First, the train carriage monitoring should achieve four major goals
The railway is the main artery of China's national economy. Railway passenger transport has occupied a pivotal position in China's personnel transportation for a long time. Railway passenger car safety has always been valued by the State and the Ministry of Railways as a major event affecting the country and passengers' lives and property. In the past two years, various public security accidents in railway passenger transport have gradually increased. Malignant fires, explosions and terrorist murders have seriously threatened the safety of the country and passengers' lives and property. Therefore, improving the monitoring and management means of public security on the vehicle, improving the efficiency of public security work, enhancing the surveillance capability of the vehicle and adapting to the needs of railway passenger transportation safety is a real problem that needs to be solved urgently.
With the maturity and wide application of GPS satellite positioning technology, 3G/4G communication technology and GIS geographic information system technology, it is possible to apply the latest technology to develop an intelligent train management system. The author believes that according to the actual needs of customers, using the existing information resources, the train compartment monitoring system should achieve the following goals in the future:
1. Collect train video images and other related information, provide basis for timely and accurate discovery of illegal criminal activities, investigation and collection of evidence, handling of emergencies, equipment maintenance, etc., to achieve intelligent train scheduling and precise management.
2. The train and control center can form a local area network, and the server is planned to be deployed in the control center. The control center sets up the server, terminal, storage backup device, and projects the video to the video wall of the control center, enabling the on-duty personnel to monitor the condition of the car in real time.
3. Set the terminal (monitor) on the vehicle, and the on-duty personnel can monitor the scene and voice broadcast at any time.
4. Introduce wireless communication technology, computer technology and network technology to realize on-site monitoring and voice intercom, which makes the overall quality of the train company have a qualitative leap, improve the operation management and quality service level of the train.
Second, H.265 technology can solve the high-definition video wireless network transmission and high-definition video storage requirements in the car
The traditional car video surveillance is mainly based on simulation. With the rapid development of technology, the demand for on-board monitoring HD has become more and more vigorous. In fact, high-definition surveillance has never been just the high-definition of surveillance cameras, but the high-definition of the entire system, involving acquisition, encoding, transmission, storage, decoding and other aspects. The development of higher definition also requires the simultaneous development of all links. Similarly, monitoring in the train compartment will inevitably go through this phase.
1. Car image wireless transmission, H.265 can meet ultra low bit rate transmission
In the high-definition 1080p era, the application of H.264 code stream can well penetrate the entire line of the HD system, meeting the needs of each link. However, when moving to higher definition, H.264 has been stretched, and it is difficult to synchronize all the links, and the code stream runs smoothly all the time, especially the huge cost of network and storage brought by it. At this time, H. The emergence of 265 brings hope to people. H.265 improves the compression performance by more than 1 time than H.264, effectively "slimming" the code stream running through the high-definition monitoring system, and perfectly connecting the higher-definition links once again. One of the great advantages of using H.265 encoding and decoding is that it provides video of the same quality at half the bit rate of current mainstream encoded video. For security, its "all-powerful" ultra-low code rate will become the mainstream of future security monitoring.
The use of the H.265 standard protocol results in faster processing efficiency. When it comes to the networking of high-definition systems, under the existing 4G network, the actual tested upstream bandwidth is in the range of 1M to 2M. The bandwidth resources and network stability are very valuable. How to improve the processing efficiency faster, so that the existing compression standard encounters the bottleneck again. . Taking 1080p full HD monitoring as an example, the current video compression standard generally requires a code rate of 4M or higher to ensure image quality, which also makes it difficult to stably transmit HD video under 4G network. If H.265 encoding is used, according to the existing test, 1080p only needs a code rate of about 1M ~ 2M, and the SD D1 format of the early system construction can only achieve a code rate of about 1.5M ~ 2M, which is for HD system. The construction is a great temptation. For example, the road is compared to a 4G network, and the vehicle is compared to the video stream. The arrival of H.265 will make the originally congested security road instantly smooth. Imagine that the four-lane road has the same width. If the vehicle is more than doubled, then the four lanes will become 8 lanes, which will effectively alleviate the congestion of the security road. H.265 once again changed the security HD horizon. .
2. The car image is saved locally, H.265 can achieve smaller storage
Using the H.265 standard protocol, you can achieve smaller storage capacity on the back end - video resolution from CIF → D1 → 720p → 1080p, the most troublesome is the storage problem caused by the increase in data volume, but if H.265 is adopted To reduce the stream, a storage pool that could only accommodate 1000 cameras, can now hold 2,000 or more without increasing the cost of storage.
On the road of popularization of H.265, the security company where the author is located promoted the development of H.265 video compression standard in H.265 products, applications and supporting technologies, and successively launched related products supporting H.265. I believe that H.265 developed from H.264, with its system-down compatibility, H.265 will gradually become the mainstream choice for video compression in the security industry.
Third, the intelligent application needs of the cabin monitoring
The traditional monitoring technology has a huge amount of information. The search and query is time-consuming and difficult to locate. The demand for monitoring intelligent technology has emerged. The monitoring intelligence requirements for train cars mainly include the following aspects:
Face detection alarm
After the face detection detection is enabled, the face detection information can be linked to the alarm bullet map, the sound warning, the upload center, the sending mail, and the triggering alarm output. Taking train car monitoring as an example, the monitoring channel in the car can be set to link the sound warning and send the mail when the face is detected (the screenshot is attached to the mail). When a suspicious person tries to enter the car, the security can be effectively reminded to reduce The probability of an accident occurring, the screenshot in the email can be verified as evidence after the fact.
2. Behavior detection alarm
By enabling cross-border detection/area intrusion detection, cross-border detection and area intrusion detection information can be linked to alarm bullet maps, sound warnings, upload centers, send mails, and trigger alarm outputs. For the position of the cabin attendant, the trainmaster's office, the cab, etc., cross-border detection can be set. When someone tries to cross the fence, the alarm output can be linked to prevent the pedestrian from crossing the fence.
3. Audio anomaly detection alarm
By enabling audio anomaly detection, the audio anomaly information can be linked to an alarm bullet, an audible warning, an upload center, an e-mail, and an alarm output. If the audio anomaly detection event alarm can be set in the car, when the prisoner gathers the fight, the sound warning can be pulled in time and the relevant duty personnel can be reminded.
4. Intelligent post-recording search
Supports fast retrieval based on intelligent detection events; supports post-recording retrieval based on regional intrusion and cross-border detection, and can customize intelligent rules for quick retrieval during playback, and video search can be freely desired.
If there is a vehicle theft in a car, the passenger will only report the alarm after a week's business trip. At least one week of video file playback is required. It takes a week to play the playback file normally. It needs to be played at the fastest speed. It is difficult to see the video in one day and in the fastest playback mode. At this point we can use the intelligent monitoring system in this article to complete quickly and easily. We put an area on the vehicle in the video file and click on the search to quickly search for the relevant video file that invaded the vehicle.
5.Intelligent post-recording condensed playback
During video playback, videos with events such as smart detection are played at normal speed; recordings without events automatically play at 16x speed, effectively improving video playback efficiency. For the normal speed playback of the relevant video files invading the car, the video of the stolen time in the car can be quickly and accurately located, effectively improving the efficiency of the case.
4. What kind of products can meet the needs of on-board monitoring products in train cars?
1. With a professional scheduling platform
High-efficiency audio and video codec technology, wireless transmission technology, GIS technology, massive data storage in retrieval technology, through professional scheduling platform software, can achieve real-time video monitoring, operational report statistics, service support, rich electronic map function, video surveillance Seamless integration with GIS has greatly improved the operation management and quality service level of train companies, and effectively solved the problems faced by current train companies.
At the same time, it can provide users with various customizable services such as video surveillance, voice intercom, video recording, video playback, network video matrix, equipment inspection and system log to meet the various application needs of users. In the future, we recommend customers. It can do related service functions such as alarm linkage and intelligent analysis.
2. Video surveillance combined with GPS positioning
Car monitoring needs to fully consider the needs of mobile monitoring, combined with leading audio and video codec technology, GPS satellite positioning, wireless network transmission and other technologies to form an advanced rapid deployment of train video surveillance system. The system can not only monitor the location of the vehicle in real time, but also monitor the real situation of the scene through the on-board wireless video through the wireless video transmission technology monitoring command center.
3. Compact product and high integration
The traditional train video surveillance system generally adopts the method of vehicle monitoring and GPS separation. The result is that the equipment connection is complicated and the connection is large, which leads to the problem of low reliability in the environment of large vibration, and this way Two communication cards are required, which obviously has a problem of high cost. Therefore, at present, the built-in GPS module of the car hard disk recording host is generally required to solve the problem that has plagued the user for a long time.
4. Strong environmental adaptability
The vehicle hard disk video recording host product not only needs to meet the harsh climate environment, but also should be able to withstand the harsh electromagnetic environment; its camera also needs to meet the outdoor use requirements, its protection level is IP66; if the car DVR power supply design refers to ISO7637- 2:2004 "Road vehicles - electrical disturbance caused by conduction and coupling" standard design, can filter power glitch up to DC 153V, to ensure the stable operation of the equipment. The power supply has been specially designed to provide functions such as open circuit, short circuit, over current and overload protection, which plays an important role in ensuring normal operation of the equipment.
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