Demand Analysis of Electronic Monitoring of Passenger Vehicles
1. Video and audio recording requirements
Cameras and pickups are installed at important locations of the vehicle, and video and audio data are recorded and saved by the on-board hard disk recorder for later search.
2.GPS scheduling management requirements
The GPS (Global Positioning System) receiver can acquire the location information such as the location information and speed of the vehicle, and upload it to the dispatch center through the wireless network. The dispatch center converts the coordinate information into a specific location on the electronic map, and performs scheduling management.
3. Wireless network transmission requirements
The main modes suitable for video transmission in the existing wireless network are CDMA/EDGE, etc. The measured network bandwidth is about 50-70 kbps, and the video transmission of C-8 format 4-8 frames is generally realized. The wireless transmission video with such a low number of frames is mainly It is used for emergency command; in addition, the interactive function of GPS satellite positioning information uploading and short message release of passenger vehicles can be realized through the wireless network.
4. Driving record requirements
The main purpose of electronic monitoring of passenger vehicles is to ensure normal driving. If the information record of the vehicle can be combined with the recorded data, it can provide important data for vehicle failure or post-mortem analysis. The driving record information can be obtained by accessing the sensor or the vehicle bus, etc., and can obtain information such as speed, acceleration, braking, turning, engine speed, etc., and then analyze driving parameters such as fuel consumption.
Development of Electronic Monitoring Technology for Passenger Vehicles
1. Electronic vehicle monitoring technology for passenger vehicles based on 3G network
Compared with the traditional 2G network, the 3G network has a higher transmission rate. The uplink bandwidth can meet the requirements of real-time transmission (25 frames/second) of CIF (352×288) format video, while only the transmission frame can be transmitted under 2G network. A very low number of videos.
The technical indicators such as image quality, image coherence and network delay of wireless video transmission based on 3G network are greatly improved compared with 2G networks, and it is the main development direction of electronic monitoring of passenger vehicles in the future.
2.FLASH flash technology
Passenger vehicles run in a vibrating, bumpy environment for a long time, which can easily cause damage to the hard disk. Although various in-vehicle DVR manufacturers adopt shock absorption schemes including active damping and passive damping, it is still impossible to prevent the mechanical hard disk from being affected by the external environment.
At present, the storage medium that is less affected by the external environment and the data is safe and reliable is FLASH flash memory. With the gradual price reduction of FLASH flash memory in these years, FLASH flash memory has been selected by high-end automotive electronic surveillance systems. In the future, FLASH flash memory capacity will increase, and the price will become the first choice for passenger vehicle electronic monitoring. The FLASH flash memory is used to store data. In addition to extending its service life, it also has the advantages of low power consumption, low heat generation and no noise.
FLASH flash memory is mainly divided into two types: SLC (Single Layer Cell) and MLC (Multi-Level Cell). The technical characteristics of SLC are high cost, small capacity, fast speed, and many reading and writing times. The technical characteristics of SLC are large capacity and low cost, but the reading and writing speed is slow. SLC flash memory generally has a service life of about 1 million times, and MLC flash memory has a service life of 100,000 times. The balanced storage algorithm technology can realize long-term and large data volume data security storage.
3. Video intelligent analysis technology
The application of video intelligent analysis technology in passenger vehicles mainly has the following aspects:
(1) Video traffic statistics analysis technology
Passenger transport operators have an urgent need for vehicle passenger flow statistics. With the specific data of vehicle passenger flow, it is possible to rationally arrange the train times and realize intelligent dispatch management; for passenger transport enterprises, it can reduce operating costs and improve vehicle use efficiency.
The traditional passenger flow statistics schemes are mostly based on infrared counters, and the statistical errors are large. They are only used for cumulative records and cannot be uploaded to the dispatch center in real time. Video-based passenger flow statistics technology is accurate and can be combined with wireless transmission technology to report passenger flow data to the center in real time, facilitating remote dispatch management of vehicles.
(2) Video detection and recognition technology
At present, the video intelligent analysis technology on passenger vehicles is mainly the detection of legacy items, identifying the parcels discarded by suspicious persons in the vehicle, and issuing an early warning to the driver.
It is believed that with the improvement of video intelligent processing capabilities, more and more intelligent analysis technologies will enter the passenger vehicle electronic monitoring industry.
Eyeshadow Lying Silkworm Pen,High Quality Lying Silkworm Pen,Makeup Eyeshadow Pencil,Color Eye Shadow
Guangzhou Bijiang Cosmetics Co., Ltd. , https://www.bijiangcosmetics.com