Fully understand the composition of a surveillance camera

01. Composition of monitoring camera:

It mainly consists of 4 large parts and 3 small parts.

Big accessories: camera chip, lens, lamp board, shell.

Small accessories: tail line, lens base, copper pillar, etc.

Usually, the tail line of a webcam is a network cable interface and the other is a power cable. If it's a Poe camera, it's a cable interface. Why the price of different brands of cameras is the same as that of pixels, but there are many differences, mainly due to the difference in the quality of materials used for these accessories. People with strong hands-on ability can assemble a camera by themselves to try the effect.

02. Camera chip:

The most important part of the surveillance camera is the chip, which is equivalent to the brain of the camera. The chip is embedded in the motherboard, so sometimes it is called camera motherboard directly, including CCD motherboard and CMOS motherboard. Two important parts of the chip are imaging sensor and chip processor.

As for the knowledge of CCD and CMOS, it's not necessary to expand here. It's usually OK to know the noun. For those who have a strong desire for knowledge, Baidu can have a look. It's estimated that I'll copy it, and you can also skip this paragraph. But the difference between CCD camera and CMOS camera needs to be understood:

CMOS technology is simpler than CCD

CMOS is cheaper than CCD

CMOS consumes more power than CCD

CMOS noise larger than CCD

CMOS sensitivity is worse than CCD

CMOS resolution is lower than CCD

03. Camera lens

The camera lens is divided into large lens and small lens from the appearance.

The focus of lens knowledge is focus and aperture.

Focal length: it's how many millimeter lens we usually say. Generally, there are 4mm, 6mm, 8mm, 12mm, etc.

Aperture: the F value on the lens, generally f1.0, f1.2, f1.4, f1.6.

The larger the millimeter number of the lens, the smaller the viewing range and the farther the distance. For example, if you want to take a picture of the workshop, the warehouse usually uses a 4mm lens; if you want to take a picture of the unit door of a residential building, you usually use 6mm lens; if you want to take a picture of a fence, you usually use 12mm lens for a path. Of course, you don't think that you should choose and use it flexibly according to the specific application.

The smaller the F value of the aperture is, the greater the flux is and the more expensive the lens is.

04. Camera light panel

Common camera lamp board includes array infrared lamp, common infrared lamp and white light lamp board.

The function of the lamp panel is to provide auxiliary light source for the lens at night, so that the lens can sense the infrared light to become an image. If the delivery effect of light panel is not good for various reasons, auxiliary light source can also be equipped separately.

05. Camera shell

There are various shapes of the camera shell, mainly gun type, hemispherical and spherical. It's made of aluminum and plastic.