| 摘要 |
PROBLEM TO BE SOLVED: To generate and register a mark by which a sender can uniquely characterized. SOLUTION: A user draws a prescribed mark on a section paper sheet, a read section reads the mark by one line each and stores the read result to a read memory (steps S1, S2). Then mask data by one byte are read from the read memory (step S3), '0' is set to mark information data to initialize the data (step S4) and whether or not the read data are all black or white data is discriminated (steps S5, S7). When the data are not all the white data and the black data, number of black level bits of the read data is counted (steps S9-S12). When the count is a prescribed bit number or more, the data are decided to be the black data (step S14), and in other cases, the data are decided to be white data (step S15) so as to recognize the mark and register it (step S17).
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