Patent ID: 9088707
Filing Date: 2015-07-21
Classification: B41J,H04N

Abstract:
1. A focus control device comprising: an image acquisition section that acquires a captured image that has been captured by an imaging optical system; an evaluation value calculation section that calculates a focus evaluation value based on the captured image, the focus evaluation value being used to evaluate an in-focus state of an object in the captured image; a determination information calculation section that calculates determination information based on the focus evaluation value; a determination section that determines whether to start or stop an autofocus control process based on the determination information; and a focus control section that starts or stops the autofocus control process based on a determination result of the determination section; wherein: the evaluation value calculation section calculates a contrast value within a given area of the captured image as the focus evaluation value, the determination information calculation section calculates a change in contrast that indicates a temporal change in the contrast value as the determination information, and the focus control section starts the autofocus control process when it has been determined that the change in contrast satisfies a start condition, and stops the autofocus control process when it has been determined that the change in contrast satisfies a stop condition.