Patent ID: 7932951
Filing Date: 2011-04-26
Classification: H04N

Abstract:
1. A focus adjustment device that moves a lens in a direction of an optical axis to adjust a focus of the lens, the focus adjustment device comprising: an evaluation unit configured to analyze an image captured via the lens and specify an evaluation value representing a focused state of the lens; a correction value calculation unit configured to capture an image of a specific subject with moving the lens forward and backward, and calculate an evaluation correction value for correcting the evaluation value, based on a difference between a first peak value of the evaluation value detected in a forward motion of the lens and a second peak value of the evaluation value detected in a backward motion of the lens, prior to moving the lens for adjustment of the focus; a focused position detection unit configured to correct the evaluation value with the calculated evaluation correction value according to a moving direction of the lens, and detect a focused position of the lens, based on the corrected evaluation value in moving the lens for adjustment of the focus; and a focusing control unit configured to move the lens to the detected focused position.