Focus-point selection system, autofocus system, and camera

摘要

A focus-point selection system comprising an image sensor, a target detector, a location detector, and a first selector is provided. The focus-point selection system selects a subset of focus points corresponding to the location of a target in an image capturing area from a plurality of focus points positioned at predetermined locations. The target is a subject that is brought into focus according to a phase-difference autofocus method. The image sensor generates an image signal corresponding to the captured optical image. The target detector detects the target on the basis of the image signal. The location detector detects a subject location. The subject location is a location of the target detected by the target detector in the image capturing area. The first selector selects the focus point with the shortest distance from the subject location.