An artificial neural network is provided, which is configured to convert a mosaic image representable by pixels with color pixel values corresponding to a plurality of colors to a plurality of color difference images corresponding to the plurality of colors. A plurality of output color difference images corresponding to the plurality of colors are generated based on an input mosaic image representable by pixels with color pixel values corresponding to the plurality of colors using the artificial neural network. A plurality of demosaiced color images corresponding to the plurality of colors are generated by summing, pixel by pixel, the input mosaic image and each of the plurality of output color difference images.