| 摘要 |
<p>PURPOSE:To realize smooth binary reproduction with clear edge obtained in a line picture area and noise, etc., suppressed in a halftone area respectively by changing the characteristics of a space filter used by the feature value of the input picture signal and also changing the binarizing method. CONSTITUTION:A feature extracting means 102 extracts the feature value, e.g., the density gradient of the picture in an area near a noted picture element out of the input picture signal. A switching means 105 switches a space filter means 103 and 104 based on the feature value received from the means 102 for output of the multi-level picture signal where the noises are reduced at a flat part with sharp edges of pictures kept as they are. A binarizing means 108 and 109 perform the binarizing processes with a systematic dither method, a comparison method with the fixed threshold value, etc. A switching means 110 switches the means 108 and 109 by the feature value received from the means 102 for output of the binarized signal where the high contrast secured at a character part with the noises reduced at a photograph part respectively. Thus, it is possible to attain the binary reproduction of the smooth photograph part and the clear character part respectively despite the noises included in the input pictures.</p> |
