Imaging device and focusing control method
AssigneeFUJIFILM Corporation
InventorTakashi AOKI
Life of this patent
Estimating the term…
Abstract
An imaging element with rolling shutter drive has pixels that each receive one or the other of a pair of light bundles passing through an aperture area for an imaging lens. The pixels are disposed on a first line arranged in the X direction, and the pixels are disposed on a second line in the X direction, alternating in the Y direction. A control unit uses a signal group from the pixels on a line in FIG. 2, a signal group from the pixels on a line, and a signal group from pixels on a line to control imaging lens focus on the basis of the phase difference information found from the amount of phase difference between the signal groups and the amount of phase difference between the signal groups.
Claims10
An imaging device comprising:
- a solid-state image-capture element comprising a first line on which first phase difference detection pixels, each of which receiving one of a pair of light bundles passing through aperture areas of an imaging optical system located at different positions, are arranged in a phase difference detection direction and a second line on which second phase difference detection pixels, each of which receiving the other of the pair of light bundles, are arranged in the phase difference detection direction, the first line and the two second lines being alternately arranged in a direction orthogonal to the phase difference detection direction;
- an image-capture element driving unit that reads out a signal from the solid-state image-capture element by a rolling shutter method;
- a phase difference information calculation unit that calculates a first phase difference amount between a first signal group, which is read out from the first phase difference detection pixels of the first line, and a second signal group, which is read out from the second phase difference detection pixels on the second line from which signals are read out later than the first line and which is parallel with a rear stage of the first line and a second phase difference amount between the second signal group and a third signal group, which is read out from the first phase difference detection pixels on the first line from which signals are read out later than the second line and which is parallel with a rear stage of the second line by using the first signal group, the second signal group and the third signal group and calculates phase difference information by a calculation using the first phase difference amount and the second phase difference amount, and
- a focusing control unit that controls a focus of the imaging optical system on the basis of the phase difference information calculated by the phase difference information calculation unit.
A focusing control method in an imaging device comprising a solid-state image-capture element that comprises a first line on which first phase difference detection pixels, each of which receiving one of a pair of light bundles passing through aperture areas of an imaging optical system located at different positions, are arranged in a phase difference detection direction and a second line on which second phase difference detection pixels, each of which receiving the other of the pair of light bundles, are arranged in the phase difference detection direction, the first line and the two second lines being alternately arranged in a direction orthogonal to the phase difference detection direction, the focusing control method comprising steps of:
- reading out a signal from the solid-state image-capture element by a rolling shutter method;
- calculating a first phase difference amount between a first signal group, which is read out from the first phase difference detection pixels of the first line, and a second signal group, which is read out from the second phase difference detection pixels on the second line from which signals are read out later than the first line and which is parallel with a rear stage of the first line and a second phase difference amount between the second signal group and a third signal group, which is read out from the first phase difference detection pixels on the first line from which signals are read out later than the second line and which is parallel with a rear stage of the second line by using the first signal group, the second signal group and the third signal group and calculating phase difference information by a calculation using the first phase difference amount and the second phase difference amount, and
- controlling a focus of the imaging optical system on the basis of the calculated phase difference information.
Dependencies are inferred from the claim text.