发明名称 |
Image reading device |
摘要 |
An image reading device has a charge-coupling image sensor, a white reference plate with uniform density of tone, a tone correction data memory, a logarithmic convertor for analog or for digital signals and a tone correction circuit. The tone correction can be carried out by means of a simple circuit and only requires a low-capacity memory.
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申请公布号 |
DE3527301(A1) |
申请公布日期 |
1986.02.13 |
申请号 |
DE19853527301 |
申请日期 |
1985.07.30 |
申请人 |
CANON K.K. |
发明人 |
MITA,YOSHINOBU;KAWAMURA,NAOTO;YOSHIDA,TADASHI;DEI,KATSUHITO |
分类号 |
H04N1/401;(IPC1-7):H04N1/38;H04N1/40 |
主分类号 |
H04N1/401 |
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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