Additional circuitry in the camera converts the voltage into digital information.Ī CMOS imaging chip is a type of active pixel sensor made using the CMOS semiconductor process. The charges are converted to voltage one pixel at a time as they are read from the chip. When light strikes the chip it is held as a small electrical charge in each photo sensor. Each cell of a CCD image sensor is an analog device.The sensor used in a digital camera has a 2-D array of thousands or millions of tiny solar cells, each of which transforms the light from one small portion of the image into electrons.CMOS cameras are usually less expensive and have great battery life. CMOS sensors are just now improving to the point where they reach near parity with CCD devices in some applications. CMOS sensors traditionally have lower quality, lower resolution and lower sensitivity. Both types of sensor accomplish the same task of capturing light and converting it into electrical signals.Įach has unique strengths and weaknesses giving advantages in different applications.ĬCDs tend to be used in cameras that focus on high-quality images with lots of pixels and excellent light sensitivity. An image sensor is a device that converts an optical image into an electronic signal (convert light into electrons).ĬCD (charge coupled device) image sensor or a CMOS (complementary metal oxide semiconductor) sensor.
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