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How to choose a video surveillance camera
In the wireless monitoring system, the video surveillance camera is an indispensable device, so how to choose the appropriate video surveillance camera for the monitoring device? The following is an analysis of how to select a surveillance camera that matches the monitoring system from the aspects of shape, lens focal length, resolution, storage mode, networking mode, power supply mode, and video coding.
1, shape
The shape of the monitoring is various, and the common conventional shapes are a gun shape, a long cylinder shape, a spherical shape, a hemispherical shape, and the like; and also have shapes such as a robot, a plug, and an electric bulb.
2, lens focal length
The home type camera lens has a general choice of 2.8mm/4mm/6mm/8mm/12mm. Each product line can choose the lens focal length to meet the shooting needs of indoor and outdoor environments.
For those unfamiliar with monitoring, it is a bit difficult to choose the appropriate lens focal length. Therefore, the technician will be consulted before the purchase which focal length is right for you. In general, the shorter the focal length, the larger the range of angles seen, but the shorter the monitoring distance.
For example, 2.8mm focal length is suitable for elevators, corridors and other relatively small environments, and parking spaces, factory workshops, courtyards and other more open areas can choose more than 6mm lens.
Resolution
Buying monitoring, of course, the clearer the better, but the clarity of the lens is based on what to choose?
Those who know will know that the larger the resolution of the camera and the higher the pixel, the clearer the image will be. Ordinary home surveillance cameras choose 1 million, 1.3 million or 2 million HD pixels, resolution 720P, 960P or 1080P surveillance cameras, basically meet the needs of use.
However, the higher the pixel, the larger the memory space it occupies, and under the same conditions, the storage time becomes shorter. Therefore, when considering clarity, we also need to consider the storage time problem.
4, storage method
When installing a home-type camera, people are generally worried about the problem of video storage. After all, the stored video is gone, and it loses the role of the camera to restore the truth. There are three ways to monitor storage, one is network hard disk storage, one is local storage, ie SD card storage, and there is cloud storage.
Network hard disk storage: It is suitable for household intelligent monitoring equipment and requires long-time video recording.
Local storage advantages: Power-on card will automatically record, no need to set up and support off-network recording. However, this is an automatic loop recording, which automatically overwrites the early recording after the TF is stored.
Cloud storage: not afraid of monitoring equipment or hard disk, TF damage, you can access cloud video data at any time. With the development of the Internet, cloud storage is undoubtedly the mainstream direction of future storage methods.
5, the connection method
With the development of the times technology, from analog monitoring, digital-analog combination to IP network monitoring, the networking mode is constantly changing, and IP network monitoring should be the development direction of future network monitoring.
Today's smart home monitoring is a type of network monitoring. The network connection methods of these cameras are also divided into three types: 1 network cable connection; 2 wireless connection; 3 AP hotspot connection; all three methods have their own advantages and disadvantages, which can be based on actual conditions. Choice, such as the use of network cable connection, the network is stable, but the wiring may be inconvenient.
For example, wireless connection, installation is convenient, but the wifi network is prone to instability; AP hotspots need to be used in the LAN, there are distance restrictions. However, considering the user's needs and experience, many models on the market support more than 2 connections.
6, power supply mode
There are three types of monitoring power supply modes: independent power supply, centralized power supply, and POE power supply. However, this is for large engineering projects, each with its own advantages and disadvantages.
For example, independent power supply maintenance is easy and anti-interference is good. But the construction is troublesome. Centralized power supply maintenance short answer, low energy consumption, but poor anti-interference, monitoring system is prone to paralysis. POE power supply, no power supply, the key is in the network cable and distance, the equipment cost is high.
7, video coding
What is video coding? The video encoding method refers to a method of converting a video format file into another video format file by using a specific compression technique. 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.
With the rapid development of technologies such as ultra-high definition technology and cloud storage, new requirements and new challenges are put forward for the transmission and storage of massive video data. H.265, and even H.265+ began to appear, improving video compression efficiency and greatly reducing bandwidth and storage costs, which has a positive effect on the popularity of high-definition network video surveillance.