CCD vs. CMOS

April 20, 2011 by
Filed under: CCTV Articles, Comparisons, General Technology 

CCD (charge coupled device) and CMOS (complementary metal oxide semiconductor) image sensors are two different technologies for capturing images digitally. Rather you choose CCD or CMOS, neither is superior to the other, With the availability of IP cameras, discussions have surfaced if CCD or CMOS provide better results versus the other.

Both types of chips convert light into electric charge and process it into electronic signals. In a CCD sensor, every pixel’s charge is transferred through a very limited number of output nodes (often just one) to be converted to voltage, buffered, and sent off-chip as an analog signal. All of the pixel can be devoted to light capture, and the output’s uniformity is high. In a CMOS sensor, each pixel has its own charge-to-voltage conversion, and the sensor often also includes amplifiers, noise-correction, and digitization circuits, so that the chip outputs digital bits. These other functions increase the design complexity and reduce the area available for light capture. With each pixel doing its own conversion, uniformity is lower.

For the current IP cameras, CMOS is the preferred choice based on the following advantages:

If size is not a consideration

-More suitable for HD monitor features

-Faster response rate

-Declining prices for high-end sensors

Comments

2 Comments on CCD vs. CMOS

  1. fred on Fri, 29th Apr 2011 8:08 am
  2. makes since to me now that CMOS would be used more for IP cameras after I read this article

  3. Malik on Sat, 7th May 2011 12:08 am
  4. Still i prefer to use CCD as compared to CMOS as uniformity is always a concern. Thanks

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