With the
rapid development of the intelligent industry in recent years, the rapid
application of security monitoring systems in banks, transportation,
community, public security, and even home, people have become more and more
aware of the importance of security cameras, but in the face of various types
And security cameras with different technical features, how do we choose the
suitable security camera from the aspects of shape, lens, resolution, storage
mode, connection mode, power supply mode, video coding and so
on.
Shape
There are many types of CCTV camera, usually in
the shape of a security bullet camera, dome
cctv camera, PTZ Camera and Panoramic Camera etc., and also in the
shape of a robot camera, plug camera, bulb camera and so
on.
Lens and ZoomThe lens of Cctv camera ,
generally has fixed lens 2.8mm/4mm/6mm/8mm/12mm and varifocal lens and
motorized lens camera. Each product line can choose the lens focal
length to meet the shooting needs of indoor and outdoor environments. such as
4x zoom, 10x zoom, 20x zoom and 30x optional zoom. In general, the shorter
the focal length, the larger the range of angles seen, but the shorter the monitoring
distance.For example, the 2.8mm focal length is suitable for narrow
environments such as elevators and corridors, and more spacious places such
as parking lots, factory workshops, and courtyards should use 6mm lens or
more. Resolution Buy a surveillance camera, Should we choose the suitable
resolution for the camera?We know that the larger the resolution of the
camera and the higher the pixel, the clearer the image will be. Ordinary home
indoor surveillance cameras choose 1MP, 1,3MP and 2MP Full HD camera,
resolution 720P, 960P or 1080P surveillance cameras, which can basically meet
our monitoring needs.If you are using outdoor or large security projects,
such as streets, train stations, plazas, stadiums and other outdoor
large-scale scene monitoring, we recommend using 4mp, 5mp or 8mp 4K ultra hd
camera. However, the higher pixel of the camera , the larger the memory space
is occupied, and under the same conditions, the storage time becomes shorter.
Therefore, when considering the definition, we also have to consider the
problem of storage time. Storage MethodWhen installing a 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, 1.
local storage, 2. SD card storage, 3. cloud storage.Network hard disk
storage: It is suitable for indoor indoor outdoor network monitoring
equipment, which requires long-term video recording. Such as IP Camera,
HD NVR, WIFI NVR Kits, POE CCTV Kits.Local
storage: Power-on plug-in, such as TD memory card, will automatically record,
without any settings and support for network disconnection. However, this is
an automatic loop recording, which automatically overwrites the early
recording after the TF is stored. Suitable for indoor or outdoor smart
cameras such as WiFi PTZ Camera, WIFI Solar CameraCloud storage: Don’t worry
about surveillance cameras, hard disks or TF cards are damaged, 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. At present, many WiFi smart cameras support cloud storage in
addition to local storage. Connection MethodWith the development of the times
technology, from analog cameras to IP network cameras, the networking method
is constantly changing, and IP network monitoring should be the development
direction of future network monitoring.Nowadays, many security cameras are
network surveillance. 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 selected according to actual
conditions, such as with a network cable connection, the network is stable,
but the wiring may be inconvenient; wireless transmission,
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 CCTV cameras on
the market support more than two types of network connections. Power
SupplySecurity monitoring equipment power supply can be divided into three
types: independent power supply, centralized power supply or POE power
supply, but this is for large engineering, each power supply has its
advantages and disadvantages.For example, independent power supply
maintenance is easy, anti-interference is good, but construction is
troublesome. Centralized power supply maintenance is simple, low energy
consumption, but the anti-interference is poor, and the monitoring system is
prone to paralysis. POE power supply, No need external power, but mainly in
the network cable and distance limit, the equipment cost is high. Video
CodingWhat 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. The main role is to compress and process
redundant data, compress file size, reduce bandwidth, and reduce 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.
Compared to traditional H.264, H.265, and even H.265+ video coding methods
are beginning to appear and are beginning to be used in security
surveillance, such as face recognition camera. The video compression
efficiency is improved, and the bandwidth and storage cost are greatly
reduced, which has a positive effect on the popularization of high-definition
network video surveillance.