Focus adjustment apparatus and image capturing apparatus
AssigneeCanon Kabushiki Kaisha
InventorYuichiro Yamashita
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Abstract
A focus adjustment apparatus for performing focus adjustment using a captured image and a plurality of point spread functions prepared in advance for each defocus direction and defocus amount is provided. The apparatus includes a focus adjusting stop whose aperture does not have rotational symmetry about an optical axis. Focus adjustment is performed by comparing the plurality of point spread functions prepared in advance with a point spread function of an image captured using the focus adjusting stop and not having rotational symmetry about the optical axis, obtaining the defocus direction and the defocus amount, and performing the focus adjustment according to the obtained defocus direction and defocus amount.
Claims4
A focus adjustment apparatus for performing focus adjustment using a captured image and a plurality of point spread functions prepared in advance for each defocus direction and defocus amount, comprising
- a focus adjusting stop whose aperture does not have rotational symmetry about an optical axis,
- wherein focus adjustment is performed by comparing the plurality of point spread functions prepared in advance with a point spread function of an image captured using the focus adjusting stop and not having rotational symmetry about the optical axis, obtaining the defocus direction and the defocus amount, and performing the focus adjustment according to the obtained defocus direction and defocus amount.
Dependencies are inferred from the claim text.