Wireless on-board surveillance technology is rising with the development of video surveillance technology. Before networking, on-board surveillance products mainly imitate standard definition. In recent years, with the rapid development of security IP, high-definition network has become the mainstream of shopping malls. The richness of camera functions and license plate recognition skills have been further developed. The development of vehicle monitoring skills shows a trend of diversification and acceleration of iteration.
Use of 3G/4G and Wireless Vehicle Monitoring Skills
Because of the continuous movement of vehicles, wireless communication network skills become the only choice for vehicle video surveillance to carry out data transmission and operation. At that time, with the breakthrough of communication skills in the field of 3G/4G, 3G/4G wireless mobile skills became the mainstream wireless communication skills in domestic shopping malls at that time. As a part of mobile surveillance, vehicle-mounted surveillance can complete long-distance video reading, long-distance control, geographic location, voice intercom and other functions through 3G/4G network. It satisfies the needs of customers for long-distance video inspection and long-distance emergency command. It provides wireless video surveillance service to users anytime and anywhere. Guangzhou is used in police vehicle patrol, mobile command vehicle and finance. Escort truck, etc. Together, wireless portable monitoring system can be selected to satisfy the user's needs, due to the limitations of some special occupations.
As far as mainstream manufacturers are concerned, the general vehicle monitoring system consists of three parts: vehicle terminal, 3G/4G network and monitoring center. Vehicle terminal is the front-end equipment of wireless vehicle monitoring system. It is usually hidden in various vehicles. Vehicle terminal equipment mainly consists of wireless vehicle terminal, tablet computer, high-definition vehicle platform camera, vehicle device bracket and equipment box. When the system is open, it can read pictures in real time through a tablet computer, control the rotation of the vehicle-mounted pan-tilt camera, and carry out two-way voice conversation with the back-end monitoring center.
In the use of detailed cases, we can refer to the use of vehicle monitoring system deployed by Hubei Forest Public Security. The whole plan is to build a wireless audio and video transmission system covering the whole area under the jurisdiction of forest public security, based on the demand of Forest Public Security Law of the Forestry Department and relying on the 3G/4G wireless communication network of telecommunication operators. The roof of 100 forest public security patrol vehicles equipped with special pan-tilt cameras can monitor the dynamic information of the legal scene in real time. Together, it can also understand the traffic situation on the road, facilitate the command of forest public security patrol vehicles to choose Xiangjia Road, and complete the long-distance supervision and management of forest public security legal acts. In case of major emergencies, live broadcasting or video file playback can be carried out through 3G/4G network, and voice intercommunication between command center and field personnel can also be carried out through wireless transmission equipment to facilitate emergency command and complete long-distance visual command.
Referential Skills of Wireless Vehicle Monitoring
In the face of customers, although different businesses focus on different characteristics of the main products, many security and non-security skills require different requirements. And after many characteristics of the functions and skills presented, in a period of time, the mall quickly presents the same type of products with the same skills and functions. In distinguishing the wireless vehicle monitoring products and their functions, we need to distinguish from the following key points by referring to skills indicators.
H.265 Coding and Decoding Skills
Compared with H. 264, the new H. 265 coding skills will greatly reduce the size of H. 265 coded video and further improve the experience of wireless image transmission under the same image quality.
1080P Real-time Video Monitoring
The front-end can access 1080P high-definition vehicle video recorder for real-time video monitoring. The wireless vehicle terminal supports real-time video long-distance reading, and can monitor high-definition vehicle video in real-time in the monitoring center.
Video storage and playback
The wireless vehicle terminal has vehicle-mounted hard disk and supports 1080P high-definition storage, which facilitates front-end storage and saves network resources. When recording, it can choose whether to take audio and video recordings. Vehicle-mounted video recordings can be queried and downloaded over long distances. The download speed of video files can be equipped. When supporting disk is abnormal, it can actively correct, and when supporting disk is abnormal, it can report to the police.
When the monitoring point is abnormal, on-board alarm linkage is mainly connected with external alarm equipment, that is, the driver can alarm the monitoring center in case of an emergency while driving, and can make two-way voice calls.
The built-in GPS module can report the vehicle's GPS location information, complete the tracking of the vehicle's track, and fully understand the vehicle's movement. Previous video playback can show the track of the vehicle running together, and also expand the positioning of the bucket pole.
Pictures can be snapped in front of the scene, and then saved on the vehicle hard disk to facilitate later traceability. Capturing can be done by three methods: alarm linkage, mobile detection and switch alarm.
It can be used for input and output of one bidirectional audio codec, and for bidirectional voice intercommunication with back-end monitoring center.
Active sleep, long-distance Awakening
The device can set up active sleep function. When there is no video stream transmission, the device acquiesces that there is no stream transmission within five minutes, and then disconnects the 3G/4G network to save money. If the wake-up device is on line, the front-end sleeping device can be waked up by telephone or short message. Supporting the method of calling and sending SMS messages to SIM card triggers the device to go online, as long as the phone number is added to the whitelist of telephone and SMS in advance, it has the privilege to activate the 3G/4G network connection. The whitelist of telephone and short message supports five more telephone numbers.
Switch Volume Activation Up-line and Down-line
Support switch quantity activates up and down line, and when alarm occurs at parallel port, 3G/4G goes on line.