The ordered color filter arrays (CFA) used in single-sensor, colordigital still cameras introduce distracting color artifacts. Theseartifacts are due to the phase-shifted, alludes signals introduced bythe spare sampling by the CFAs. This work reports the results of aninvestigation on the possibility of using random patterns as a CFAfor single-sensor, digital still cameras. From a single blue noisemask pattern, three mutually exclusive, random CFAs are constructedrepresenting the red, green and blue color filters. An edge adaptivemethod, consisting of missing-pixel edge detection andboundary-sensitive interpolation is employed to reconstruct theentire image. Experiments have shown that the random CFA alleviatesthe problem of the low-frequency color banding associated withordered arrays. This method also has the advantage of betterpreserving color-free, sharp neutral edges and results in lessdeviation-from-neutral on high-frequency, monochrome information.
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