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Abstract

A blurring parameter operating section calculates a blurring parameter corresponding to a distance from an optical system to a subject, based on two luminance information items which have different blurring degrees and are acquired by changing an arrangement setting of the optical system. A distance estimating section estimates distance information corresponding to the distance from the optical system to the subject, based on the blurring parameter. A focus detection section acquires luminance information after changing arrangement setting of the optical system based on the distance information, acquires luminance information items having different blurring degrees by further changing arrangement setting of the optical system, calculates an evaluation value indicating a degree of focus from each of the luminance information items having the different blurring degrees, and determines the focal position based on the evaluation value.

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First Claim