Patent ID: 9479691
Filing Date: 2016-10-25
CPC Classification: G02B,G03B,H04N

Claim Text:
1. An image capture device that has an imaging element that images a subject through an imaging optical system, the imaging element including a first signal detection unit that detects a signal based on one beam among a pair of beams that passes through different portions in a pupil region of the imaging optical system, and a second signal detection unit that detects a signal based on the other beam among the pair of beams, and the image capture device comprising: a focus control unit that performs a focus control of the imaging optical system using a phase difference AF method that uses detection signals of the first signal detection unit and the second signal detection unit; a matching rate generation unit that generates a first matching rate which is a matching rate of two images captured by a first pair of a first signal detection unit group including the plurality of first signal detection units arranged along a phase difference detection direction in the first signal detection unit and the second signal detection unit and a signal detection unit group including the second signal detection units arranged at the same distance in the same direction with respect to the respective signal detection units of the first signal detection unit group, using detection signals of the respective signal detection units of the first pair, generates a second matching rate which is a matching rate of two images captured by a second pair of a second signal detection unit group including the plurality of first signal detection units arranged at the same distance in the same direction with respect to the respective signal detection units of the first signal detection unit group and arranged along the detection direction and a signal detection unit group including the second signal detection units arranged at the same distance in the same direction with respect to the respective signal detection units of the second signal detection unit group, using detection signals of the respective signal detection units of the second pair, generates a third matching rate which is a matching rate of two images captured by a third pair which is a pair in which the second signal detection unit that forms a pair together with the first signal detection unit in the first pair is changed to form a combination different from that of the pair for calculating the first matching rate, using detection signals of the respective signal detection units of the third pair, and generates a fourth matching rate which is a matching rate of two images captured by a fourth pair which is a pair in which the second signal detection unit that forms a pair together with the first signal detection unit in the second pair is changed to form a combination different from that of the pair for calculating the second matching rate, using detection signals of the respective signal detection units of the fourth pair; and a reliability determination unit that determines reliability of the focus control based on the phase difference AF method that uses the detection signals of the respective signal detection units of each of the first pair, the second pair, the third pair, and the fourth pair based on the first matching rate, the second matching rate, the third matching rate, and the fourth matching rate.