An image sensor is a device that converts an optical image into an electronic signal. It is used mostly in digital cameras, camera modules and other imaging devices. Early analog sensors were video camera tubes, most currently used are digital charge-coupled device (CCD) or complementary metal–oxide–semiconductor (CMOS) active pixel sensors.
Read more about Image Sensor: CCD Vs CMOS, Performance, Color Separation, Specialty Sensors, Sensors Used in Digital Cameras, Companies
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—Allen Tate (1899–1979)