Patent ID: 11889186
Assignee: CANON KABUSHIKI KAISHA
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 18:
19. A focus detection method executed by a focus detection device, the focus detection method comprising:
generating a first focus detection signal and a second focus detection signal based on a signal obtained from an image sensor;
calculating a shift amount between the first focus detection signal and the second focus detection signal;
calculating a conversion coefficient for converting the shift amount into a defocus amount of an imaging optical system; and
detecting the defocus amount by applying the conversion coefficient to the shift amount,
wherein the calculating of the conversion coefficient includes calculating the conversion coefficient based on at least one of a pupil eccentricity amount and an incident pupil distance, and
wherein the pupil eccentricity amount and the incident pupil distance have values based on stored values having different values corresponding to coordinates in two or more of four quadrants of a pixel region of the image sensor.