Monitoring systems have become very popular in the industrial, commercial, and civilian fields. Already every one of us has access to surveillance cameras. Every day we go to work, regardless of corridors, elevators, parking lots, company doors, corridors, etc. Go to the camera. So how do we choose a suitable monitoring device?
We will learn the basics of surveillance cameras from the aspects of monitoring composition, monitoring shape, monitoring lens, monitoring resolution, power supply mode, storage mode, monitoring network and video coding to help us better choose monitoring equipment.
Surveillance camera composition:
We need to have a general understanding of the composition of the surveillance camera system. You need to install at least one part of the monitoring system, including the front camera, transmission cable and equipment, and the DVR. ,monitor. This component is the simplest device system. The transmission cable is now transmitted by the network cable. The number of routers or switches used in the transmission device needs to be configured according to the specific conditions.
Surveillance camera shape:
We have seen a wide variety of surveillance cameras, the most common are guns, domes, dome cameras; other shapes are smart machines, toys, plugs, light bulbs and other shapes.
A variety of different shapes, the role is basically the same, the specific role is related to the camera chip and lens parameters, such as outdoor installation of the gun, indoor installation ceiling for the good use of the dome camera, toy shape in order to care for the baby, plug The shape is for concealed installation and so on.
Surveillance camera lens:
The focal length of the lens of the surveillance camera is 2.8 mm, 4 mm, 6 mm, 8 mm, and 12 mm. The lens of the surveillance camera can be selected according to the monitored object. Generally, the smaller the focal length of the lens, the larger the range of angles seen, but the shorter the distance monitored.
So the 2.8mm lens is suitable for the narrow environment of the corridor and elevator, 4mm for the room, 6mm for the corridor or unit door, 8mm for the workshop or corridor, and 12mm for the narrow road.
Surveillance camera resolution:
The resolution of the surveillance camera is the resolution we usually say. The higher the resolution, the higher the pixel, the clearer the image. Now the network camera is usually used by 1 million, 2 million, 4 million pixels, which can basically meet the normal conditions. Monitor usage requirements.
The higher the resolution, the larger the surveillance recording storage space, and the shorter the storage time, so we need to consider the recording storage time when considering the definition.
Monitoring camera power supply mode:
Normally divided into independent power supply, centralized power supply, and POE power supply. Independent power supply advantages Construction and maintenance lines are clear and easy to maintain, but at a high cost. Centralized power supply, monitoring system If the power supply has problems, the whole system is easy to smash, but construction and maintenance are simple. Powered by POE, use POE-capable cameras and switches, free of power, and use the network cable directly.
Surveillance camera storage mode:
Once the storage system of the monitoring system has a problem, the entire system loses the basic function of restoring the video. Today's monitoring storage methods usually include three types: recorder hard disk storage; SD card storage; cloud storage.
The card storage camera does not need to be set up, and the video can be supported by plugging in the cartoon. The mode is loop recording. When the memory card is full, it will overwrite the earlier video. Cloud storage is the product of the development of Internet technology. Many home monitoring brands support cloud recording, cloud access and playback.
Surveillance camera networking method:
The network monitoring camera networking methods include: network cable connection; WiFi connection; AP hotspot connection, each mode has different application environments, and also has their own advantages and disadvantages, but it is recommended to use the network cable connection to be stable and reliable.
Surveillance camera video coding:
The so-called video encoding method refers to the way to convert a video format file into another video format file through a specific compression technology. Why is the video encoded? The complexity is not to say, simply for compression - dealing with redundant data, compressing file size, reducing bandwidth, and reducing storage space.
In order to improve video compression efficiency and greatly reduce bandwidth and storage costs, H.265 and H.265+ coding methods have emerged. The H.265 encoded video stream size is approximately 40% smaller than H.264. However, in the current security industry, the mainstream is still the H.264 video encoding method. After all, the cost performance of the ordinary home camera is relatively high.
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