ABSTRACT
Color-filter-array (CFA) sampling of color images involves a spatial-domain multiplexing of three or more color components of a color image, each on a subset of the lattice consisting of all sensor elements. In the frequency domain, this same operation can be viewed as the frequency-domain multiplexing of a luma component at baseband and two or more chrominance components centered at certain spatial modulation frequencies. This view leads to some very efficient demosaicking algorithms that would not normally be evident from the spatial-domain representation. This chapter presents the frequency-domain representation for general periodic CFA structures and describes efficient demosaicking algorithms based on spatial filtering derived from this representation.
