IMAGE PROCESSING METHOD AND DEVICE, COPYING MACHINE, SCANNER AND PRINTER USING IT

摘要

PURPOSE:To obtain the image processing method in which an existing position of a specific pattern specifying a detection object is obtained accurately and segmented so as to attain accurate discrimination and forgery is not easily made. CONSTITUTION:A prescribed positioning marks 4 and dummy marks 5 similar to them are provided to a prescribed position of an image to be detected. Then a specific pattern 6 is set to a position apart from the positioning marks by a prescribed interval. Since a 3rd party easily recognizes the pattern as a mere pattern and it is difficult to specify a real mark among lots of the marks concretely, forgery is hardly executed. When when the image is loaded to a copying machine, the presence of the positioning marks is detected by a 1st scanning and the existing area of the specific pattern is calculated from the existing position of the positioning marks in a 2nd scanning (since the positioning marks are arranged asymmetrically, the existing position of the specific pattern is definitely obtained from the existing position of the marks), an image of a relating area is segmented to discriminate whether or not the specific pattern is in existence in the area.