01. The composition of surveillance cameras:
It is mainly composed of 4 large accessories and 3 small accessories.
Large accessories: camera chip, lens, light board, shell.
Small accessories: tail line, lens holder, copper column, etc.
Usually a network camera tail cable interface, the other is the power cord. If it's a POE camera, it's a network cable interface. Why are the prices of different brands of cameras the same as pixels but vary a lot? The main reason is the difference in the quality of materials used in these accessories. People with strong hands-on ability can assemble one by themselves to try the effect.
02. The chip of the camera:
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 directly called the camera motherboard, divided into CCD motherboard and CMOS motherboard. The two important parts of the chip are the imaging sensor and the chip processor.
The knowledge of CCD and CMOS is not expanded here. It is usually enough to know the nouns. Friends with strong thirst for knowledge can look at it on Baidu. It is estimated that I copied it and you skipped it. But the difference between CCD camera and CMOS camera, or to understand:
CMOS fabrication process is simpler than CCD
CMOS is cheaper than CCD
CMOS consumes more power than CCD
CMOS noise is greater than CCD
CMOS sensitivity is worse than CCD
CMOS resolution is lower than CCD
03. The lens of the camera
The lens of the camera is divided into large lens and small lens from the appearance. Just know what it is called, just look at the picture and find out.
The key knowledge of the lens is the focal length and aperture.
Focal length: is what we usually say how many millimeters of lens. Generally, there are 4mm,6mm,8mm,12mm, etc.
Aperture: It is the F value that appears on the lens, generally F1.0,F1.2,F1.4,F1.6.
The larger the number of millimeters of the lens, the smaller the range and the farther the distance. For example, according to the workshop, the warehouse usually uses 4mm lens; According to the residential building unit door is usually 6mm; According to the fence, the path is usually 12mm, of course, I don't think it should be flexibly selected and used according to the specific application.
The smaller the F value of the aperture, the greater the amount of light, and the more expensive the price of the lens.
04. Camera light board
Common camera lamp board: array infrared lamp, ordinary infrared lamp, white light plate.
The function of the light board is to provide an auxiliary light source for the lens at night, so that the lens can sense infrared light and become an image. If the delivery effect of the lamp board is not good for various reasons, it can also be equipped with an auxiliary light source separately.
05. Camera housing
There are various shapes of camera housings, generally gun-type, hemispherical, and spherical. There are aluminum and plastic materials. Specific different manufacturers of different brands are not the same.