| 摘要 |
An automatic focusing apparatus includes a position detecting unit for a focus unit, a driving unit for the focus unit, a focus detecting unit using a phase difference method, a contrast acquiring unit for picking up an image of object, and a focusing determining unit based on a contrast, a cyclic pattern determining unit for an object based on focus information obtained by the focusing detecting unit, a target position setting unit for driving of the focus unit, and a focusing direction determining unit, and, when the object has a cyclic pattern, the apparatus determines a direction of an in-focus point, sets a target position in the determined direction of the in-focus point, drives the focus unit toward the target position, and determines whether or not in-focus state is achieved by using the focusing determining unit. |
| 主权项 |
1. An automatic focusing apparatus, comprising:
an image pickup optical system including a focus lens unit; a focus position detecting unit for detecting a position of the focus lens unit; a focus driving unit for driving the focus lens unit; an image pickup unit for picking up an image of an object through use of a beam having passed through the image pickup optical system; a focus detecting unit for detecting focus information by a phase difference method through use of the beam from the object; a contrast acquiring unit for acquiring a contrast evaluating value using an image pickup signal obtained by the image pickup unit; a focusing determining unit for determining whether or not an in-focus state is achieved based on the contrast evaluating value; a cyclic pattern determining unit for determining whether or not the object has a cyclic pattern based on the focus information provided by the focusing detecting unit; a target position setting unit for setting a target position for driving of the focus lens unit; and a focusing direction determining unit for determining a direction of an in-focus point, wherein, when the cyclic pattern determining unit determines that the object has the cyclic pattern, the focusing direction determining unit determines the direction of the in-focus point, the target position setting unit sets the target position of the focus lens unit in the direction of the in-focus point, the focus driving unit drives the focus lens unit toward the target position, and the focusing determining unit determines whether or not an in-focus state is achieved. |
