Image pickup apparatus having improved contrast autofocus accuracy
AssigneeCanon Kabushiki Kaisha
InventorKoji Inoue
Life of this patent
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Abstract
An image pickup apparatus includes an image pickup device that includes a plurality of focus detection pixels, a phase difference detection type of a first focus detector, a contrast detection type of a second focus detector, and a controller. The controller is configured to allow the second focus detector to continue the focus detection when the shift amount detected by the first focus detector is larger than a threshold even when the second focus detector detects the lens position corresponding to the peak of the contrast value, and to move the image pickup lens to a lens position that provides a peak of a contrast value detected by the second focus detector when the shift amount is the threshold or smaller.
Claims4
An image pickup apparatus comprising:
- an image pickup device that includes a plurality of image pickup pixels configured to receive light that has passed an exit pupil of an image pickup lens and to generate an image of an object, and a plurality of focus detection pixels each configured to receive light that has passed a part of an area of the exit pupil of the image pickup lens in a focus detection region;
- a first focus detector configured to detect a focus by detecting a shift amount between a pair of images of the object formed by the plurality of focus detection pixels;
- a second focus detector configured to detect a focus by detecting a peak position of a contrast value of an image of the object formed by the plurality of image pickup pixels;
- and
- a controller configured to control the second focus detector to continue to detect the focus when the shift amount detected by the first focus detector is larger than a threshold even when the second focus detector detects a peak position of the contrast value, and to move the image pickup lens to a lens position corresponding to a peak position of the contrast value detected by the second focus detector when the shift amount is the threshold or smaller.
A control method of an image pickup apparatus comprising:
- a first focus detection step of detecting a focus by detecting a shift amount between a pair of images of an object formed by a plurality of focus detection pixels each configured to receive light that has passed a part of an area of an exit pupil of an image pickup lens;
- and
- a second focus detection step of detecting a focus by detecting a focus by detecting a peak position of a contrast value of an image of the object formed by a plurality of image pickup pixels each configured to receive light that has passed the exit pupil of the image pickup lens and to generate an image of the object,
- wherein the second focus detection step is controlled to continue a focus detection when the shift amount detected in the first focus step is larger than a threshold in the first focus detection step even when a peak position of the contrast value is detected, and to move the image pickup lens to a lens position corresponding to a peak position of the contrast value detected by the second focus detection step when the shift amount is the threshold or smaller.
Dependencies are inferred from the claim text.