Improved demosaicking in the frequency domain by restoration filtering of the LCC bands
Markus Beermann, Éric Dubois · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2007
The recovery of a full resolution color image from a color filter array like the Bayer pattern is commonly regarded as an interpolation problem for the missing color components. But it may equivalently be viewed as the problem of channel separation from a frequency multiplex of the color components. By using linear band-pass filters in a locally adaptive manner, this latter view has earlier been successfully approached, providing state-of-the-art performance in demosaicking. In this paper, we address remaining shortcomings of this frequency domain method and discuss a locally adaptive restoration filter. By implementing restoration as an extension of the bilateral filter, reasonable complexity of the method can be sustained while being able to improve resulting image quality by up to more than 1dB.