发明名称 |
Clamping device and clamping method |
摘要 |
An optical black portion in an output of a CCD image pickup device is extracted and a clamp level of each line is obtained by an integrating and averaging circuit. A difference value of the clamp levels between the front and rear lines and an absolute value of the difference are calculated by a comparing circuit. Either the clamp level of each line or the clamp level updated every (+1) or (-1) is selected by a selector in accordance with whether the absolute value of the difference of the clamp levels between the front and rear lines lies within a predetermined range or not. The clamp level which is outputted from the selector is subtracted from the output of the CCD image pickup device.
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申请公布号 |
US6700609(B1) |
申请公布日期 |
2004.03.02 |
申请号 |
US20000600456 |
申请日期 |
2000.07.17 |
申请人 |
SONY CORPORATION |
发明人 |
ABE MIKI |
分类号 |
H04N5/18;H04N5/335;H04N5/361;H04N5/365;H04N5/369;H04N5/372;H04N5/378;H04N9/07;(IPC1-7):H04N9/64;H04N5/217;H04N5/228;H04N1/40 |
主分类号 |
H04N5/18 |
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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