vehicle operation environment monitoring method based on wireless communication according to embodiment 1 of the present invention.
Fig. 3 is a schematic diagram of a main control component in a cold chain vehicle operation environment monitoring system based on wireless communication according to embodiment 2 of the present invention.
Fig. 4 is a schematic diagram of communication between an application end and a camera in a cold chain vehicle operation environment monitoring system based on wireless communication disclosed in embodiment 2 of the present invention.
Fig. 5 is a schematic diagram showing various data displayed by an application end in a cold chain vehicle operation environment monitoring system based on wireless communication disclosed in embodiment 2 of the present invention.
Fig. 6 is a schematic diagram illustrating internal communication of a cold chain vehicle operation environment monitoring system based on wireless communication according to embodiment 2 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
Referring to fig. 1, the present embodiment describes a method for monitoring the running environment of a cold chain vehicle based on wireless communication, which is used for calculating the size of the remaining area of the interior of a vehicle after loading and unloading cargoes. The monitoring method comprises the following steps:
And S1, collecting an empty carriage picture when cargoes are not loaded in the carriage, and dividing the empty carriage picture into a plurality of parts. And acquiring video pictures in the carriage in real time, and dividing the video pictures of each frame into a plurality of parts. The video pictures divided into a plurality of parts are in one-to-one correspondence with the empty box pictures of the plurality of parts. The carriage is emptied firstly, and then the inside of the carriage is imaged through a camera and the like, so that a corresponding empty carriage picture is obtained. Since the car is generally rectangular, the empty car frame is divided into a plurality of sections, which may be equally divided or unequally divided, depending on the situation in the field. After goods are placed in the carriage, video pictures in the carriage are collected in real time, and the video pictures are divided into a plurality of parts.
And step S2, respectively carrying out thresholding processing on the video pictures of each part to obtain new pixel values of each part. The thresholding method comprises the following steps:
Step S21, reading the empty carriage picture of each part to obtain a corresponding original pixel value; defining the intermediate value of each original pixel value as a corresponding threshold value. After the empty box picture is divided into a plurality of parts, the original pixel value corresponding to each part is read, and then the intermediate value of the original pixel value of each part is defined as a corresponding threshold value.
Step S22, after dividing the video picture into a plurality of parts, reading the video pixel value corresponding to each part.
Step S23, determining the threshold value of each portion and the magnitude of the video pixel value: ending if the video pixel value is equal to the threshold value; if the video pixel value is not equal to the threshold value, a new pixel value is assigned to the video picture of the corresponding portion.
And S3, drawing lines on the video picture of the part endowed with the new pixel value, marking the corresponding outline, and distinguishing the outline from the area without goods. When the video image corresponding to the part given with the new pixel value is marked with the outline, the area inside the outline can be whitened, the area outside the outline can be darkened, or the area inside the outline can be darkened, and the area outside the outline can be whitened, so long as the difference of the colors of the areas inside and outside the outline is enough.
And S4, outputting the video picture with the outline mark, and calculating the size of the spare area of the carriage. Referring to fig. 2, the method for calculating the free area of the carriage includes the steps of:
In step S41, the actual area of the car inside the car is calculated in advance from the empty car screen captured by the camera.
And S42, calculating the area of the carriage occupied by the goods through the video picture after the outline marking.
Step S43, obtaining the spare area of the carriage by the difference between the actual carriage area and the carriage area occupied by the cargoes.
In the embodiment, the change of the pixel points of the image acquired by the camera is subjected to contour marking, so that the area loaded with cargoes and the area not loaded with cargoes can be displayed on the application end. The size of the residual unused area in the carriage can be obtained by calculating the size of the area where the cargo is not loaded, so that the space in the carriage can be further planned later, and the limited space in the carriage can be fully utilized.
Example 2
Referring to fig. 3, the present embodiment describes a cold chain vehicle operation environment monitoring system based on wireless communication, which calculates the size of the remaining area after loading and unloading cargoes in the carriage according to the cold chain vehicle operation environment monitoring method based on wireless communication. The monitoring system comprises a temperature and humidity sensor, an acceleration sensor, a plurality of tire temperature and pressure sensors, an inner camera, an outer camera, a Hall switch, a vehicle oil level sensor, a refrigeration oil level sensor, a GPS and a main control component.
The temperature and humidity sensor is arranged inside the carriage and used for detecting the temperature and humidity inside the carriage in real time. The power supply voltage of the temperature and humidity sensor is 5v, data are transmitted through an IIC protocol, the temperature precision can reach + -0.4 ℃, the humidity precision can reach + -3.0 ℃ RH, and accurate temperature and humidity data can be obtained.
Referring to fig. 4, the camera communicates with the application end through the router. The cameras are divided into an inner camera and an outer camera. The outer camera sets up in the outside in carriage, and acceleration sensor cooperates with laying a plurality of outer cameras at the carriage back. Due to the acceleration principle, the distance between the mechanical element and the two electrodes is changed, so that the parameters of the capacitive element are changed, the change of the capacitance parameters is amplified through the switch capacitance, the voltage is output, an ADC (analog to digital converter) conversion circuit is integrated in the acceleration sensor, the parameters used for voltage conversion are transmitted to the main control assembly through an IIC (inter-integrated circuit) protocol, and then the state data are obtained. When the running state of the cold chain vehicle is changed, the state of the acceleration sensor is correspondingly changed. When the cold chain vehicle enters a left reversing state, the acceleration sensor detects a corresponding motion state, corresponding data are sent to the main control assembly, and the main control assembly controls the rear camera arranged on the right side of the carriage to work. When the cold chain vehicle enters a right reversing state, the acceleration sensor detects a corresponding motion state, corresponding data are sent to the main control assembly, and the main control assembly controls the rear camera arranged on the left side of the carriage to work. When the cold chain vehicle enters a reversing state and a parking state, the acceleration sensor detects a corresponding motion state, corresponding data are sent to the main control assembly, and the main control assembly controls the camera behind the carriage to work. When the state of the acceleration sensor changes, the state of the automobile is changed, the changed state data is sent to the cloud end, the application end displays the current state through reading, and the application end and the ip camera are in the same local area network through the router, so that the application end can read video data.
The plurality of tire temperature and pressure sensors measure the tire temperatures and pressures of the plurality of tires, respectively. Because the tire can be rubbed with the ground continuously in the running process of the cold chain vehicle, the temperature of the tire can be increased continuously. As can be seen from the expansion with heat and the contraction with cold, when the temperature rises, the tire pressure in the tire also rises, so that the temperature and the tire pressure of the tire gradually rise. If the tire temperature and pressure exceeds the threshold values, the tire may be damaged. In order to avoid the damage of the tire, a tire temperature and pressure sensor is arranged on the tire, so that a driver can conveniently grasp the tire temperature and pressure of each tire in real time, the tire can be cooled in advance, and the service life of the tire is prolonged. The data detected by the tire temperature and pressure sensors are transmitted to the main control assembly through the Bluetooth module, and the main control assembly is respectively communicated with the tire temperature and pressure sensors through the Bluetooth protocol through the BLE protocol, so that the detected data of the corresponding tire temperature and pressure sensors are obtained.
The inner cameras are arranged in the carriage of the cold chain car, and shoot the interior of the carriage to obtain corresponding pictures. The internal camera selects the CSI-2 serial interface camera, and the CSI-2 camera uses data differential signals in the data transmission process, so that a certain transmission rate can be met, and the whole carriage data can be acquired and monitored in real time and the size of the area can be calculated.
The Hall switch converts electromagnetic signals into electric signals, and the electric signals are transmitted into the main control assembly and are used for detecting the state of a carriage door of the carriage. When a sheet of metal or semiconductor, which is subjected to an electrical current, is placed vertically in a magnetic field, a potential difference is created across the sheet, a phenomenon known as the hall effect. The sensitivity of the Hall effect is in direct proportion to the magnetic induction intensity of the externally applied magnetic field. The Hall switch is based on Hall effect principle and is produced through integrated encapsulation and assembling process, and the Hall switch can convert magnetic input signal into electric signal for practical application and has the requirement of easy operation and reliability for industrial application.
The vehicle oil level sensor and the refrigeration oil level sensor both adopt ultrasonic measurement type oil level sensors. The ultrasonic measuring type oil level sensor sends out high-frequency pulse new height through the ultrasonic probe, the surface of the detected liquid level is reflected to form reflected waves, the reflected waves are received through the transducer and converted into electric signals, and the height of the liquid level is calculated through the receiving time. The vehicle oil level sensor and the refrigeration oil level sensor respectively measure the oil level and the cold engine oil level of the vehicle, and the main control component obtains oil level data through a serial port protocol.
The GPS obtains positioning data and transmits the positioning data to the main control assembly through a serial port protocol. The GPS adopts a GPS Beidou positioning function module, and other positioning modules can also be adopted, and in the embodiment, the GPS adopts the GPS Beidou positioning function module preferentially.
Referring to fig. 5, the main control assembly is configured to receive data collected by the temperature and humidity sensor, the acceleration sensor, the tire temperature and pressure sensors, the camera, the hall switch, the vehicle oil level sensor, the refrigeration oil level sensor and the GPS, and transmit the corresponding data to the application end for display. When the data collected by the temperature and humidity sensor, the tire temperature and pressure sensors, the vehicle oil level sensor and the refrigeration oil level sensor exceeds the corresponding threshold values, the alarm corresponding to the corresponding data alarms on the application end.
Referring to fig. 6, the master control module needs to process many data, collect video data, and process the video data. Therefore, the main control component selects the raspberry group component as a main control system. The raspberry pi component may support a variety of communication protocols and is capable of handling large amounts of data. The communication aspects within the raspberry-pie component are implemented by the NB-IOT module. NB-IOT, also known as narrowband internet of things, focuses on low power consumption and wide area coverage communication applications, enhancing the depth of communication coverage by enhancing the signal. The NB-IOT has three working states, namely a connection state, an idle state and an energy-saving mode. The three working states can be switched according to different configurations, and the energy-saving mode can be used for working, so that the function of low power consumption is achieved. The main control assembly sends an instruction to operate the NB-IOT module through a serial port protocol, the NB-IOT module is connected to the cloud end through a networking mode by identifying the equipment name and the equipment number, and data are sent to the cloud end through an MQTT protocol. The application end obtains cloud data through an interface protocol and records corresponding data in real time.
The main control assembly periodically polls and collects tire temperature and tire pressure data, collects temperature and humidity data in a carriage, obtains data of the current vehicle oil level and the refrigerator oil level through a serial port, and uploads the data to the cloud end through NB-IOT communication through the oil level data, the temperature and humidity data and the tire temperature and tire pressure data or through the cycle frequency of other fixed time, and an application end collects the cloud end data in real time and displays the cloud end data. When the detected temperature and humidity data, the detected vehicle oil level data, the detected refrigeration oil level data and the detected tire temperature and pressure data exceed the set threshold values, an alarm is given at the application end, so that a driver can grasp all data of the cold chain vehicle in real time.
The main control assembly collects GPS data in real time, the GPS data collected through the serial port is transmitted to the cloud end, the application end reads the cloud end data and then draws a track roadmap, and therefore the running track roadmap of the cold chain vehicle is obtained, and the moving route of the cold chain vehicle is easy to grasp for others.
According to the embodiment, the temperature and humidity data, the vehicle oil level data, the refrigeration oil level data and the tire temperature and pressure data are detected in real time and displayed on the application end, so that a driver can master various data of the vehicle in real time. When the temperature and humidity data, the vehicle oil level data, the refrigeration oil level data and the tire temperature and pressure data exceed the preset threshold values, the application end can correspondingly give an alarm, so that a driver is reminded of the faults of corresponding equipment.
According to the embodiment, the GPS data of the cold chain vehicle are collected, corresponding data are read from the application end, and a corresponding running track route map is drawn, so that people can master the specific moving route of the cold chain vehicle.
Example 3
The present embodiment describes a computer for operating a cold chain vehicle operating environment monitoring system based on wireless communications. The computer includes a memory, a processor, and a computer program stored on the memory and executable on the processor. The computer program running on the processor is used for realizing a cold chain vehicle running environment monitoring method based on wireless communication and a cold chain vehicle running environment monitoring system based on wireless communication.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims (10)

1. The cold chain vehicle operation environment monitoring method based on wireless communication is used for calculating the size of the residual area after goods are loaded and unloaded in a carriage, and is characterized by comprising the following steps:
Step S1, collecting an empty carriage picture when cargoes are not loaded in a carriage, and dividing the empty carriage picture into a plurality of parts; collecting video pictures in a carriage in real time, and dividing the video pictures of each frame into a plurality of parts; the video pictures divided into a plurality of parts are in one-to-one correspondence with the empty box pictures of the plurality of parts;
Step S2, thresholding is carried out on the video picture of each part to obtain new pixel values of each part; the thresholding method comprises the following steps:
step S21, reading the empty carriage picture of each part to obtain a corresponding original pixel value; defining the intermediate value of each original pixel value as a corresponding threshold value;
step S22, reading each part of the video picture to obtain a corresponding video pixel value;
Step S23, determining the threshold value of each portion and the magnitude of the video pixel value: ending if the video pixel value is equal to the threshold value; if the video pixel value is not equal to the threshold value, a new pixel value is given to the video picture of the corresponding part;
Step S3, drawing lines on the video picture of the part endowed with the new pixel value, marking the corresponding outline, and distinguishing the outline from the area without goods;
and S4, outputting the video picture with the outline mark, and calculating the size of the spare area of the carriage.
2. The method for monitoring the operating environment of a cold chain vehicle based on wireless communication according to claim 1, wherein in step S4, the method for calculating the free area of the cabin comprises the steps of:
step S41, calculating the actual carriage area through the empty carriage picture;
step S42, calculating the area of the carriage occupied by the goods through the video picture after the contour mark;
Step S43, obtaining the spare area of the carriage by the difference between the actual carriage area and the carriage area occupied by the cargoes.
3. A cold chain vehicle operating environment monitoring system based on wireless communication, the monitoring system comprising:
A temperature and humidity sensor for detecting the temperature and humidity in the vehicle cabin;
The acceleration sensor is used for collecting the running condition of the cold chain vehicle;
a plurality of tire temperature and pressure sensors for detecting tire temperatures and pressures of a plurality of tires, respectively;
The inner camera is used for collecting images inside the carriage;
a hall switch for detecting a state of a cabin door;
A vehicle oil level sensor for detecting an amount of oil of a vehicle;
a refrigerant oil level sensor for detecting an amount of oil of the refrigerant;
a GPS for detecting a position of the cold chain vehicle; and
The main control component calculates the size of the remaining area after goods are loaded and unloaded in the carriage according to the cold chain vehicle running environment monitoring method based on wireless communication as claimed in claim 1 or 2, and receives data collected by a temperature and humidity sensor, an acceleration sensor, a plurality of tire temperature and pressure sensors, a camera, a hall switch, a vehicle oil level sensor, a refrigeration oil level sensor and a GPS.
4. The wireless communication based cold chain vehicle operating environment monitoring system of claim 3, wherein the master control component employs a raspberry pi component.
5. The wireless communication-based cold chain vehicle operating environment monitoring system of claim 4, wherein the raspberry group component communicates through a narrowband internet of things.
6. The system of claim 3, wherein the master control module transmits the received data to the application terminal for display.
7. The system for monitoring the running environment of the cold chain vehicle based on wireless communication according to claim 3, wherein when the data collected by the temperature and humidity sensor, the plurality of tire temperature and pressure sensors, the vehicle oil level sensor and the refrigerating oil level sensor exceeds the corresponding threshold values, an alarm corresponding to the corresponding data is used for alarming at an application end.
8. The cold chain car operation environment monitoring system based on wireless communication according to claim 3, wherein when the cold chain car enters a left reversing state, an external camera at the right side of the carriage is started; when the cold chain vehicle enters a right reversing state, the left external camera of the carriage is started at the moment; when the cold chain vehicle enters a reversing state and a parking state, the outer camera at the rear side of the carriage is started.
9. A computer comprising a memory, a processor and a computer program stored on the memory and executable on the processor for implementing the wireless communication based cold chain vehicle operating environment monitoring system according to claims 3 to 8.
10. A computer readable storage medium, having stored thereon a computer program for implementing the wireless communication based cold chain vehicle operating environment monitoring system according to claims 3 to 8 when executed by a processor.
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