发明名称 |
Image forming apparatus and control method thereof |
摘要 |
<p>A 2-pixel averaging unit (101) halves an input image in the subscanning direction, and a multi-level error diffusion unit (102) performs multi-level error diffusion processing. A 2-pixel reconstruction unit (103) replaces each pixel with two pixels adjacent in the subscanning direction. A density value exchange unit (104) exchanges pixel values adjacent in the subscanning direction in each of 2 x 2 pixel blocks arranged in a checkered pattern in the image after replacement. High-density blocks each serving as a set of high-density dots and low-density blocks each serving as a set of low-density dots can be generated as 2 x 2 pixel blocks. The exposure region can be concentrated in PWM conversion.</p> |
申请公布号 |
EP2180686(A1) |
申请公布日期 |
2010.04.28 |
申请号 |
EP20090173642 |
申请日期 |
2009.10.21 |
申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
ARAKI, GO;TAKAYAMA, YUUJI;SAIKI, TOMOYUKI;ISHIKAWA, HISASHI |
分类号 |
H04N1/405 |
主分类号 |
H04N1/405 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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