Frequency selection demosaicking:: A review and a look ahead

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 CFA(2,3) 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 estimation(4) or with an adaptive method(5).