A motion coordinate calculator stores the pre processed current central image as X/Y axis reference image candidates, determines replacement of X/Y axis reference images for {HEAD ~ calculation} of {TAIL ~ motion coordinate values} of a next pre processed image in accordance with X/Y axis motions of the pre processed current image, and compares the pre processed current image with the X/Y axis reference images, thereby calculating X/Y axis motion coordinate values of the pre processed current image 
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A motion coordinate calculator stores the pre processed current central image as X / Y axis reference image candidates , determines replacement of X / Y axis reference images for { HEAD ~ calculation } of { TAIL ~ motion coordinate values } of a next pre processed image in accordance with X / Y axis motions of the pre processed current image , and compares the pre processed current image with the X / Y axis reference images , thereby calculating X / Y axis motion coordinate values of the pre processed current image
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