发明授权
- 专利标题： Image processing apparatus using derived ordered dither matrix
- 专利标题（中）： 使用派生有序抖动矩阵的图像处理设备
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申请号： US200661申请日： 1994-02-23
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公开(公告)号： US5640249A公开(公告)日： 1997-06-17
- 发明人: Gururaj Rao , Hiroki Kanno
- 申请人： Gururaj Rao , Hiroki Kanno
- 申请人地址： JPX Kanagawa-ken
- 专利权人： Kabushiki Kaisha Toshiba
- 当前专利权人： Kabushiki Kaisha Toshiba
- 当前专利权人地址： JPX Kanagawa-ken
- 优先权： JPX5-038113 19930226
- 主分类号： H04N1/40
- IPC分类号： H04N1/40 ; H04N1/405 ; H04N1/46
摘要：
In multi-gradation level processing performed by using an ordered dither scheme, offset information between one dither matrix value and dither matrices is set, and all multi-gradation level threshold values are calculated from the basic dither matrix values and the offset information. Multi-gradation level processing is performed by comparing an input image with the calculated threshold values. With this operation in the multi-gradation level processing performed by the ordered dither scheme, all the dither threshold values required for the multi-gradation level processing are generated from the basic dither matrix information and the offset information.