High-definition surveillance cameras are mainly used in financial systems, municipal institutions, road traffic monitoring and other places with high image requirements. These places require a clear look at facial features, behavior, license plate numbers, etc. So if the project you undertake is these applications, you can consider whether to choose high-definition surveillance cameras from the cost.
2. Product characteristics
Cameras higher than 600 lines are usually positioned as high-definition surveillance cameras in the market. In fact, some unscrupulous manufacturers in the market sell 500-line chips as 600-line products, mainly because video digital processing chips are different. This is very different from the real 600-line CCD chip contrast imaging effect, so try to choose manufacturers with good reputation, such as Lode and Dahua.
3. Function
High-definition surveillance cameras are mainly reflected in the clarity of the picture. To achieve the clarity of the picture, not only the horizontal resolution of 600TVL, but also the functions of wide dynamic, automatic white balance, image clarity adjustment, super digital noise reduction, intelligent digital automatic photometric compensation and so on. When testing the wide dynamic function, it is necessary to observe whether the transition between bright area and dark area is clear and natural, and whether the wide dynamic range can be adjusted automatically. A good camera will have rich levels and delicate performance in both bright and dark areas. When you look at the license plate under the headlights at night, the outline, filament and license plate of the headlights are very clear, and there is no vertical bright line. In low illumination, it is necessary to observe whether the monitoring picture of the camera is clear and whether the noise is loud at night.
4, easy to control
The operation settings of HD surveillance cameras are mainly adjusted through electronic menus and dial numbers. Camera with electronic menu function needs to pay attention to whether the menu content is rich, whether the operation is convenient and whether it can meet different complex monitoring environments. Moreover, Chinese menu function is more intuitive and easy to use than English menu debugging. Some camera menus include standard day, day and night, party, road and user-defined modes. You only need to choose a mode, you can easily cope with all kinds of complex environmental needs, and this function is faster and more convenient.
5. Data interface
In practical application, due to environmental or man-made damage, the surveillance camera may not work normally. Therefore, when buying high-definition surveillance cameras, we should also pay attention to whether the back-end data interfaces are rich. Generally, we need alarm interfaces, audio interfaces and RS-485 interfaces. Some interfaces can improve the security level of monitoring, and some interfaces can facilitate remote menu calling and setting, thus improving the convenience of monitoring equipment maintenance in the later stage.
6, wide voltage function
In practical application, we often encounter the phenomenon that the power supply is unstable and the camera burns out. Especially in some remote mountainous areas, the voltage is high and low, which easily leads to the failure of surveillance cameras. The power supply of the camera is mostly DC24V and AC 12V. However, some manufacturers have cameras with wide voltage function. For example, the standard voltage is AC 12V, but the camera can work normally between 9 16V. At this time, the benefits of wide voltage function are obvious.
7. Lightning protection function
With the rapid popularization and application of security monitoring system in banks, transportation, residential quarters and warehouse management, the possibility of monitoring system equipment being damaged by lightning is greatly increased. Up to 85% of surveillance cameras are damaged by lightning in thunderstorm weather, which may lead to the failure of the whole monitoring system, and the price of high-definition cameras is also very high, which directly causes immeasurable economic losses. Youshi camera with lightning protection patent in the market is mature, so it is very important to choose a camera with chip-level lightning protection function.
8. Other systems
In order to obtain high-definition images, in addition to the front-end high-definition surveillance camera, the transmission system, intermediate system and terminal display system must meet the requirements of bandwidth and compression, so as to achieve the practical effect of high-definition. This includes cables, matrices, video recorders, servers and various encoders. The optical cable has the advantages of large bandwidth, small attenuation and strong anti-interference, which can better ensure the quality stability in the process of image transmission. It is best to choose progressive scanning display for terminal display equipment, with more than 600 lines. Therefore, in addition to the early monitoring equipment, other supporting facilities are also important indicators to measure the monitoring quality.
9. Technical services
Finally, before buying the product, don't forget to know the technical support of the manufacturer, whether it can provide professional technical training for the product, and analyze and explain the special functions and operation menu of the product in detail, which are very important for the later construction and maintenance. In addition, if the product can't work normally, it is also important that the manufacturer can provide various corresponding technical services.