Traffic safety is valued as car surveillance products become popular

With the vigorous development of the public transportation industry, the safety and management of the operating personnel in the operation process are increasingly valued. It is necessary to install a mobile monitoring system in the bus. The cities where buses are equipped with vehicle-mounted products are mainly concentrated in China's economically developed regions, such as the Pearl River Delta and the Yangtze River Delta. Recently, because of public safety and industry management requirements and other factors, there is also a demand for bus-mounted on-board monitoring products in second and third-tier cities in China. Increasingly rising, coupled with more and more mature vehicle monitoring equipment technology, higher and lower cost, making most of the city's buses installed onboard monitoring products become possible.

The monitoring needs to be clear. The construction of the bus security system started relatively late. It has only improved a bit in recent years and has continued to develop along with the progress of the security industry. Vehicle monitoring is self-contained and it is a small mobile monitoring site. Different application requirements have different installation solutions. Generally, the following points are included.

Security monitoring:

As buses are used as public travel tools, all kinds of people will stay here. Therefore, some lawbreakers have set their sights on public transport, making buses a frequent source of thefts and other public security cases. So public security agencies will install the number of vehicles in the trains through the bus companies. One vehicle condition surveillance camera, generally one for the front door and one for the rear door, is used to monitor the conditions of getting on and off the passengers. The front of the cabin and the back of the cabin are also equipped with a camera for monitoring the situation inside the cabin.

Drivers, conductors monitoring:

Bus companies pay more attention to their own personnel issues, through the monitoring equipment to understand the work inside the car, such as the camera in front of the carriage to the driver, you can check the driver's operating specifications, whether there is indecent behavior, etc., to facilitate supervision of driver self-discipline driving; Also install the camera, check the ticket sales, and supervise the ticketing work;

Front monitor:

In the process of driving, buses may encounter some sudden traffic events, such as changing lanes, rear-end collisions, etc. After a traffic accident occurs, the responsibility can be determined through video recording; at the same time, the video captured by the front camera is transmitted to the background. Can also be used as a background to understand the vehicle driving conditions (car position, speed, road congestion) information sources, to facilitate the background of command and dispatch;

Car monitoring:

Can be used in reverse, after the rear-end and other circumstances, the camera is placed behind the car, when the driver performs a reverse action, the car display will automatically switch to the rear monitoring channel;

There is also vehicle-side monitoring, which is used to monitor the situation of getting on and off the passengers and running on both sides of the vehicle.

China's public transport security monitoring is mainly focused on security monitoring and monitoring of drivers and ticket sellers. Additional applications are required for other applications. “The current common bus-borne surveillance is still implemented as analog cameras plus vehicle-mounted DVRs or analog cameras plus vehicle-mounted DVSs. Vehicle-mounted DVRs/vehicle DVSs generally use 3-way video access, and some cities use 5-channel video access, 5 channels. The video access is more video-capturing than the three-channel video access system." Zhang Bing, the sales and support manager of Shenzhen Langchi Xinchuang Technology Co., Ltd., introduced it.

With regard to the construction of on-board monitoring systems, various manufacturers have different R&D goals. For example, clarity and other specifications will vary. According to Jin Sanli Zhang Jingwu, most of the cameras used in bus monitoring systems are infrared night vision hemispheres. , Resolution 420 lines / 480 / 540 lines of three grades, night vision distance of up to 15 meters, built-in pickups, so that audio and video synchronization video, connector for the professional aviation head. Zhuang Weiyong, sales director of security product line of Shenzhen Tongzhou Electronics Co., Ltd., believes that low illumination is more suitable for bus security monitoring. “Infrared is able to provide infrared light that is invisible to the human eye during night vision. Shooting an object is a tool to improve brightness assistance. The vehicle does not have a completely dark interior during night driving. It is somewhat shimmery. Low illumination (0.01Lux@F1.2) is weak in night vision (or starlight). Under the light, it is possible to capture clear images by color-to-black, and no infrared light is required, so cameras with infrared functions can be excluded.” Therefore, they use the SONY1/3 “SuperHADCCD high-sensitivity sensor low-light camera. The resolution is 530 lines, and the equipment is required to have automatic gain control, automatic white balance, backlight compensation, etc. Of course, in order to better see the face, you can also use higher resolution products.For ease of installation and debugging, camera lens Must be three-axis adjustable, and use short-focus wide-angle lens (maximum viewing angle up to 90 °), making the monitor screen range The resolution surveillance camera is D1, face, action, etc. can see, the car can meet the monitoring requirements; and monitoring at night, which should be determined using the low-light technology to capture the actual situation and cost estimates.

In addition, the construction must also pay attention to: buses are generally more dirty, chaotic, so the camera must have a certain degree of waterproof, dustproof performance, if it is installed in the car, but also have a good explosion-proof performance. In actual operation, the camera must be installed firmly. To withstand the frequent shaking test of the car, the camera is always in consistent swing with the body, so that the captured image will not be shaken.

The storage should be stable. As the bus plays the role of a mobile island, it cannot directly access the wired network. After the camera collects the image information, it uploads it to the onboard hard drive for temporary storage. Due to the special conditions of the bus, there will be vibrations at any time, which puts high demands on the onboard storage technology.