A generalized model for detection of demosaicing characteristics

Detection of demosaicing characteristics based on correlation at pixel level is useful for image forensic purposes. In this paper, we propose a new model to detect the demosaicing characteristics based on the second-order derivative correlation. Without the influences of the uneven DC components in the three color channels, the new model can estimate both intra-channel and cross-channel correlation. Experimental results show efficacy of the proposed model.