发明名称 |
Device for determining focused state of taking lens |
摘要 |
In a focusing state determining device for determining a focusing state of a taking lens, an object light entering the taking lens is captured by focusing state determination imaging elements provided separately from a video imaging element, and the focusing state is determined according to luminance signals outputted from the focusing state determination imaging elements. Any error of determination of the focusing state induced by saturation of the luminance signals in imaging an object of high luminance is prevented by adjusting the gains of the image signals outputted from the focusing state determination imaging elements or the charge accumulation times of the focusing state determination imaging elements. High-frequency components are determined from the luminance signals obtained from the focusing state determination imaging elements (A, B, C), and the focus evaluation value is determined by integration thereof. An automatic gain control circuit (82) adjusts the gains of the luminance signals so that the maximum levels of the luminance signals may not reach the saturation levels.
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申请公布号 |
US2004149882(A1) |
申请公布日期 |
2004.08.05 |
申请号 |
US20030479757 |
申请日期 |
2003.12.04 |
申请人 |
SASAKI TADASHI;WADA MASAO;INOUE TETSUJI;KUMAKI RYOJI;NAKAMURA SHINOBU;TOMINAGA HARUO;HORIGUCHI HIROYUKI;SUGIURA HIDEAKI;SUGAWARA MASAYUKI |
发明人 |
SASAKI TADASHI;WADA MASAO;INOUE TETSUJI;KUMAKI RYOJI;NAKAMURA SHINOBU;TOMINAGA HARUO;HORIGUCHI HIROYUKI;SUGIURA HIDEAKI;SUGAWARA MASAYUKI |
分类号 |
G03B13/36;G02B7/28;G02B7/36;H04N5/232;(IPC1-7):G02B7/04 |
主分类号 |
G03B13/36 |
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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