1. An image correction system for correcting image data from pixels connected to at least two different input paths, the image correction system comprising: an input unit which inputs image data of a correction target; a pixel value relationship extraction unit which extracts a relationship of pixel values among adjacent pixels from the image data of the correction target; a pixel value relational expression estimation unit which estimates a relational expression representing a characteristic difference at each pixel from the relationship of the pixel values among the adjacent pixels; a pixel value correction unit which generates a correction image by correcting pixel values of the image data of the correction target using the relational expression; and an output unit which outputs the correction image.