Auto focus system and auto focus method
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United States of America Patent
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Feb 12, 2013
Grant Date -
Aug 18, 2011
app pub date -
Feb 18, 2010
filing date -
Feb 18, 2010
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Abstract
An auto focus method for passive auto focus systems consists of an image acquisition and processing engine, as well as an acutance index calculation engine. An auto focus method measures image's acutance index rather than image's contrast value. A passive auto focus system employing the auto focus method of the present invention can accurately and reliably detect the best focus point and thus preventing auto focus malfunction even under the condition that illumination uniformity changes dramatically.
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