| 摘要 |
<p>Compensation patterns are formed on a conveyer belt. Sensors detect the compensation patterns and output a signal. A frequency component that is above the frequency that corresponds to the compensation patters is cut of f by a filter. The positions of the compensation patters are determined based on the output of the filter. The filter is, for example, an IIR type digital filter. A correction value is calculated based on the determined positions of the compensation patters. A driver is controlled based on the correction value. As a result, images of different colors can be matched accurately. <IMAGE> <IMAGE></p> |
