| 摘要 |
PURPOSE: To highly accurately identify paper money by expressing the number of picture elements obtained by measuring the peak interval of reflected light outputted from a sheet of paper money by a histogram and comparing feature value distribution prepared by the histogram with a previously prepared microcharacter feature value. CONSTITUTION: Paper money 1 is carried in a direction rectangular to the character string 2 of microcharacters printed on the money 1. The carried money 1 is irradicated with detection light from an LED array 3 and a CCD linear sensor 5 arranged in parallel with the character string 2 detects reflected light from the money 1 through a lens optical system 4. The peak interval of an output from the sensor 5 is measured as the number of picture elements and the number of picture elements is expressed by a histgram to prepare feature value distribution. The distribution is compared with a previously prepared microcharacter feature value and whether the detected contents are microcharacters or not is determined by a signal processing circuit provided with a pattern matching means. |
