Focusing control device, focusing control method, and program

Abstract

A focusing control device that moves a position of a focus lens included in an imaging lens along an optical axis direction. The device comprises a processor configured to execute a process. The process comprises receiving an input of a captured image obtained by imaging an optical image passed through the imaging lens including the focus lens; performing one processing of first processing that includes deriving a contrast value of an image within a distance measurement area which changes according to the movement of the position of the focus lens for each of a plurality of the distance measurement areas, specifying a peak of the contrast value based on the contrast value for each of the plurality of distance measurement areas, and specifying, as a focusing position, the position of the focus lens corresponding to the specified peak of the contrast value, or second processing that includes specifying the peak of the contrast value based on an added value obtained by adding the contrast values derived from the plurality of distance measurement areas and specifying, as the focusing position, the position of the focus lens corresponding to the specified peak of the contrast value; performing control such that the one processing is switched according to an amount of change of a position of an image of a subject corresponding to a change of an image magnification of the imaging lens, and moving the focus lens to the specified focusing position.