1. An image processing apparatus comprising: an assumed deteriorated image pixel value computing unit configured to calculate a pixel value of an assumed deteriorated image, which is an image where deterioration of a target image made up of a plurality of channels is assumed, for each of said channels as an assumed deteriorated image pixel value; a pseudo target image pixel value computing unit configured to calculate, regarding a pixel of interest that is a pixel of said target image corresponding to a pixel of said assumed deteriorated image, a pixel value estimated for each of said channels as a pseudo target image pixel value for each of said channels based on the pixel value of said pixel of interest, and the pixel values of pixels adjacent thereto; and a restored image creating unit configured to create a restored image restored from said target image based on said calculated assumed deteriorated image pixel value and said calculated pseudo target image pixel value.