Design and Implementation of Safety Monitoring System for Railway Station Non-Safe Area Based on Image Processing Technology

At present, China's high-speed rail construction is in full swing. The use of high-speed cameras to capture images and wireless data transmission technology and image processing technology to achieve safety monitoring of high-speed rail stations in non-safe areas will be very important for the train's punctual operation and to ensure the personal safety of the platform.

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Design and Implementation of Safety Monitoring System for Railway Station Non-Safe Area Based on Image Processing Technology

Overview

The safety monitoring of non-safe areas of railway stations is an effective auxiliary means to ensure passenger safety and train punctuality when trains enter and leave the station. Traditional laser scanning methods monitor and there is a blind zone between laser beams, resulting in high false positive rate. In view of the problems existing in laser monitoring and the development of digital video technology, the real-time monitoring system for stations in the non-safe area based on the advanced video surveillance technology, video motion detection technology, image processing technology and wireless transmission technology is very Necessarily, the system uses a high-speed digital camera to cover the non-safe area of ​​the railway station, and video images the obstacles in the non-safe area during the train entry and exit. Through the comparison and calculation of the image, it is analyzed whether the non-safe area of ​​the station has Whether the presence of obstacles affects the train entry and exit station, and sends the analysis results to the train driver, the station attendant and the station duty room attendant in real time, providing an effective auxiliary basis for judging the safety status of the platform when the train enters and exits the station, which is to reduce the safety accident. The occurrence of the most effective means of monitoring the safety of trains entering and leaving the station and the safety of station staff and passengers. (see picture 1)

Platform non-safe area schematic

System Components

The station non-safe area security monitoring system is mainly composed of wireless data transmission, station video image acquisition and processing, station duty room monitoring system, station attendant hand-held machine and train driver room alarm device.

Wireless data transmission

In terms of data transmission, we establish wireless local area network to fully cover all stations, monitor the video images captured by the camera, the results of image data processing, alarm signals in the non-safe area with obstacles, station duty room and station attendant Information exchange and information exchange between the station duty room, the station attendant and the train driver's cab can be transmitted wirelessly.

Platform video image acquisition and processing

Most train stations are basically non-enclosed environments. Considering the direct sunlight and other external factors (lights, flying insects, dust, etc.), we set up four HD cameras at each station, which are placed at the two ends of the platform, two at each end. The cameras are placed at different angles to avoid direct sunlight. At the same time, the four cameras can completely cross-monitor the non-safe areas of the platform, so that the monitoring system can obtain four static images at the same time, and comprehensively compare and analyze four images at different angles. Accurately determine the real-time status of the non-safe area of ​​the station, avoiding misjudgment and false alarms due to single camera failure, single image angle and other external factors (flying insects, lens sticking to foreign objects, etc.).

According to the location of the processing terminal deployment, it is divided into a front-end processing mode and a back-end processing mode.

Front-end processing mode

All cameras adopt wired network programmable cameras. Firstly, a single captured video image is processed and analyzed by a camera processing program, and then transmitted to the station image data processing device by wire, and is completed by the station image data processing device. The comparison processing analysis of the four-way video images yields the analysis processing results, and the analysis processing results in the case of obstacles are wirelessly transmitted to the station duty room monitoring system, the station attendant handset, and the train driver room alarm device. Front-end processing wireless data transmission schematic (see Figure 2)

Front-end processing wireless data transmission diagram

advantage:

The video image acquisition camera and the image processing device are connected by wire before, and have high reliability and stability.

The image data processing part of each station is independent of each other. If the data processing device fails or the processing program fails, it only affects the operation of the platform system and does not affect the operation of other station systems.

Disadvantages: Data processing equipment is duplicated, equipment utilization is low, and system integrity is not strong.

Backend processing mode

All cameras use wireless network programmable cameras. Firstly, a single captured video image is processed and analyzed by the camera processing program, and then wirelessly transmitted back to the station duty room monitoring system. The four duty images are completed by the station duty room monitoring system. Comprehensive comparison processing analysis, the analysis and processing results are obtained, and the analysis and processing results in the case of obstacles are transmitted wirelessly to the station attendant handset and the train cab alarm device in real time by the station duty room monitoring system.

Advantages: The system has good integrity, simple structure, centralized analysis, centralized management, and high equipment utilization.

Disadvantages: Image data processing is completed in the station duty room processing terminal, and all data transmission depends on the wireless network, and the stability and reliability are relatively low.

The image data processing of all stations is completed by the station duty room image data processing program. When the data processing equipment fails or the processing program appears BUG, ​​all the platform systems cannot operate normally.

Station duty room monitoring system

Display, store and alarm the front-end analysis processing results in the front-end processing mode. In the back-end processing mode, the processing and analysis of the video images transmitted back by each station is realized, and an alarm signal is sent in real time to the train driver's room alarm device and the station attendant handset in the presence of an obstacle.

Station attendant handset

The station attendant receives the analysis processing result and the alarm prompt in the state of the obstacle in the non-safe area.

Train driver's cab alarm

The train driver's cab receives alarm signals and alarm prompts in the non-safe area with obstacles.

System principle

Monitoring when the train enters the station

Manually start the monitoring system

When the train enters the station, the duty officer on the station duty station passes the platform duty monitoring system or the station attendant through the handset, determines the station that the inbound train enters according to the train information of the station, and starts the monitoring system of the corresponding station. At the same time, the station monitoring system analyzes the train monitoring device entering the wireless network, determines the train entering the station, obtains the train information through the TAX box data of the inbound train, and establishes the communication between the platform and the train after analysis and judgment.

Automatic start monitoring system

A monitoring device is arranged at the exit of the station outside the road. When a train enters the corresponding channel, the monitoring device sends a start signal to activate the corresponding station monitoring system. At the same time, the station monitoring system analyzes the train monitoring device entering the wireless network, determines the train entering the station, obtains the train information through the TAX box data of the inbound train, and establishes the communication between the platform and the train after analysis and judgment.

Monitoring when the train leaves the station

When the train exits from the station, the duty officer on the station duty room starts the monitoring system of the corresponding platform at the same time as the command to issue the vehicle, or starts the monitoring system through the handset while receiving the order from the station. After the train leaves the station, the monitoring system is turned off by the station duty room attendant or the station attendant.

System functions

Station duty room monitoring system

Real-time monitoring image display function of each station;

Hard disk storage and playback functions of each station monitoring image;

Start and pause control functions of each station monitoring device;

Realize the comparison processing analysis of each station monitoring image; determine whether there is an obstacle in the non-safe area; and send the analysis processing result and alarm signal to the station attendant handset and the train cab monitoring device; (in the back-end processing mode);

Voice alarm function in the non-safe area of ​​each station in the obstacle state;

Over-the-counter train information database maintenance function.

Station attendant handset

The alarm signal and the voice prompt function of the obstacle in the non-safe area during the entry and exit of the station train;

The information of the monitoring image analysis processing result of the station is displayed, and the obstacle information of the non-safe area is grasped in time;

The start and pause control functions of the monitoring equipment of the station;

Cross-station train information database query function.

Train driver's cab alarm

Receive an alarm signal of an obstacle in the non-safe area during the entry and exit of the station train and voice prompt.

Conclusion

In the current period of vigorously developing high-speed railways, passenger trains and EMU trains have very high requirements on train running time and safety, and it is particularly important to ensure the safety of non-safety areas. The use of high-speed cameras to capture images and wireless data transmission technology and image processing technology to achieve safe monitoring of the station's non-safe areas is completely feasible in terms of technology and function. For example, it will be applied to all medium and small stations of high-speed railways. The punctual operation and the safety of the platform are very important.

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