Color Filter Array Synthesis in Digital Image via Dictionary Re-demosaicing

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.