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Automatic focusing apparatus for automatically adjusting focus in response to video signal by fuzzy inference
Automatic focusing apparatus for automatically adjusting focus in response to video signal by fuzzy inference
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机译:自动聚焦装置,用于通过模糊推理响应视频信号自动调节聚焦
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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 after once the automatic focusing operation is completed.
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