发明名称 |
Automatic focusing apparatus for automatically matching focus in response to video signal |
摘要 |
An automatic focusing apparatus of a video camera automatically matches a focus in response to a video signal obtained from an image sensing circuit. The automatic focusing apparatus detects the level of a high frequency component of the video signal in order to supply a focus evaluating value which takes a maximum value in an in-focus position. A focusing motor controlling circuit performs an automatic focusing operation by a hill-climbing servo system based on the supplied focus evaluating value. A determination is made by employing a fuzzy inference with respect to the initialization of the direction of movement of a lens when the automatic focusing operation starts, the selection of a focusing area from a plurality of areas, and the reactivation of the automatic focusing operation due to a change of an object once the automatic focusing operation is completed.
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申请公布号 |
US5361095(A) |
申请公布日期 |
1994.11.01 |
申请号 |
US19930173998 |
申请日期 |
1993.12.28 |
申请人 |
SANYO ELECTRIC CO., LTD. |
发明人 |
TOSHINOBU, HARUKI;KENICHI, KIKUCHI |
分类号 |
H04N5/232;(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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