Method of real-time auto focus
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United States of America Patent
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Issued Date -
Mar 6, 2008
app pub date -
Aug 30, 2006
filing date -
Aug 30, 2006
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A method of real-time auto focus includes: (a) judging whether a focus environment is changed by a focus environment judgment unit of a real-time auto focus system; (b) if the focus environment has been changed, figuring out a contrast value by a frame that is captured via a sensor of the real-time auto focus system; (c) judging whether the contrast value is larger than last contrast value by comparing the contrast value with last contrast value; (d) if the contrast value is larger than last contrast value, letting a lens move along one direction, and then if the contrast value is not larger than last contrast value, letting a lens move along the other direction; and (e) repeating the cycle of the step (b)-(d) until the total number of the cycle time reaches the predetermined total cycle time.
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