Image Sensor:
A device that converts an optical image to an electric signal. There two types of image sensor, that is Couple-Charged Device (CCD) and Complementary metal-oxide-semiconductor (CMOS). Firstly, here is the basic operation of CCD type. when light strikes the chip it is held as a small electrical charge in each photo sensor. The charges are converted to voltage one pixel at a time as they are read from the chip. Additional circuitry in the camera converts the voltage into digital information. i prepare the video how it work below...
And below also video that explain comparison between CCD with CMOS
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