发明名称 |
Image processing method, image processing apparatus and storage medium |
摘要 |
A histogram of density difference between each pixel and an adjacent pixel is prepared from the image data obtained by pre-scanning an original. Then an approximation function for the density difference histogram is generated, and the kind of the original is discriminated as text/photograph/other based on the coefficient of the approximation function. According to the kind of the original, a density conversion table matching each kind is prepared, and is used for density correction of the image obtained by main scanning. For a text original, the density conversion table is prepared from the distribution of data close to the light and dark ends of the density histogram. For a photograph original, the density conversion table is prepared from the coefficient of the approximation function for the cumulative histogram of the density histogram.
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申请公布号 |
US2003043410(A1) |
申请公布日期 |
2003.03.06 |
申请号 |
US20020211520 |
申请日期 |
2002.08.05 |
申请人 |
FUKAWA KIMIHIKO;MAKINO YOICHIRO |
发明人 |
FUKAWA KIMIHIKO;MAKINO YOICHIRO |
分类号 |
H04N1/40;H04N1/407;(IPC1-7):G06T5/00;G06K9/34;H04N1/409 |
主分类号 |
H04N1/40 |
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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