Abstract: We propose a method to synthetically create or restore typical color filter array (CFA) pattern in digital images. This can be useful, inter alia, to conceal traces of manipulation from forensic techniques that analyze the CFA structure of images. For continuous signals, our solution maintains optimal image quality, using a quadratic cost function; and it can be computed efficiently. Our general approach allows to derive even more efficient approximate solutions that achieve linear complexity in the number of pixels. The effectiveness of the CFA synthesis as tamper-hiding technique and its superior image quality is backed with experimental evidence on large image sets and against state-of-the-art forensic techniques. This exposition is confined to the most relevant 'Bayer'-grid, but the method can be generalized to other layouts as well.

  author       = {Matthias Kirchner and Rainer B\"{o}hme},
  url          = {http://www.inf.tu-dresden.de/~rb21/publications/KB2009_CFA-Synthesis_SPIE.pdf},
  booktitle    = {Proceedings of SPIE},
  volume       = {7254},
  year         = {2009},
  title        = {Synthesis of color filter array pattern in digital images},
  pages        = {72540K},