发明授权
US07924465B2 Dither matrix, image processing method, storage medium, image processing apparatus, image forming apparatus, and image forming system
有权
抖动矩阵，图像处理方法，存储介质，图像处理装置，图像形成装置和图像形成系统
- 专利标题： Dither matrix, image processing method, storage medium, image processing apparatus, image forming apparatus, and image forming system
- 专利标题（中）： 抖动矩阵，图像处理方法，存储介质，图像处理装置，图像形成装置和图像形成系统
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申请号： US11794286申请日： 2006-11-01
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公开(公告)号： US07924465B2公开(公告)日： 2011-04-12
- 发明人: Takahiro Ike , Masakazu Yoshida , Takashi Kimura , Masanori Hirano , Shigetoshi Hosaka
- 申请人： Takahiro Ike , Masakazu Yoshida , Takashi Kimura , Masanori Hirano , Shigetoshi Hosaka
- 申请人地址： JP Tokyo
- 专利权人： Ricoh Company, Ltd.
- 当前专利权人： Ricoh Company, Ltd.
- 当前专利权人地址： JP Tokyo
- 代理机构： Cooper & Dunham LLP
- 优先权： JP2005-318669 20051101; JP2006-279108 20061012
- 国际申请： PCT/JP2006/322325 WO 20061101
- 国际公布： WO2007/052832 WO 20070510
- 主分类号： H04N1/40
- IPC分类号： H04N1/40 ; H04N1/405 ; G06K15/00
摘要：
A disclosed dither matrix is used in halftone processing for converting input image data having M input halftone levels into output image data having N (M>N>2) output halftone levels. In the halftone processing, a concentration type dither matrix is used as the dither matrix when an input halftone level is within a range of input halftone levels corresponding to an output halftone level that is lower than a predetermined threshold level T (N>T>1), and a dispersion type dither matrix is used as the dither matrix when the input halftone level is within a range of input halftone levels corresponding to an output halftone level that is equal to or higher than the predetermined threshold level T.
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