A CPU displays an image on a display device with reference to an image location table stored in advance in a RAM. When coordinates on the image are sequentially designated by an input device, the CPU sequentially compares the locations specified by the designated coordinates with those of checking points...http://www.google.com/patents/US6862687?utm_source=gb-gplus-sharePatent US6862687 - Checking device and recording medium for checking the identification of an operator
