早在二十世纪八十年代初，人们便有了车载监控的意识，开始在车里安装录像设备，后来随着科学技术的发展，便出现了模拟车载录像机，这种录像机通过模拟信号的方式来记录并保存车辆的运营情况，使得计算机无法对其进行参数设置、管理及查询，而且碍于录像带的图像记录时间有限，在车辆运行过程还要不断更换录像带，这为存储带来了不可避免的麻烦……于是，车载DVR便应运而生。
所谓车载DVR，即采用1U的标准架构，安装于公交车辆的收音机或者CD播放机的位置，接入1-4路图像，来对车辆中的情况进行监控并录像，目前车载DVR采用的压缩算法主要为MPEG4与H.264。
厂商们为这种应用于车内的嵌入式DVR起了个好听的名字，MDR或者MVR(Mobiledigitalrecorder或Mobilevideorecorder)。于是，“Mobile(移动性)”成为了车载DVR与普通DVR最大的区别。正是由于车载DVR具备这种移动性，便为车辆在移动过程中的安全监控提供了良好的条件。
是不是普通的监控DVR都能用于车载?答案是否定的。虽然与普通DVR一样采用嵌入式系统，但车载DVR技术比普通DVR更为复杂，需求解决的关键也不同。因为车辆在移动过程中，免不了会遭到震动、灰尘、供电量大等问题，这些都注定了车载DVR的应用环境比普通DVR的更为恶劣。
车内环境恶劣，多技术融合“稳”操胜券
据了解，为了保证公交车在运行中仍能实现流畅地存储，厂家们对车载DVR的加强技术主要包括防震、稳压电流、散热性、无线传输等。这些技术的完美融合，都是为了进一步提高车载DVR存储的稳定性。
In the early 1980 s, people have the consciousness of the on-board monitoring, began to install video equipment in the car, then with the development of science and technology, there is a simulation of car video recorder, the video recorder to record by means of analog signals and maintain the vehicle's operation, make the computer can not be on the parameter setting, management and query, and because of the video image recording time is limited, during vehicle operation will constantly change video for storing the inevitable trouble... Therefore, DVR is born.
So-called car DVR, that is, using 1 u standard architecture, installed on the bus the location of the radio or CD player, 1-4 road image, access to the vehicle in the case of monitor and video, the compression algorithm is mainly for the car DVR MPEG4 and h. 264.
Manufacturers have come up with a catchy name for the built-in DVRS that are used in cars, MDR or MVR(Mobiledigitalrecorder or Mobilevideorecorder). Thus, "Mobile" has become the biggest difference between an on-board DVR and an ordinary DVR. It is because the DVR has such mobility that it provides a good condition for the security monitoring of the vehicle in the process of moving.
Is it common to monitor DVR can be used on the car? The answer is no. Although embedded system is adopted in the same way as the ordinary DVR, the on-board DVR technology is more complex than the ordinary DVR, and the key to solve the demand is different. Due to the problems of vibration, dust and large power supply, the application environment of DVR is worse than that of DVR.
In the car environment is bad, multi - technology integration "stability" ticket
It is understood that in order to ensure the smooth storage of buses in operation, manufacturers strengthen DVRS on board vehicles mainly including anti-vibration, stable voltage current, heat dissipation and wireless transmission. The perfect integration of these technologies is aimed at further improving the stability of DVR storage.
减震
由于车况、路况的不同，防震技术便成为了对车载DVR最基本的要求，其中包括对整机减震、硬盘架减震、硬盘减震等多个环节，来达到对整个车载DVR的减震处理。
在这些减震环节中，硬盘的减震则是重中之重。这是由于车载DVR中最容易损坏的部件便是硬盘，如果硬盘一旦遭到损坏，便无法将车内情况进行存储，因此硬盘的减震问题显得尤为重要。
对于目前减震的方法目前市场上大多采用弹簧、橡胶垫作为防震材料的结构，虽然在垂直受力方向上能起到一定的作用，但实际上在行车状态下(特别是在恶劣的路况条件下)其震动方向是不规则的，长时间使用必然会导致设备发生故障。弹簧跟橡胶垫其实并不能吸收震动的能量，反而会将这种能量进行存储，当达到一定程度后，会造成更大的反弹。据他介绍，目前有一种橡胶垫内加油囊的作法，主要是利用油的压缩比空气小的优势，以达到更好的减震效果。
此外，还有一些厂家也有针对车载DVR进行硬盘悬挂避震或机箱悬挂避震的设计，是将硬盘或整个机箱达到“悬空“状态，以达到减震效果。
稳压电源
除了减震，车载DVR中的另一个重要技术便是电源的稳定。由于车辆在行驶过程中，车辆会有刹车、爬坡、点火等动作，这种行为都会使车辆的输出电压产生不同幅度的波动，很容易造成烧坏车载设备的现象，因此车载DVR本身必须具有宽电压输入能力来适应这种电压变化。
Shock absorption
Because of the different cars, road conditions, anti-shock technology has became the most basic requirements for car DVR, including the whole damping, hard disk, hard disk, reduce vibration, and other links, to achieve for the whole car DVR shock treatment.
In these damping links, hard disk damping is the most important. This is because the most easily damaged parts in car DVR is hard disk, if the hard disk once damaged, can't will the car condition for storage, so the hard disk shock problem is particularly important.
For the current method of damping on the market at present is mostly use spring, rubber mat as shockproof material structure, although can play a role in the vertical stress direction, but in fact in driving conditions (especially under the condition of poor road conditions) the direction of vibration is irregular, the long time use will inevitably lead to equipment failure. Springs and rubber pads do not actually absorb the energy of vibrations, but store it, and when they do reach a certain point, they cause a greater bounce. According to him, at present there is a kind of rubber gasket inside refueling bag method, basically is to use the advantage of oil compression than air, in order to achieve better shock absorption effect.
In addition, there are some manufacturers have for car DVR hard disk suspension shock absorber or chassis suspension shock absorber design, is the hard disk or an entire chassis to "hung up" state, in order to achieve damping effect.
Regulated power supply
Besides damping, another important technology in DVR is power stability. Because of the vehicles in the process of driving, there will be a brake, climbing, ignition, this kind of behavior will make the output voltage of the vehicle produces different amplitude fluctuations, it is easy to cause burn out the phenomenon of on-board equipment, so the car DVR itself must have wide voltage input ability to adapt to this change.
散热性
据了解，公交车在运行过程中，会存在温差变化较大的特点，很多公交车都是将车载DVR安装在司机座椅下或者驾驶座顶部封闭的空间内，这就对车载DVR的使用性能提出了更高的要求。
不过，有业内人士认为，由于国家和地方政府对GPS定位系统有具体的要求和相关文件，很多运输公司都强制性装备了GPS定位系统，所以车载DVR所加入的GPS功能，是比较符合公交车需要的。
未来：让存储更智能
从以上介绍看来，车载DVR仿佛已经比较完善了。然而，只有不断创新，才能使车载DVR市场发展得更快。从采访中笔者了解到，目前厂家们已开始考虑对车载DVR某些功能进行智能化处理，比如说增加人脸识别、人数统计、特征识别等功能，增加车载系统的的实用性和针对性，让存储更智能化。
Radiation capability
Is reported that a bus in the running process, will have the features of temperature difference is bigger, a lot of buses are install the car DVR under the driver's seat or in the driver's seat at the top of an enclosed space, it is the use of car DVR performance put forward higher requirements.
There is, however, the personage inside course of study thinks, because of the state and local governments have specific request for the GPS positioning system and related documents, many shipping companies are mandatory equipped with GPS positioning system, so the car DVR, GPS, affiliation is met the need of the bus.
Future: make storage smarter
From the above introduction, vehicle DVR seems to have been relatively perfect. However, only through continuous innovation can the on-board DVR market develop faster. From the interview, the author understands, the producers have begun to consider to intelligent processing of car DVR certain functions, such as increasing the size of the face recognition, statistical, identification, and other functions, increase the practicability and pertinence of on-board system, make the store more intelligent.
当车上发生违法事件后，警方只能通过认真观察做案者的面貌、穿着等，当做案者再次出现时，才能根据判断将其抓获，这样的做法非常浪费时间，也不够灵活。而且，管理中心人员在每次观看录像回放或实时的视频流时，都难免会有错过某些事件的情况。所以，为车载DVR植入“神经系统“，让它代替人脑来进行分析、判断，将会是未来的发展方向。
对于加入智能分析技术的优点，智能分析技术借助计算机强大的数据处理功能，对视频画面中的海量数据进行高速分析，过滤掉用户不关心的信息，仅仅为监控者提供有用的关键信息，从而能有效地节省了带宽，极大地提高了可用网络带宽。
更重要的，是智能视频技术可以通过分析实时的或记录的视频流，从而检测出可疑的活动、事件或者行为模式，可以使视频监控从事后搜寻犯罪嫌疑人转换为一种事发当时阻止犯罪发生的辅助手段。
智能化在未来车载DVR的存储应用中将起到越来越重要的作用，厂家们也会继续根据用户的需求，研发更多的创新技术，以保障记录数据的完整性与可用性。
When the car after the illegal incidents, the police only through careful observation to do the face of the case, wear, etc., as the case again, can according to the judgment will be captured, so it is very waste of time, is not flexible enough. Moreover, the management center staff will inevitably miss certain events every time they watch video playback or live video streaming. Therefore, it will be the future development direction to implant the "nervous system" into the vehicle DVR and replace the human brain for analysis and judgment.
To join in intelligence analysis technology, the advantages of intelligent analysis technology with the aid of computer powerful data processing function, high speed analysis was carried out on the huge amounts of data in video image, to filter out the user information you don't care about, only the key to provide useful information for monitoring, which can effectively save the bandwidth, greatly improve the available network bandwidth.
More important, it is intelligent video technology can be based on the analysis of real-time or record video streaming, able to detect suspicious activity, event or behavior patterns, can make the video monitoring is engaged in the search for the suspect after converted into a means for the time to stop crime happened.
Intelligent car DVR storage application in the future will play a more and more important role, the manufacturer will also continue to according to the needs of users, more innovative technology research and development, in order to ensure the data integrity, and availability.
