Apparatus, method, and manufacture for iterative auto-focus using depth-from-defocus
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United States of America Patent
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Jul 10, 2012
Grant Date -
Mar 4, 2010
app pub date -
Mar 23, 2009
filing date -
Sep 4, 2008
priority date (Note) -
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status (Latency Note)
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Abstract
A camera with auto-focusing performs multiple iterations in which the distance from the camera to an object is estimated for the purpose of auto-focusing the camera. Each estimate is made using depth-from-defocus with at least two images used to make the estimate. When the two images are taken, the camera parameters are different. For example, the focus position, aperture, or zoom may be different between the two images. In each subsequent iteration, the previous estimate of distance from the camera to the object is used so that the parameter varied (focus position or zoom) is closer to that corresponding to the estimated distance from the camera to the object, so that the estimated distance is closer to the actual distance in each iteration.
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