| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology of obtaining a pleasant print output with smooth gradation and high edge reproducibility while keeping an inter-dot interval. SOLUTION: The image processing apparatus receives image data the each pixel of which has a prescribed gradation value, starts searching an initial pixel, and selects pixels configuring a cell until the total sum of the gradation values of pixels including the searched pixels reaches a prescribed threshold or over. When an average gradation value of the pixels in the cell is a prescribed value (e.g., "30") or over in this case, the threshold is changed from "255" used so far into "510" for example in order to keep the inter-dot interval. Further, when a difference between a maximum gradation value and a minimum gradation value in the cell is greater than a prescribed value (e.g., "50"), it is discriminated to be an edge area and the revised threshold value "510" is decreased into "255" to increase doth density. Further, the pixels are selected from pixels closest to the gravity center position. When the pixels are selected as the average gradation value reaches the threshold or over, a dot is generated to the gravity center position. COPYRIGHT: (C)2005,JPO&NCIPI
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