| 摘要 |
<p>PURPOSE:To exactly execute a binarization, even if an analog signal whose crest value is large and an analog signal whose crest value is small are inputted continuously, by determining a variable threshold by utilizing the local variation of a signal itself. CONSTITUTION:A photoelectric transducer A has a positive peak in several places, and is inputted to a delaying circuit 1. In the delaying circuit 1, said element is delayed and three outputs Q1-Q3 are generated. Subsequently, in an OR circuit 21, by taking the maximum value of the delay outputs of Q1 and Q2, a threshold H is determined, and this threshold H and a signal Q2 to be binary-coded, namely, a signal S are compared by a comparator 5. As a result, for instance, in case of S>H, it is decided to be a black picture element, and in case of S<H, it is decided to be a white picture element.</p> |
