What is a CMOS camera?

What is a CMOS camera? CMOS sensor is a kind of sensor whose sensitivity is usually 10 times lower than that of CCD sensor. Because human eyes can see the target under the illumination below 1Lux (full moon night), CCD sensors can usually see the sensitivity of 0. 1~3Lux and 3 to 10 times that of CMOS sensors slightly better than human eyes.

Generally, the sensitivity of CMOS sensor is in the range of 6 ~ 15 lux, and the noise of CMOS sensor is 10 times higher than that of CCD sensor. Fixed pattern noise always stays on the screen like a pattern, because CMOS sensors are basically useless below 10Lux, so a large number of cameras use CCD sensors, and CMOS sensors are generally used in very low-end home security.

With two exceptions, CMOS sensors can be made very large and have the same sensitivity as CCD sensors. CMOS sensor is very fast, which is 10 to 100 times faster than CCD sensor, so it is very suitable for special applications such as high ens DSC camera (Cannon D-30) or high-format camera.

CMOS sensor can put all logic and control circuits on the same silicon chip, which makes the camera simple and portable, so CMOS camera can be made very small.

Although the energy consumption of CMOS cameras is the same as or higher than that of CCD cameras, CMOS sensors use few CDS, TG and DSP rings, so the total energy consumption of the same size is reduced by 1/2 to 1/4 compared with CCD cameras.

Generally, the power consumption of a CCD camera is12v/150 to 300mA, so it is 2 to 4 times higher than CMOS's 5 to12v and 35 to 70mA.

Interestingly, although CCD said? Charge coupled device? And CMOS said? Complementary metal oxide semiconductor? But neither CCD nor CMOS is suitable for image sensing. The sensor that really perceives is called. Image semiconductor? , CCD and CMOS sensors (temporarily called) actually use the same sensor? Image semiconductor? Image semiconductor is a P-N junction semiconductor, which can convert the photon explosion junction of light into a proportional number of electrons. The number of electrons is calculated by the voltage of the signal. The more light enters the image semiconductor, the more electrons are generated, and the higher the voltage output by the sensor.

What is the name of CCD? Charge coupled device? In fact, CCD only stores electrons coming out of the image semiconductor in an organized way.

Is CMOS called complementary metal oxide semiconductor? In fact, CMOS is just a technology of putting transistors on silicon blocks, which has no more significance. The sensor is called CMOS sensor only to distinguish it from CCD sensor, and it has nothing to do with the real method of image processing by the sensor.

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.