发明名称 |
Video camera apparatus and automatic focusing circuit |
摘要 |
An automatic focusing circuit comprises: a lens section including a focusing lens; photoelectric converting means for photoelectrically converting an amount of light which passed through the lens section; a first filter having first frequency characteristics to extract a first high frequency component from a luminance signal; a second filter which is used to extract a second high frequency component from said luminance signal and which has frequency characteristics steeper than those of the first filter; optical black level detecting means for detecting an optical black level of an image pickup signal; and a control section to control the focusing lens on the basis of the optical black level and the first and second high frequency components.
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申请公布号 |
US5638122(A) |
申请公布日期 |
1997.06.10 |
申请号 |
US19960651853 |
申请日期 |
1996.05.09 |
申请人 |
SONY CORPORATION |
发明人 |
KAWAGUCHI, NAOKI;TORII, REIKO |
分类号 |
H04N5/232;G02B7/28;G02B7/36;(IPC1-7):H04N5/232 |
主分类号 |
H04N5/232 |
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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