In some capturing devices, such as digital cam- eras, there is only one color sensor at each pixel. Usually, 50 /100 of the pixels have only a green sensor, 25 /100 only a red sensor, and 25 /100 only a blur sensor. The problem is then to restore the two missing colors at each pixel-this is called "demosaicing", because the original samples are usu- ally 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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