| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain a high-quality output image in which a jaggy or a disconnection of a thin line hardly stands out even when image data of an M-level tone is converted into that of an N-level tone reproducible by a printer engine. <P>SOLUTION: An edge detection unit 3100 detects whether the pixel of interest in input multilevel image data is an edge pixel or a non-edge pixel positioned in edge to outputs the detection results to a selector 3240. A screen processing unit 3210 performs screen processing for the pixel of interest to determine the output value of the N-level tone. A correction/binarization calculation unit 3230 performs first filtering processing having a preset visual sense characteristic for an area including the pixel of interest to calculate the target value of the pixel of interest, and corrects the value of the pixel of interest so as to come close to the target value, thereby determining the output value of the N-level tone. The selector 3240 selects and outputs the results from the correction/binarization calculation unit 3230 or that from the screen processing unit when the pixel of interest is an edge pixel or when the pixel of interest is a non-edge pixel. <P>COPYRIGHT: (C)2009,JPO&INPIT |
