公开(公告)号：US20130321693A1

公开(公告)日：2013-12-05

申请号：US13656831

申请日：2012-10-22

Applicant: KUO-HUNG LIN

Inventor： KUO-HUNG LIN

IPC: H04N5/232

CPC classification number: H04N5/23212 ,  G03B13/36

Abstract: An auto-focus method controls a motor to drive an optical lens of a lens module to a focus point and includes steps of: describing a first parabola according to three coordinate points in a coordinate system; describing a second parabola according to a first highest point of the first parabola and two coordinate points selected from the three coordinate points in the coordinate system, wherein the resolution values of two selected coordinate points are greater than that of unselected coordinate point; comparing a difference between the electric current value of a second highest point of the second parabola and the electric current value of the first highest point with a preset value; wherein when the difference is less than the preset value, the second highest point is regarded as the focus point.

Abstract translation: 自动对焦方法控制电动机将透镜模块的光学透镜驱动到对焦点，并且包括以下步骤：根据坐标系中的三个坐标点描述第一抛物线; 描述根据第一抛物线的第一高点和从坐标系中的三个坐标点中选择的两个坐标点的第二抛物线，其中两个所选坐标点的分辨率值大于未选择的坐标点的分辨率值; 将第二抛物线的第二最高点的电流值与第一最高点的电流值之间的差与预设值进行比较; 其中当所述差小于所述预设值时，所述第二最高点被认为是所述焦点。