Color filter array Demosaicing

the bayer arrangement of color filters on pixel array of image sensor. each two-by-two cell contains 2 green, 1 blue, , 1 red filter.

a color filter array mosaic of color filters in front of image sensor. commercially, commonly used cfa configuration bayer filter illustrated here. has alternating red (r) , green (g) filters odd rows , alternating green (g) , blue (b) filters rows. there twice many green filters red or blue ones, catering human eye s higher sensitivity green light.

since color subsampling of cfa nature results in aliasing, optical anti-aliasing filter typically placed in optical path between image sensor , lens reduce false color artifacts (chromatic aliases) introduced interpolation.

since each pixel of sensor behind color filter, output array of pixel values, each indicating raw intensity of 1 of 3 filter colors. thus, algorithm needed estimate each pixel color levels color components, rather single component.