Automatic focusing by a camera involves actively scanning possible lens positions and choosing one that provides the sharpest image. Triggering too frequently can result in image frames captured during the process leading to an out-of-focus image. On the other hand, triggering less often can also lead to an out-of-focus image due to changes in the scene being captured that occur after automatic focus was locked. Scene changes due to hand shaking or camera motion are typically not taken into account by the automatic focusing process. As a result, any such changes that occur after locking focus can result in an out-of-focus image.
This disclosure describes techniques that take into account camera motion during the automatic focusing procedures. The techniques involve analyzing camera motion to estimate if it can result in a change that requires refocusing by triggering the automatic focus process. If so, the automatic focus process is triggered to adjust the previously locked focus.
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Yang, Ruiduo, "Stable auto focus re-triggering with hand shake motion compensation", Technical Disclosure Commons, (February 13, 2019)