Security bayonet system monitoring application architecture analysis
2023-05-26 09:11:13
The security bayonet is a comprehensive system integrating coil detection, image acquisition, license plate recognition, and data communication, and has a wide range of application prospects and strong technical expertise. At present, the status quo is that each company is in its own way, with varying levels of strength and uneven strength.
First, the system architecture
Security bayonet is generally divided into two parts: front-end and back-end, but with the popularization of optical fiber, many front-end devices (such as IPCs) have been moved to the back-end. Because of our vast territory, the cold weather in the north, and the hot and humid heat in the south, the IPC is a good choice for moving to the back end. However, the specific conditions are very different, and sometimes the IPC is also a last resort.
Second, the image acquisition unit
At present, the image capture system is divided into standard definition and high-definition (of course, there are also bold ones who use SLR digital cameras as capture units. This is just a joke, but some companies do dare to do so).
The advantage of SD is the quality is stable, the disadvantage is too few pixels (788 × 288 pixels), can not see the cab situation. There is a solution for pressing the centerline SD bayonet: a standard definition camera is added to the centerline. When the vehicle presses the centerline, the license plate recognition software identifies the complete license plate photo, and discarding the license plate is not good. Methods.
The advantage of HD is that the pixels are very high (currently 1.4 million pixels are 1392×1040 pixels). Whether the photographs taken day or night can clearly distinguish the appearance of the personnel in the cab, this can be of great help in criminal cases. The practical examples are numerous. Disadvantages are: 1. The amount of instantaneous data is very large, and the requirements for cameras and IPCs are very high, which directly or indirectly causes system instability. 2. The stability of HD cameras needs to be improved. If the HD network camera crashes or soft-resets, the communication between the IPC and the camera is interrupted, causing system crashes and other situations to occur. 3, high prices of high-definition, for the economy is not very wealthy areas, and stop. But with the increasing popularity of high-definition, the price of high-definition bayonet will eventually come down.
There is also an advantage of HD worthy of praise: automatic gain and auto shutter function. With this function, even if it is overcast or rainy, the photos taken are as clear and the HD camera automatically changes its gain and shutter time to make the photos work best.
The advantages and disadvantages of SD and HD are self-evident. Good technology will eventually eliminate backward technologies. HD is replacing SD as a major trend.
Third, the detection unit
There is still a battle between coil detection and video detection as the electronic* detection method. The coil detection method is troublesome (need to break the road), but the detection accuracy is as reliable as day and night; video detection is convenient, but the detection effect at night is indeed unsatisfactory. I personally think that the bayonet system is best to use the coil detection method (the most clumsy way may be the most secure way). In some other places, radar or microwave methods are used. I do not know how accurate it is, so please correct me.
Fourth, the data communication unit
At present, most of the data communication uses 485 communication, but Tianhe company adopts CAN communication. The use of CAN communication has some advantages over 485. There are many data in this area and I will not go into details (this technology was funded by the SME Innovation Fund of the Ministry of Science and Technology).
Fifth, the background processing unit
Because the bayonet must be networked with the vehicle management system, the oracle database is generally used.
Six, is embedded or industrial computer
Embedded is the future trend. The embedding referred to here is a snapshot machine that integrates a web camera and an industrial computer. Currently, the use of embedded operating systems or boards in the industry is referred to as embedded, which is to be distinguished from this.
Due to the bad environment of the bayonet system, IPCs, snapshot units, detection units, communication units, and transmission units have numerous links and the chance of failure is high. And the IPC is the bottleneck. The use of a scratch machine is the best choice. TI company provides DM355 technical support, and it will not be difficult for each manufacturer to produce a capture machine.
Seven, is linux or xpe
The Linux system is indeed very stable, the system is streamlined, and the operation speed is fast. However, it is difficult to develop and it is difficult to maintain the system later. My company also has the experience of using and developing linux. Post-maintenance is a nightmare for users. Xpe also has its advantages: remote desktop login, EWF technology anti-virus and anti-misoperation (like a hard disk protection card in an Internet cafe), easy maintenance and use, and rapid development. These advantages are unmatched by Linux. At present, many companies use XPE + DOM technology, not afraid of power, the xp can be done very small (200M or 300M), the speed is also very fast. However, XPE also has its own bugs. Our company has encountered this situation: The trimmed xpe runs normally, but once the power is turned off, the computer system time is reduced by one hour, and every time. There are various BUGs that make people strange. However, these problems are minor problems that can be solved. For the user is easy to use is the absolute truth.
Eight, system self-healing ability
We think that the intelligent transportation system must increase the self-healing function (ie self-healing ability). A lot of system design links, failure is normal, if there is no self-healing function is a terrible thing. We have added internal and external watchdogs in all development systems. Once certain parts of the system fail, the system will automatically repair until it is resolved. The system can automatically repair for most failures.
To sum up: We believe that the future trend of the security bayonet system is: HD network cameras, embedded HD capture machine.
First, the system architecture
Security bayonet is generally divided into two parts: front-end and back-end, but with the popularization of optical fiber, many front-end devices (such as IPCs) have been moved to the back-end. Because of our vast territory, the cold weather in the north, and the hot and humid heat in the south, the IPC is a good choice for moving to the back end. However, the specific conditions are very different, and sometimes the IPC is also a last resort.
Second, the image acquisition unit
At present, the image capture system is divided into standard definition and high-definition (of course, there are also bold ones who use SLR digital cameras as capture units. This is just a joke, but some companies do dare to do so).
The advantage of SD is the quality is stable, the disadvantage is too few pixels (788 × 288 pixels), can not see the cab situation. There is a solution for pressing the centerline SD bayonet: a standard definition camera is added to the centerline. When the vehicle presses the centerline, the license plate recognition software identifies the complete license plate photo, and discarding the license plate is not good. Methods.
The advantage of HD is that the pixels are very high (currently 1.4 million pixels are 1392×1040 pixels). Whether the photographs taken day or night can clearly distinguish the appearance of the personnel in the cab, this can be of great help in criminal cases. The practical examples are numerous. Disadvantages are: 1. The amount of instantaneous data is very large, and the requirements for cameras and IPCs are very high, which directly or indirectly causes system instability. 2. The stability of HD cameras needs to be improved. If the HD network camera crashes or soft-resets, the communication between the IPC and the camera is interrupted, causing system crashes and other situations to occur. 3, high prices of high-definition, for the economy is not very wealthy areas, and stop. But with the increasing popularity of high-definition, the price of high-definition bayonet will eventually come down.
There is also an advantage of HD worthy of praise: automatic gain and auto shutter function. With this function, even if it is overcast or rainy, the photos taken are as clear and the HD camera automatically changes its gain and shutter time to make the photos work best.
The advantages and disadvantages of SD and HD are self-evident. Good technology will eventually eliminate backward technologies. HD is replacing SD as a major trend.
Third, the detection unit
There is still a battle between coil detection and video detection as the electronic* detection method. The coil detection method is troublesome (need to break the road), but the detection accuracy is as reliable as day and night; video detection is convenient, but the detection effect at night is indeed unsatisfactory. I personally think that the bayonet system is best to use the coil detection method (the most clumsy way may be the most secure way). In some other places, radar or microwave methods are used. I do not know how accurate it is, so please correct me.
Fourth, the data communication unit
At present, most of the data communication uses 485 communication, but Tianhe company adopts CAN communication. The use of CAN communication has some advantages over 485. There are many data in this area and I will not go into details (this technology was funded by the SME Innovation Fund of the Ministry of Science and Technology).
Fifth, the background processing unit
Because the bayonet must be networked with the vehicle management system, the oracle database is generally used.
Six, is embedded or industrial computer
Embedded is the future trend. The embedding referred to here is a snapshot machine that integrates a web camera and an industrial computer. Currently, the use of embedded operating systems or boards in the industry is referred to as embedded, which is to be distinguished from this.
Due to the bad environment of the bayonet system, IPCs, snapshot units, detection units, communication units, and transmission units have numerous links and the chance of failure is high. And the IPC is the bottleneck. The use of a scratch machine is the best choice. TI company provides DM355 technical support, and it will not be difficult for each manufacturer to produce a capture machine.
Seven, is linux or xpe
The Linux system is indeed very stable, the system is streamlined, and the operation speed is fast. However, it is difficult to develop and it is difficult to maintain the system later. My company also has the experience of using and developing linux. Post-maintenance is a nightmare for users. Xpe also has its advantages: remote desktop login, EWF technology anti-virus and anti-misoperation (like a hard disk protection card in an Internet cafe), easy maintenance and use, and rapid development. These advantages are unmatched by Linux. At present, many companies use XPE + DOM technology, not afraid of power, the xp can be done very small (200M or 300M), the speed is also very fast. However, XPE also has its own bugs. Our company has encountered this situation: The trimmed xpe runs normally, but once the power is turned off, the computer system time is reduced by one hour, and every time. There are various BUGs that make people strange. However, these problems are minor problems that can be solved. For the user is easy to use is the absolute truth.
Eight, system self-healing ability
We think that the intelligent transportation system must increase the self-healing function (ie self-healing ability). A lot of system design links, failure is normal, if there is no self-healing function is a terrible thing. We have added internal and external watchdogs in all development systems. Once certain parts of the system fail, the system will automatically repair until it is resolved. The system can automatically repair for most failures.
To sum up: We believe that the future trend of the security bayonet system is: HD network cameras, embedded HD capture machine.
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