The choice of surveillance camera, different surveillance camera manufacturers have different suggestions, different purchase methods. Xiaobian thinks that the purchase of surveillance cameras, users only need to pay attention to these points.
1、 Storage mode of surveillance camera
Once the storage of the monitoring system goes wrong, the whole system will lose the basic function of restoring the truth of the video. Nowadays, there are three ways of monitoring storage: video recorder hard disk storage; SD card storage; cloud storage. The plug-in card storage camera does not need to be set, and the plug-in card power can support video recording. The way is circular video recording. When the memory card is full, the earlier video will be covered. Cloud storage is the product of the development of Internet technology. Many home monitoring brands support cloud video, cloud access and playback.
2、 Focus of surveillance camera lens
The lens focal length of the surveillance camera is 2.8 mm, 4 mm, 6 mm, 8 mm and 12 mm. Generally, the smaller the focal length of the lens, the larger the angle range, but the shorter the distance to be monitored. Therefore, the 2.8mm lens is suitable for the small environment such as corridor and elevator, the 4mm lens is suitable for the room, the 6mm lens is suitable for the corridor or unit door, the 8mm lens is suitable for the workshop or corridor, and the 12mm lens is suitable for the long and narrow road.
3、 Surveillance camera resolution
The resolution of the surveillance camera is what we usually call the definition. The larger the resolution, the higher the pixel, the clearer the image. Now the network camera usually uses more than 1 million, 2 million and 4 million pixels, which can basically meet the requirements of normal monitoring. The higher the resolution, the larger the storage space of the surveillance video, and the shorter the storage time. Therefore, when we consider the definition, we also need to consider the storage time of the video.
4、 Surveillance camera motion detection
No matter whether you have an indoor or outdoor surveillance camera, the mobile detection function can add a good guarantee to the security monitoring. When there is an abnormal intrusion, the surveillance camera can give an alarm at the first time, and inform the user to deal with it through SMS or e-mail.