1. An image processing system comprising: an image quality computation unit, comprising: a first determining unit that determines a first count of horizontally convex shapes in a portion of the first binary coded pixel character image data, a second determining unit that determines a second count of black/white pixel reversals in said portion, a third determining unit that determines a ratio of the first count to the second count, and a fourth determining unit that determines a quality of the first binary coded pixel character image data based on said ratio; and an image input device that inputs the first binary coded pixel character image data to the image quality computation unit.