发明授权
US08237986B2 Image reading apparatus, multifunction printer apparatus, and image processing method
有权
图像读取装置,多功能打印机装置和图像处理方法
- 专利标题: Image reading apparatus, multifunction printer apparatus, and image processing method
- 专利标题(中): 图像读取装置,多功能打印机装置和图像处理方法
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申请号: US12339040申请日: 2008-12-19
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公开(公告)号: US08237986B2公开(公告)日: 2012-08-07
- 发明人: Takashi Nakamura , Fumihiro Goto , Tohru Ikeda , Akitoshi Yamada , Hidetsugu Kagawa
- 申请人: Takashi Nakamura , Fumihiro Goto , Tohru Ikeda , Akitoshi Yamada , Hidetsugu Kagawa
- 申请人地址: JP Tokyo
- 专利权人: Canon Kabushiki Kaisha
- 当前专利权人: Canon Kabushiki Kaisha
- 当前专利权人地址: JP Tokyo
- 代理机构: Canon USA Inc IP Division
- 优先权: JP2007-331067 20071221
- 主分类号: H04N1/60
- IPC分类号: H04N1/60
摘要:
This invention is directed to a method capable of performing appropriate under color removal in image original reading. According to this method, under color removal of the original is performed as follows. A printing medium without any printed image is read by primary and complementary color readings. A brightness signal distribution is generated by converting, using a provisional table, each of image data generated by the reading methods. The lowest one of signal levels is selected from each of the distributions. In correspondence with each of the primary and complementary color readings, a conversion table is formed, which converts the image data to make a pixel value corresponding to the selected lowest one of the signal levels to a value representing white. Under color removal of the image data is performed using a corresponding conversion table in accordance with the reading method of the image original.