| http://www.w3.org/ns/prov#value | - FIG. 8 is a flowchart showing the basic process of the method of tracking a detected object according to the subtraction method, comprising an image input step 801 for producing an input image 701 from an image input device such as a camera, a subtraction processing step 802 for producing a difference image 703 from the difference for each pixel between the input image 701 and a reference backgrou
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