Four Direction Residual Interpolation for Demosaicking

In this paper, we propose a four direction residual interpolation method for color filter array interpolation. The proposed algorithm exploits a guided filtering process to generate the tentative image. The residual image is generated by exploiting the tentative and original images. We use a four direction residual interpolation algorithm to more accurately estimate the missing pixel values; the estimated image is adaptively combined with a joint inverse gradient weight. Based on experimental results, the proposed method provides superior performance in terms of objective and subjective quality compared to conventional state-of-the-art demosaicking methods.