1, when the camera's chip CCD or CMOS? At present surveillance cameras use CCD chips in most cases;
2, the size of the CCD chip: Currently on the market are 1 inch, 2/3 inch, 1/2 inch, 1/3 inch, 1/4 inch, 1/3 inch and 1/4 inch CCD chip majority, Larger chip image quality is better, the price is more expensive;
3, CCD camera pixels: the larger the pixel, the image clearer;
4, CCD horizontal resolution: resolution is the TV line (referred to as line tv lines) to represent. The typical color camera resolution is between 320 and 500 TV lines, there are 330 lines, 380 lines, 420 lines, 460 lines, 500 lines and other different grades;
5, the lens: According to the object distance, the size of the image to calculate the lens focal length, select the appropriate focal length lens such as standard lens, long focal length lens, short focal length lens, also need to consider the lens imaging size should be consistent with the camera CCD target surface size, There are lens resolution, aperture and other factors;
6, the minimum illumination: also known as the sensitivity of the CCD is sensitive to ambient light, or CCD is the most common imaging of the darkest light. The unit of illumination is LUX, the smaller the value, the smaller the required light and the more sensitive the camera. Moonlight and star-level high sensitivity cameras can work in very dark conditions, 1 ~ 3lux is a general illumination.
Moonlight type: normal work required illumination 0.1lux or so;
Star type: normal work required illumination below 0.01lux;
Infrared type: Infrared lamp lighting, in the absence of light can also be imaging (black and white);
7, signal to noise ratio: a typical value of 48db. If 50db, the image has a small amount of noise, but the image quality is good; if 60db, the image quality is good, no noise;
8, other factors: such as automatic gain and white balance.
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