In this paper, we restate the model of spatio-chromatic sampling in single-chip digital cameras covered by Color Filter
Array (CFA)1. The model shows that a periodic arrangement of chromatic samples in the CFA gives luminance and
chromatic information that is localized in the Fourier domain. This representation allows defining a space invariant
uniform demosaicking method which is based on the frequency selection of the luminance and chrominance information.
We then show two extended methods which used the frequency representation of the Bayer CFA2,3 to derive adaptive
demosaicking. Finally, we will show the application of the model for CFA with random arrangement of chromatic
samples, either using a linear method based on Wiener estimation4 or with an adaptive method5.
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