Covariance focus sensor
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United States of America Patent
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Jan 6, 1998
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N/A
app pub date -
Jul 23, 1996
filing date -
Jul 23, 1996
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Abstract
A focus sensor for detecting the focus state of an image forming optical system relative to an object, the optical system having a plane of best imaging focus, includes: a plurality of image detectors located at a corresponding plurality of positions relative to the plane of best imaging focus for producing a respective plurality of image signals; and a signal processor connected to the image detectors for determining a position of best focus by calculating the covariances between respective pairs of the image signals.
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