| 摘要 |
<p>PURPOSE:To perform such proper resolution conversion that characters and photographs are superior in definition and gradient and especially characters and thick lines are free from jaggedness and narrow lines and fine characters are free from blur and breaks. CONSTITUTION:Image data is inputted to a resolution conversion processing part 4 which uses the closest picture element substitution method to perform the resolution conversion, a resolution conversion processing part 5 which uses the linear interpolation method to perform the resolution conversion, and an edge detecting and narrow line detecting part 6. This detecting part detects an edge part and detects whether the edge part is a narrow line part or not at the time of detecting the edge part to discriminate whether this edge part is a narrow line edge part or the other part. An output selecting means 7 selects and outputs image data from the resolution conversion processing part 4 when the detecting part discriminates a narrow line edge part; but it selects and outputs image data from the resolution conversion processing part 5 when the detecting part discriminates the part other than narrow line edge parts.</p> |
