Color Filter Array Image Analysis for Joint Denoising and Demosaicking

A single-chip image sensor used in almost all consumer and in some professional-grade digital cameras today is affixed with an alternating pattern of spectrally shifted (in the electromagnetic wavelength sense) color filters to each pixel location. The arrangement of color filters, which are typically the canonical color triples (i.e. red, green, blue), is called color filter array (or CFA) [1, 2, 3, 4, 5]. The arrangement in figure 1.1(b) is called the Bayer pattern and is the most prevalent pattern digital cameras today. Only one-third of the full-color image data is observed, and the process of estimating the full-color image given the observed pixel components is often referred to as demosaicking or CFA interpolation in the literature Existing alternatives to the cost-effectiveness single-chip solution to camera designs carry their own design peculiarities as well. For example, a design of cameras with three image sensors, each dedicated to a primary color, or three-color sensor, such as the one introduced by Foveon, allows bypassing of demosaick