An image processing apparatus that receives mosaic image data having settings of only one color component, R, G, or B, in each pixel and subjects the received mosaic image data to a series of image processing to generate color image data with settings of all the three color components, R, G, and B, in each pixel; wherein the mosaic image data has the form of a Bayer color filter array; and the image processing apparatus includes: a vertical-direction color difference component computation module; a horizontal-direction color difference component computation module; an edge direction determination module; a color component interpolation module; an oblique edge pixel detection module; an oblique edge direction determination module; and an oblique edge pixel interpolation correction module.