With the development of 3G/4G, mobile surveillance has become the mainstream of the current market. Vehicle surveillance, as a part of mobile surveillance, realizes remote video browsing, remote control, geographic location, voice intercom and other functions through 3G/4G network, meets the needs of customers for remote video viewing and remote emergency command, and provides wireless video surveillance services anytime and anywhere to application customers. It can be widely used in judicial business applications.
For the mainstream manufacturers in employment, the general vehicle monitoring system consists of three parts: vehicle terminal, 3G/4G network and monitoring center. The vehicle terminal is the front-end equipment of the wireless vehicle monitoring system, which is generally installed in various vehicles in secret. The vehicle terminal equipment mainly consists of wireless vehicle terminal, tablet computer, high-definition vehicle Yuntai camera, vehicle mounting bracket and equipment box. Equipment composition. When the system is turned on, it can browse the images in real time through the tablet computer, control the rotation of the vehicle-mounted pan-tilt camera, and carry out two-way voice intercommunication with the back-end monitoring center.
For example, Kodak's executive command system for the construction of Guangxi Gaofa involves on-board monitoring of the front-end in-depth law enforcement site, image acquisition and transmission. On December 24, 2014, when the Supreme People's Court's Executive Command System was opened, it completed the on-site connection with Gaofa, Guangxi, and carried out remote executive command in response to a dispute over the right of recourse. The system acquired real-time sound and image on-site through one Kodak soldier wireless video surveillance equipment equipped with executing personnel and three Kodak vehicle wireless video surveillance equipment equipped with police vehicles, so as to let the command center. We have a complete understanding of the process of on-site enforcement of the property of the person who refuses to perform the debt. Among them, the video and audio information supply and two-way communication in the ordinary environment are realized by on-board equipment, while other indoor environments rely on individual equipment.
Secondly, the on-board monitoring system deployed by Kodak for Forest Public Security in Hubei Province is based on the application requirements of forest public security law enforcement of the Forestry Department. It installs a dedicated pan-tilt camera on the roof of 100 forest public security patrol vehicles, which can monitor the dynamic information of law enforcement scene in real time, and understand the road traffic conditions, so as to facilitate the command of forest public security patrol vehicles to choose the best route. 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 be carried out through wireless transmission equipment to facilitate emergency command.
Relying on the 3G/4G wireless communication network of telecom operators, a wireless audio and video transmission system covering the whole area under the jurisdiction of forest public security is built. The command center can receive real-time audio and video images of law enforcement scene, supervise and manage forest public security law enforcement behavior remotely, and realize remote visual command through voice intercommunication between vehicle-mounted wireless video terminal and front-end law enforcement personnel.
The framework of Forest Public Security Wireless high-definition vehicle monitoring system consists of front-end, transmission network and back-end video scheduling platform. The system provides 100 forest police patrol vehicles with real-time wireless transmission of video images, rapid response to accidents, call command, geographical location and other functions to solve the problem of dynamic command and management of law enforcement scene.
Wireless high-definition vehicle monitoring front-end vehicle installed wireless vehicle image transmission equipment, external high-definition vehicle infrared platform camera, wireless vehicle image transmission equipment digital audio and video signal through 3G/4G wireless network transmission to the back-end video scheduling platform centralized management, monitoring management center can real-time monitor and control the image returned by the front-end vehicle. The system supports dual-stream technology. The local video of the front-end vehicle terminal adopts 720P resolution. The resolution of CIF/D1/720P can be selected for different networks for remote network transmission, thus realizing local high-definition coding storage and remote high-definition browsing.
In recent years, Kodak has accumulated and innovated in vehicle monitoring, and its products and performance have gradually become the mainstream of the industry:
Compared with H. 264, the video size encoded by H. 265 will be greatly reduced under the same image quality. Further enhance the wireless image transmission experience.
1080P Real-time Video Monitoring
The front-end can access 1080P high-definition vehicle-mounted pan-tilt camera for real-time video surveillance. The wireless vehicle terminal supports real-time video remote browsing, and can monitor high-definition vehicle video remotely and real-time in the surveillance center.
Video storage and playback
The wireless vehicle terminal has a hard disk in the vehicle, supports the highest 1080P HD storage, facilitates front-end storage and saves network resources. When recording, it can choose whether to take audio and video recordings. Vehicle video recordings can be queried and downloaded remotely. The download speed of video files can be configurable. It supports automatic repair when disk is abnormal, and reports to police when disk is abnormal.
When the monitoring point is abnormal, the vehicle 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, track the vehicle's trajectory, and fully understand the vehicle's movement. History video playback can show the track of the vehicle at the same time. Beidou positioning can also be extended.
It can capture the scene image in front of it and save it on the hard disk of the vehicle, so as to facilitate the traceability afterwards. Capturing can be done by three ways: alarm linkage, mobile detection and on-off alarm.
It can provide one bidirectional audio codec input and output, and can communicate with the back-end Monitoring Center for bidirectional voice.
Automatic Sleep and Remote Wake-up
The device can set up automatic sleep function. When there is no video stream transmission, the device defaults to no stream transmission within five minutes, 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. Supports triggering device on-line by calling and sending SMS messages to SIM card. Only telephone numbers pre-added to the whitelist of telephone and SMS can have the privilege of activating 3G/4G network connection. The Whitelist of Telephone and SMS supports up to five phone numbers.
Switch Volume Activation Up-line and Down-line
When the switch quantity is activated and the alarm is generated at the parallel port, 3G/4G will be on line, and after the alarm is restored, 3G/4G will be off line, which can save the cost.
Because the instantaneous voltage is too high to damage the equipment when the vehicle starts, it can be avoided by delayed start-up function. In order to avoid the influence of the power off of the vehicle on the equipment, the automatic delay shutdown function can be adopted, and the delay time can be set.
Wide-band voltage input
In order to supply power to the equipment on the vehicle, the equipment supports 6-36V wide-band voltage input and covers the mainstream 12V and 24V power supply vehicles.
Shock absorption design
In order to ensure the normal and stable operation of the equipment, the audio-video input-output interface and power interface of the equipment are designed with aviation plugs to ensure that the interface is firm and not loose. The built-in wire rope shock absorber and hard disk are placed on the shock absorber, which can effectively resist lateral and longitudinal bumps. To ensure the reliable operation of hard disk and the integrity of video data.
Bit Stream Bandwidth Adaptive Technology
Due to the characteristics of signal transmission in the 3G/4G network itself, narrow bandwidth, easy interference, instability and other factors will lead to fluctuations in wireless bandwidth. For this reason, Kodak has launched a self-developed KWTP wireless transmission protocol, which guarantees the reliability of the transmission of bit streams. It can automatically adjust according to the current network conditions and improves the stability and efficiency of video and audio transmission.
KWDS Technology Enhances Transmission Reliability
Through KWDS technology of Kodak's independent intellectual property rights, the device can dynamically adjust the data transmission strategy according to the current 3G/4G network communication quality to ensure the fluency and clarity of video signal transmission in the wireless network.