Electronic device and focus adjustment method thereof

A focus adjustment method for use in an electronic device, the electronic device comprising an image sensor unit comprising at least one lens module, a pre-processing unit coupled with the image sensor unit and an image processing unit coupled with the image sensor unit and the pre-processing unit, the focus adjustment method comprising the following steps of:

• (a) capturing a plurality of image frames with different scenes in response to movement of the electronic device by the image sensor unit;
• (b) processing the image frames to provide focus information of the image frames by the pre-processing unit;
• (c) analyzing scene change among the image frames to determine a focus change condition of the image frames by the image processing unit;
• and
• (d) determining whether focus of one of the image frames needs to be adjusted according to the focus change condition by the image processing unit and starting to adjust the focus by adjusting the lens module by the image processing unit according to the focus information when the focus change condition is determined to be satisfied.

A focus adjustment method for use in an electronic device, the focus adjustment method comprising the following steps of:

• (a) capturing a plurality of image frames with different scenes in response to movement of the electronic device by an image sensor unit;
• (a1) analyzing scene change among the image frames to determine a focus change condition of the image frames by an image processing unit;
• (b) determining a focus state and a sharpness value of one of the image frames by a pre-processing unit;
• and
• (c) determining whether focus of the image frame needs to be adjusted according to the focus change condition by the image processing unit and starting to adjust the focus by adjusting an adjustment position of a lens module of the image sensor unit by the image processing unit according to the focus state and the sharpness value.