Technical Analysis of USB Cameras

2020-03-11

From the composition of the USB camera to determine the quality of the camera, from the hardware mainly: 1. Lens: The lens is composed of a lens structure, composed of a number of lenses, generally plastic lenses or glass lenses. The lens head structure commonly used for USB cameras is: 1P, 2P, 1G1P2G2P, 4G, etc. The more lenses, the higher the cost; Glass lenses are more expensive than plastics, so a good quality camera should be a glass head, and the imaging effect will be better than plastic lenses. At present, most of the camera products on the market generally use plastic lenses or semi-plastic and semi-glass lenses in order to reduce costs.

Image sensors: can be divided into two categories, charge-coupled devices CMOS complementary metal oxide semiconductor CCDs have the advantages of high sensitivity, low noise, and large signal-to-noise ratio. But the production process is complex, the cost is high, and the power consumption is high. It has the advantages of high integration, low power consumption and low cost. But the noise is large, the sensitivity is low, and the light source is high. CCD imaging under the same pixel often ensures basic accuracy in terms of transparency, brightness, color reproduction, exposure, etc. CMOS products tend to have average permeability, less ability to restore color to objects, and less exposure. Therefore, we should pay more attention to the use of cameras, especially CMOS chip products: first of all, do not use it against the light environment, especially do not point directly at the sun, otherwise the tragedy of "magnifying glass burning ants" will happen to your camera.

Secondly, the ambient light should not be too weak, otherwise it will directly affect the image quality. There are two ways to overcome this difficulty, is to enhance the surrounding brightness, and the second is to choose the minimum illuminance requirements of small products, and now some cameras must require 5LUX. Finally, it is important to note that the zoom lens should be used wisely, and this should not be underestimated, with proper adjustment, the USB camera can also make the imaging chip functional.

USB camera