1. An image processing method, comprising: an input step of inputting multiple input images; a matching step of matching the input images according to corresponding positions; a determining step of determining a background image from the input images; a marking step of marking at least one moving object from at least one of the input images; and a replacing step of replacing a region, occupied by the moving object in at least one of the input images, with a corresponding regional background in another one of the input images.