Color filter array synthesis in digital image via dictionary re-demosaicing

  • Sun G
  • Shen Z
  • Chen Y
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Abstract

The goal of anti-forensic technique is to hide manipulation traces. We present a scheme of Color Filter Array (CFA) synthesis in digital images via dictionary re-demosaicing. This is an anti-forensic technique to be against a plurality of forensic methods based on CFA structure detection in images. First, through sparse representation on a manipulated image, a dictionary is obtained. Then, arbitrary CFA de-mosaicing schemes are allowed to re-demosaic each dictionary atom. Finally, the manipulated image is reconstructed using the re-demosaiced dictionary. Experimental results demonstrate that both satisfied image quality in terms of PSNR and stronger CFA characteristic are achieved.

Author-supplied keywords

  • CFA synthesis
  • Dictionary re-demosaicing
  • Sparse representation

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Authors

  • Guangling Sun

  • Zhoubiao Shen

  • Yuejun Chen

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