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Demosaicing

High quality color imaging requires the sampling of three spectral bands at the same position and at the same time. While solutions exist the most common setup is based on a trick: a lattice of pixels, whose over number corresponds to the sensor resolution, is split into three different groups. The pixels of each group are covered with a small color filter. The result is that spectral information is not spatially aligned: each pixel only has information on one color. Full color information must then be recovered using interpolation techniques and the result is different from what would be obtained with full resolution color imaging especially in the proximity of color discontinuities.
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Figure 2.5: Recovering full resolution color information using interpolation techniques is a cheap (but suboptimal) solution that may result in noticeable artifacts.
[width=10cm]figures/mosaicImage.jpg
[width=10cm]figures/deltaImage.jpg
[width=10cm]figures/errorRow.jpg



Roberto Brunelli 2008-11-25