发明名称 |
Signal processing method, signal processing apparatus, and image reading apparatus |
摘要 |
Upon processing a visible light image signal and infrared image signal respectively obtained by illuminating a transparent document with light beams coming from a visible light lamp for mainly emitting visible light and an infrared lamp for mainly emitting infrared light, and photoelectrically converting optical images of the transparent document, a histogram is generated on the basis of the infrared image signal, a threshold value is calculated based on the histogram, and infrared image signal components equal to or smaller than the threshold value are extracted by comparing the calculated threshold value and infrared image signal components. Visible light image signal components corresponding to the extracted infrared image signal components are interpolated using surrounding visible light image signal components. |
申请公布号 |
US7724951(B2) |
申请公布日期 |
2010.05.25 |
申请号 |
US20070733098 |
申请日期 |
2007.04.09 |
申请人 |
CANON KABUSHIKI KAISHA |
发明人 |
TAKAYAMA TSUTOMU;HANABUSA MITSUGU;KASHIWAZAKI ATSUKO;KINUMURA KENGO |
分类号 |
G06K9/00;G06T1/00;G06K9/40;G06T5/00;H04N1/00;H04N1/19;H04N1/40;H04N1/409 |
主分类号 |
G06K9/00 |
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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