The present invention provides for an image-processing device capable of printing oblique lines with an angle of approximately 45 degrees and constant width at any time to obtain a printed image of superior quality. The stereo matching apparatus includes a window image extraction unit for extracting window images, each having a predetermined size around a selected pixel, for individual pixels of images that constitute stereo images. The invention further relates to corn seeds and plants produced by crossing plants of variety CV580523 with plants of another variety, such as another inbred line. To each machine element to be positioned a display unit connected to the corresponding computing element is assigned which displays the difference between the desired position and the actual position calculated by the corresponding computing element.