Image sensors and optical devices

In a Bayer color filter array, which color appears most often in each 2×2 block of pixels?

  1. ARed
  2. BBlue
  3. CGreen
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Answer: C. Green

A Bayer array places one red, one blue and two green filters in each 2×2 block. The human eye is most sensitive to green and gets most of its brightness information from green, so more green improves perceived resolution. The missing colors at each pixel are interpolated from surrounding pixels.

Bayer color filter array R G R G G B G B R G R G G B G B In each 2×2 block 2 green, 1 red, 1 blue The eye is most sensitive to green, so green gets two pixels Missing colors at each pixel are filled in from neighbors (demosaicing)
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