Imaging principle of CMOS camera

CMOS photoelectric sensor directly generates current (or voltage) signal after photoelectric conversion, and the signal reading is very simple.

CMOS technology is relatively simple, and there is no special channel design, so the data of each pixel should be amplified before integration. The following figure is a schematic diagram of CMOS imaging module.

Extended data:

Sensor workflow:

CMOS image sensor has many functions and complex composition. It consists of image sensor, row-column switch, address decoder and A/D converter.

This requires many components to work according to certain procedures in order to coordinate the work of each component. In order to realize the workflow, it is necessary to set a timing pulse, use its timing relationship to control the running sequence of each part, and use its level or leading edge and trailing edge signals to adapt to the electrical performance of each part.

CMOS sensor directly converts electrons generated by image semiconductor into voltage signals, so it is very fast without complicated processing.

This advantage makes CMOS sensors very useful for high-frame cameras, and the high-frame speed can reach 400 to 2000 frames per second. This advantage is very useful for observing objects moving at high speed. However, because there is no high-speed digital signal processor, there are few high-speed cameras on the market, and the price is generally high.

References:

Baidu encyclopedia -CMOS camera