The problem of image demosaicking (or demosaicing) is where an image has been captured through a color filter array (CFA), and the goal is to estimate complete color information at every pixel. This IPOL article describes the image demosaicking method proposed by Gunturk, Altunbasak, and Mersereau in "Color Plane Interpolation Using Alternating Projections." Given an initial demosaicking, the method improves the result by alternatingly applying two different projections. One projection copies

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... e green channel's wavelet detail coefficients to the red and blue channels while the other projection constrains the solution to agree with the observed data. Source Code ANSI C source code to produce the same results as the demo is accessible on the article web page http://dx.doi.org/10.5201/ipol.2011.g_gapd. This software includes the implementations of algorithms potentially linkable to patents. Various distribution terms apply. Some files are distributed under the terms of the simplified BSD license, some are for scientific and education use only. Future software releases and updates will be posted at