发明名称 |
Image processing method and apparatus utilizing halftone processing and test patch |
摘要 |
Upon setting of a halftone process of an initial setting, there is such a problem that graininess deteriorates due to an aging change or an environmental change. To solve this problem, an image processing apparatus executes a halftone process on a test image for tone correction and prints the processed test image; forms a tone correction table in accordance with read values from the printed test image; obtains graininess from a read value of a low density portion of a tone correction patch of the test image for the tone correction; discriminates whether the obtained graininess exceeds a predetermined reference level; and changes a setting of the halftone process so as to reduce the graininess when it is discriminated that the obtained graininess exceeds the predetermined reference level. |
申请公布号 |
US8625166(B2) |
申请公布日期 |
2014.01.07 |
申请号 |
US201113097706 |
申请日期 |
2011.04.29 |
申请人 |
YABE TAKASHI;CANON KABUSHIKI KAISHA |
发明人 |
YABE TAKASHI |
分类号 |
G06T5/00;G06K15/00;H04N1/40 |
主分类号 |
G06T5/00 |
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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