Patent ID: 7536095

Claim:
An autofocus device comprising: a lens-driving unit that drives a lens; a focal-point-position-detecting unit that detects a position of a focal point of the lens; a focus-evaluation-value-calculating unit that calculates a focus evaluation value using a frequency component of an image signal in a particular region that is provided in an imaging frame, wherein the paiteular region is one of a plurality of image regions of different sizes, a center of each image region aligning a center of the imaging frame; a user interface that sets an autofocus content; and a control unit that performs a focus operation to control the lens-driving unit to drive the lens based on any of the focus evaluation value and the focus evaluation value and the position of a focal point of the lens, thereby meeting the position of the focal point of the lens detected by the focal-point-detecting unit to an in-focus position thereof, wherein the control unit controls the lens-driving unit and the focus-evaluation-value-calculating unit based on the autofocus content set by the user interface, thereby achieving a focus operation according to the set content.