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Automatic focusing apparatus for automatically matching focus in response to video signal based on extracted high frequency component of non-linear processed luminance signal
Automatic focusing apparatus for automatically matching focus in response to video signal based on extracted high frequency component of non-linear processed luminance signal
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机译:基于提取的非线性处理后的亮度信号的高频成分,根据视频信号自动匹配焦点的自动聚焦装置
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摘要
The present invention relates to an automatic focusing apparatus which permits an automatic focusing operation to occur with a high accuracy irrespective of the luminance of an object being sensed. The automatic focusing apparatus includes a focus lens, an image sensor, a focus motor for changing the position of the focus lens, a Y/C separating circuit for separating a luminance signal Y from the output of the image sensor, a non-linear circuit for subjecting the separated luminance signal Y to a non-linear processing, a high pass filter (HPE) extracting a high frequency component from the output of the non-linear circuit, an integrating circuit for integrating the extracted high frequency component and an in-focus detecting circuit for controlling the position of the focus lens based on the result of integration.
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