发明授权
- 专利标题： Creating multiple threshold matrices to be used in error diffused multilevel halftoning
- 专利标题（中）： 创建多个阈值矩阵，用于误差扩散多级半色调
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申请号： US11223942申请日： 2005-09-13
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公开(公告)号： US07760400B2公开(公告)日： 2010-07-20
- 发明人: Hiroshi Ishii , Etsuo Morimoto
- 申请人： Hiroshi Ishii , Etsuo Morimoto
- 申请人地址： JP Tokyo
- 专利权人： Ricoh Company, Limited
- 当前专利权人： Ricoh Company, Limited
- 当前专利权人地址： JP Tokyo
- 代理机构： Oblon, Spivak, McClelland, Maier & Neustadt, L.L.P.
- 优先权： JP2004-295189 20041007; JP2004-309717 20041025
- 主分类号： H04N1/40
- IPC分类号： H04N1/40
摘要：
In an image processor, a data corrector corrects input image data, a determining unit determines an output tone value of a target pixel from the corrected image data and threshold, and a calculator calculates a difference between the output tone value and the corrected image data as an error value. The threshold is set in such manner that a rate of change of the mean error of the error values with respect to a change in the input tone value is within a predetermined range.
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