1. An image correction apparatus comprising: a difference computing unit which computes an absolute difference value between corresponding pixels in a first and a second image; a combining ratio computing unit which computes a combining ratio of the second image to the first image so that the combining ratio decreases as the absolute difference value of each pixel contained in a filter region defined around an attention pixel on the first image increases; and a combining unit which produces a corrected image by combining the value of the attention pixel in the first image with the value of the corresponding pixel in the second image in accordance with the combining ratio computed for the attention pixel and by taking the combined value as the value of the corresponding pixel in the corrected image.