Automatic focusing apparatus for automatically matching focus in

Details Automatic focusing apparatus for automatically matching focus in Automatic focusing apparatus for automatically matching focus in

1993-01-29

1994-11-29

Powell, Mark R.

Television

Camera, system and detail

Optics

348254, 348349, 348356, H04N 5232, H04N 5202

Patent

active

053694368

ABSTRACT:
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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patent: 5079622 (1992-01-01), Toshinobu

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