An improved demosaicing algorithm by adopting color correlation aided gradients

This paper proposes a novel demosaicing algorithm based on improved gradients with color correlation. Compared to conventional method, especially on region with dense lines and textures, the proposed method may reduce the probability on the edge direction judgment, which may lead to obvious artifacts. The improved adaptive gradients calculation uses color correlation information. The proposed method can effectively suppress the artifacts and increase average PSNR on R, G and B channels by 0.59db, 0.69db and 0.56db respectively.