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Restoring subsampled color images


In some capturing devices, such as digital cameras, there is only one color sensor at each pixel. Usually, 50% of the pixels have only a green sensor, 25% only a red sensor, and 25% only a blue sensor. The problem is then to restore the two missing colors at each pixel – this is called “demosaicing”, because the original samples are usually arranged in a mosaic pattern. In this short paper, a few demosaicing algorithms are developed and compared. They all incorporate a notion of “smoothness in chroma space”, by imposing conditions not only on the behavior of each color channel separately, but also on the correlation between the three channels.

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Keren, D., Osadchy, M. Restoring subsampled color images. Machine Vision and Applications 11, 197–202 (1999).

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  • Key words:Demosaicing – Color interpolation – Regularization