In order to accurately restore the texture on the oblique edges and improve the overall resolution of the demosaiced image,a convolutional neural network demosaicing algorithm is proposed based on residual interpolation.The algorithm uses the information of Bayer color filter arrays to calculate the gradient of diagonal edges,which can be used to determine the edge directions.Therefore,the corresponding interpolation formula is proposed for different edges.We incorporate the convolutional neural networks into our method to refine the interpolated images.To demonstrate the superiority of the proposed algorithm,several experiments were conducted with IMAX dataset.The experimental results show that the proposed algorithm exhibits better visual effect,higher PSNR and shorter running time compared with those of commonly used Bayer demosaicing algorithms.