| 摘要 |
<p>PURPOSE:To reduce moire and apply picture element density conversion to a mixed picture with an optional multiple by calculating density or brightness of a converted picture element and correcting the result of calculation so as to apply binarization. CONSTITUTION:The density of a converted picture element is calculated at an interpolation processing section 11 with respect to an original picture (1 bit), the result (n bits) of the calculation is binarized by a density preservation binarizing section 12 to obtain a converted output picture (1 bit). In order to reduce the deterioration in the picture quality due to quantization error in this case, the binarizing section 12 applies binarizing by the error diffusion method. As a result, moire caused when a picture subject to pseudo intermediate processing is converted is reduced and a picture in which a pseudo intermediate tone picture, characters and graphs exist in mixture is subject to picture element density conversion with an optional multiple.</p> |
