One challenge of designing a demosaicking method for cameras likely to be subject to chromatic aberration is the fact that cross-color correlation is significantly weakened. As a result, most demosaicking methods fail in presence of chromatic aberration—output images suffer from severe zippering artifacts. The key challenge for designing “chromatic aberration-tolerant demosaicking” is to recover the color image despite relaxing the correlation between color components. We developed a Posterior Sparsity-Directed Demosaicking (PSDD) method that does not rely on the color correlation, instead drawing on the notion of sparse representation to overcome potential hazards of aliasing. PSDD reliably recovers the chromatic aberrated image that is formed at the image plane/detector without suffering from zippering artifacts.
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