Ranging apparatus, imaging apparatus, ranging method and ranging parameter calculation method
AssigneeCanon Kabushiki Kaisha
InventorMakoto Oigawa
Life of this patent
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Abstract
A ranging apparatus includes: a first calculation unit configured to calculate an image shift amount between a first image and a second image, the first image being based on a first signal which corresponds to a light flux transmitted through a first pupil area of an imaging optical system, and the second image being based on a second signal which corresponds to a light flux transmitted through a second pupil area of the imaging optical system; and a second calculation unit configured to calculate a defocus amount from the image shift amount, using a conversion coefficient based on a received light quantity distribution in accordance with the position of the ranging pixel.
Claims11
A ranging apparatus, comprising:
- a first calculation unit configured to calculate an image shift amount between a first image and a second image, the first image being based on a first signal which corresponds to a light flux transmitted through a first pupil area of an imaging optical system, and the second image being based on a second signal which corresponds to a light flux transmitted through a second pupil area of the imaging optical system;
- and
- a second calculation unit configured to calculate a defocus amount from the image shift amount, using a conversion coefficient based on a received light quantity distribution in accordance with the position of the ranging pixel.
A ranging method for a ranging apparatus, comprising:
- a first calculation step of calculating an image shift amount between a first image and a second image, the first image being based on a first signal which corresponds to a light flux transmitted through a first pupil area of an imaging optical system, and the second image being based on a second signal which corresponds to a light flux transmitted through a second pupil area of the imaging optical system;
- and
- a second calculation step of calculating a defocus amount from the image shift amount, using a conversion coefficient based on a received light quantity distribution in accordance with the position of the ranging pixel.
A ranging parameter calculation method used for a ranging apparatus, comprising:
- a step of acquiring a first signal based on a light flux transmitted through a first pupil area of an imaging optical system, and a second signal based on a light flux transmitted through a second pupil area of the imaging optical system;
- a step of calculating a received light quantity distribution in accordance with a position of a ranging pixel, based on at least one of the first signal and the second signal;
- and
- a step of calculating a conversion coefficient for converting an image shift amount into a defocus amount, based on the received light quantity distribution.
Dependencies are inferred from the claim text.