Color Filter Arrays Based on Mutually Exclusive Blue Noise Patterns

摘要

The ordered color filter arrays (CFA) used in single-sensor, color digital still cameras introduce distracting color artifacts. These artifacts are due to the phase-shifted, alludes signals introduced by the spare sampling by the CFAs. This work reports the results of an investigation on the possibility of using random patterns as a CFA for single-sensor, digital still cameras. From a single blue noise mask pattern, three mutually exclusive, random CFAs are constructed representing the red, green and blue color filters. An edge adaptive method, consisting of missing-pixel edge detection and boundary-sensitive interpolation is employed to reconstruct the entire image. Experiments have shown that the random CFA alleviates the problem of the low-frequency color banding associated with ordered arrays. This method also has the advantage of better preserving color-free, sharp neutral edges and results in less deviation-from-neutral on high-frequency, monochrome information.