IMAGING APPARATUS, FOCUS POSITION DETECTION APPARATUS, AND FOCUS POSITION DETECTION METHOD

摘要

A focus position detection apparatus calculates, for each shift amount calculation area in a measurement area set on an image sensor of a camera, a local shift amount between a first sub-image generated by first pixels and a second sub-image generated by second pixels, and a degree of reliability of the local shift amount, and corrects the degree of reliability base on a level of inclusion of components included in a subject image in the shift amount calculation area and being finer than a distance between two adjacent first pixels or a distance between two adjacent second pixels. The focus position detection apparatus then calculates a representative value representing a distance between a focus position by an optical system of the camera and the image sensor so that influence of the local shift amount of each shift amount calculation area increases as the corrected degree of reliability increases.

主权项

1. An imaging apparatus comprising:
a camera which includes an image sensor in which phase difference detectors detecting a phase difference to be used for calculating a focus position by using an image surface phase difference detection method, are disposed at a plurality of locations in a light receiving surface, and captures an image of a subject by using a light incident on the light receiving surface of the image sensor via an optical system with a movable focal point position; and a processor configured to calculate, when a frequency value calculated by using a pixel value located between a first phase difference detector and a second phase difference detector among a plurality of the phase difference detectors is larger than or equal to a predetermined value, the focus position based on phase differences detected by a plurality of the phase difference detectors with reduced contribution of a phase difference by the first phase difference detector and the second phase difference detector.