| 摘要 |
<p>PURPOSE:To reduce a misreading rate, by detecting the signal obtained from a scan at a mark detecting part after converting the signal into a set pattern through a converting circuit and then detecting a mark with a pattern suited to the detection of mark. CONSTITUTION:The signal supplied from a picture signal generating part 101 has a black part equivalent to 8 bits when a mark measures 1mm.. The delivered mark signal is applied to an ROM103 functioning as a converting circuit via an address bus 102. As the mark signal contains 8 bits, 256 types of address patterns are obtained. However the signals which are evidently considered as noises are converted into a pattern. The converted signals are decided at a mark detecting part 105.</p> |
