Image device and focus control method
AssigneeFUJIFILM Corporation
InventorTakashi Aoki
Life of this patent
Estimating the term…
Abstract
When reliability of a defocus amount which is calculated using a signal from a region 50A is low, a digital camera expands the phase difference detection target region to the regions 50A, 50B, and 50C. Further, the digital camera calculates a defocus amount using a correlation operation result of an output signal group of pixel cells 31R in an odd numbered column and an output signal group of the pixel cells 31L in an odd numbered column and a correlation operation result of an output signal group of pixel cells 31R in an even numbered column and an output signal group of the pixel cells 31L in an even numbered column, in the regions 50A, 50B, and 50C.
Claims9
An imaging device, comprising:
- an imaging element that has a plurality of pairs of first pixel cells and second pixel cells receiving a pair of light fluxes passing through different pupil regions of an photographing optical system and outputting signals according to a light amount;
- a first defocus amount calculating unit that calculates a defocus amount using a narrow range signal group obtained from the plurality of pairs in a first range;
- a second defocus amount calculating unit that calculates a defocus amount using a broad range signal group obtained from all the pairs in a second range which includes the first range and is broader than the first range;
- and
- a focus control unit that controls a focus state of the imaging optical system based on the defocus amount calculated by the first defocus amount calculating unit and the defocus amount calculated by the second defocus amount calculating unit,
- wherein the second defocus amount calculating unit generates a broad pitch signal group having an arrangement pitch being larger than an arrangement pitch of the narrow range signal groups using the broad range signal group and calculates the defocus amount using the broad pitch signal group.
A focus control method of an imaging device including an imaging element that has a plurality of pairs of first pixel cells and second pixel cells receiving a pair of light fluxes passing through different pupil regions of an photographing optical system and outputting signals according to a light amount, the method comprising:
- a first defocus amount calculating step that calculates a defocus amount using a narrow range signal group obtained from the plurality of pairs in a first range;
- a second defocus amount calculating step that calculates a defocus amount using a broad range signal group obtained from all the pairs in a second range which includes the first range and is broader than the first range;
- and
- a focus control step that controls a focus state of the imaging optical system based on the defocus amount calculated by the first defocus amount calculating step and the defocus amount calculated by the second defocus amount calculating step,
- wherein the second defocus amount calculating step generates a broad pitch signal group having an arrangement pitch being larger than an arrangement pitch of the narrow range signal groups using the broad range signal group and calculates the defocus amount using the broad pitch signal group.
Dependencies are inferred from the claim text.