1 : An image processing method of processing an image displayed on a display device, the image processing method in which the image is printed on a sheet on which a dot pattern has been printed, and the dot pattern is imaged by an imaging means, thereby enabling position recognition on the image, the image processing method comprising: printing the dot pattern indicating XY coordinates on the sheet; printing the image displayed on a screen of the display device, on the sheet on which the dot pattern is printed; setting and printing a reference point of the image displayed on the display device in a form of a visible mark together with the image, at the printing the image; performing calibration to match coordinates of a position of the mark on the sheet with the reference point of the image, by imaging the mark printed on the sheet by the imaging means; and performing an image processing on the image printed on the sheet by the imaging means.