Ann edit

Vehicle DVR belongs to the market segment of traditional embedded hard disk video recorder. It is a new special product developed with the application of digital video and audio coding technology in vehicles. It adopts embedded processor and embedded operating system, combines the latest h.264 audio and video compression / decompression technology in IT field, GPS global positioning technology, 4G wireless communication technology, USB communication technology, advanced vehicle power management technology, GPS geographic information technology, and is suitable for 24-hour monitoring of various types of vehicles. 

It can carry out audio and video synchronous recording, global positioning, wireless audio and video real-time transmission, and reserve a variety of interfaces on the host. It can be connected with on-board devices such as on-board display screen, IC card on-board machine, signal priority control system, passenger flow statistics system, etc. it can be widely used in public transportation, long-distance passenger transportation, school bus, engineering bus, container bus, tourist bus, logistics and freight transportation Police law enforcement vehicles, trains, subways, ships, planes and other mobile vehicles. At present, the video and audio code algorithms selected by DVR manufacturers mainly include: MPEG-2, MPEG-4, H.264, MJPEG, etc., among which MPEG-2 and MJPEG have low compression ratio and are rarely used; H. 264 coding algorithm has the characteristics of high video compression rate, low bit stream, low wireless network bandwidth and good adaptability, which is the direction of vehicle DVR compression format. With the improvement of digital coding performance, the video resolution of vehicle DVR also increases from CIF (352X288) to D1 (704X576)

DVR adopts digital recording technology, which is far superior to analog monitoring equipment in image processing, image storage, retrieval, backup, network transmission and remote control. DVR represents the development direction of TV monitoring system and is the first choice of TV monitoring system on the market.

The popular products on the market are PC platform DVR and embedded DVR. Embedded DVR has the advantages of "specialization" in stability, reliability and ease of use. Embedded DVR will gradually occupy the PC platform DVR market. PC platform DVR has advantages in generality and expansibility. It can still play the role of managing host in network video monitoring system and still has its own market share.

At present, many foreign companies have invested in the development of multi-channel MPEG-II, MPEG-4 compression chip, and wavelet image compression chip. The emergence and application of new compression chip will make the digital network video monitoring into a new era. At the same time, with the continuous increase of storage capacity, the continuous reduction of price, the development of new storage technology, the continuous improvement of full digital and high-definition camera, high-quality image standard products will be put into the market, and become the new favorite of digital network video monitoring.

DVR is divided into embedded and PC type. PC type, as people know, The biggest advantage of this product is intuitive operation, and it’s easy for people who are used to using computers. The biggest disadvantage is the monitoring system based on Windows system, not to mention whether the monitoring program itself is stable. It’s very difficult to keep Windows running for half a month without crashing. Therefore, PC DVR is suitable for people and departments with certain basic computer skills. Otherwise, if there is a small problem, you have to ask the manufacturer to solve it. Even if the manufacturer’s after-sales personnel are not crazy, you will be crazy yourself. 

Embedded DVR, from the appearance, we can see that this product is very small, but it’s just the appearance. what makes people excited is its interior. It is an embedded monitoring software system developed based on RTOS platform. The program is stored on the read-only ROM, and will never be invaded by virus. It is completely fool like operation. It can record video when it is turned on. Just like the DVD player used at home, it can be operated by remote control, and the embedded functions that can be completed by PC can be basically covered. The stability and operability of PC DVR are the key technical indicators of DVR. The inherent defects of PC DVR determine that embedded DVR will be popular in the future.