초록 ▼

An image pickup apparatus that is capable of performing a focusing control with sufficient accuracy without restricting a settable range of a focus detection area. An image pickup device has pixels each of which has sub-pixels that receive light beams passing through different pupil areas. A correla

An image pickup apparatus that is capable of performing a focusing control with sufficient accuracy without restricting a settable range of a focus detection area. An image pickup device has pixels each of which has sub-pixels that receive light beams passing through different pupil areas. A correlation operation area including a focus detection area and a shift area is set in an image indicated by an output from the image pickup device. A defocus amount is calculated in response to a correlation amount found by applying a shift process to image signals from the sub-pixels. If the focus detection area is set at a position where the correlation operation area is set with a default width, the shift area is set with a predetermined width. Otherwise the shift area is set with a narrower width and the correlation operation area is set with a width narrower than the default width.

대표청구항 ▼

1. An image pickup apparatus comprising: an image pickup device on which pixels each of which is provided with a plurality of sub-pixels that respectively receive light beams passing through different pupil areas of an imaging optical system are arranged;at least one processor or circuit configured

1. An image pickup apparatus comprising: an image pickup device on which pixels each of which is provided with a plurality of sub-pixels that respectively receive light beams passing through different pupil areas of an imaging optical system are arranged;at least one processor or circuit configured to perform the operations of the following units:an area setting unit configured to set a target area for detecting a defocus amount as a focus detection area in an image indicated by an image signal output from said image pickup device, to set at least one shift area for calculating a correlation amount of image signals output from the plurality of sub-pixels, and to define a correlation operation area including the focus detection area and the at least one shift area;a focus detection unit configured to find, in the correlation operation area, the correlation amount by applying a shift process to image signals output from the plurality of sub-pixels, and to calculate the defocus amount in response to the correlation amount concerned; anda control unit configured to set the width of the at least one shift area to a predetermined width when the focus detection area is set at a position where the correlation operation area can be set with a first width in the image, and to set the width of the at least one shift area to a width narrower than the predetermined width to set the width of the correlation operation area to a second width narrower than the first width when the focus detection area is set at a position where the correlation operation area cannot be set with the first width. 2. The image pickup apparatus according to claim 1, wherein said control unit reduces both of the width of the focus detection area and the width of the at least one shift area to set the width of the correlation operation area to the second width when the focus detection area is set at a position where the correlation operation area cannot be set with the first width. 3. The image pickup apparatus according to claim 1, wherein said area setting unit sets the focus detection area according to a size and a position of a subject when a subject tracking mode for tracking a subject is set, and wherein said control unit sets the correlation operation area with the first width when the correlation operation area can be set with the first width. 4. The image pickup apparatus according to claim 3, wherein said control unit determines whether the size of the subject is larger than a predetermined threshold, and sets the correlation operation area with the first width when the size of the subject is larger than the predetermined threshold. 5. The image pickup apparatus according to claim 4, wherein said control unit sets the correlation operation area with the second width when the size of the subject is not larger than the predetermined threshold. 6. The image pickup apparatus according to claim 3, wherein said control unit sets, when the subject tracking mode is not set, the focus detection area at a predetermined position and sets the correlation operation area with the first width. 7. A control method for an image pickup apparatus having an image pickup device on which pixels each of which is provided with a plurality of sub-pixels that respectively receive light beams passing through different pupil areas of an imaging optical system are arranged, and detecting a focusing state based on an output of the image pickup device, the control method comprising: an area setting step of setting a target area for detecting a defocus amount as a focus detection area in an image indicated by an image signal from said image pickup device, of setting at least one shift area for calculating a correlation amount of image signals output from the plurality of sub-pixels, and of defining a correlation operation area including the focus detection area and the at least one shift area;a focus detection step of finding, in the correlation operation area, the correlation amount by applying a shift process to image signals output from the plurality of sub-pixels, and calculating the defocus amount in response to the correlation amount concerned; anda control step of setting the width of the at least one shift area to a predetermined width when the focus detection area is set at a position where the correlation operation area can be set with a first width in the image, and of setting the width of the at least one shift area to a width narrower than the predetermined width to set the width of the correlation operation area to a second width narrower than the first width when the focus detection area is set at a position where the correlation operation area cannot be set with the first width. 8. A non-transitory computer-readable storage medium storing a control program causing a computer to execute a control method for an image pickup apparatus having an image pickup device on which pixels each of which is provided with a plurality of sub-pixels that respectively receive light beams passing through different pupil areas of an imaging optical system, and detecting a focusing state based on an output of the image pickup device, the control method comprising: an area setting step of setting a target area for detecting a defocus amount as a focus detection area in an image indicated by an image signal from said image pickup device, of setting at least one shift area for calculating a correlation amount of image signals output from the plurality of sub-pixels, and of defining a correlation operation area including the focus detection area and the at least one shift area;a focus detection step of finding, in the correlation operation area, the correlation amount by applying a shift process to image signals output from the plurality of sub-pixels, and calculating the defocus amount in response to the correlation amount concerned; anda control step of setting the width of the at least one shift area to a predetermined width when the focus detection area is set at a position where the correlation operation area can be set with a first width in the image, and of setting the width of the at least one shift area to a width narrower than the predetermined width to set the width of the correlation operation area to a second width narrower than the first width when the focus detection area is set at a position where the correlation operation area cannot be set with the first width. 9. An image pickup apparatus comprising: an image pickup device on which pixels each of which is provided with a plurality of sub-pixels that respectively receive light beams passing through different pupil areas of an imaging optical system are arranged;at least one processor or circuit configured to perform the operations of the following units:an area setting unit configured to set a target area for detecting a defocus amount as a focus detection area in an image indicated by an image signal output from said image pickup device, to set at least one shift area for calculating a correlation amount of image signals output from the plurality of sub-pixels, and to define a correlation operation area including the focus detection area and the at least one shift area;a focus detection unit configured to find, in the correlation operation area, the correlation amount by applying a shift process to image signals output from the plurality of sub-pixels, and to calculate the defocus amount in response to the correlation amount concerned; anda control unit configured to set, when the focus detection area set according to a tracked subject reaches an edge of a settable range of the focus detection area set in an image pickup area, the width of the focus detection area so that the width of the focus detection area is narrower than that of before the reaching of the edge of the settable range of the focus detection area. 10. A control method for an image pickup apparatus having an image pickup device on which pixels each of which is provided with a plurality of sub-pixels that respectively receive light beams passing through different pupil areas of an imaging optical system are arranged, the control method comprising: an area setting step of setting a target area for detecting a defocus amount as a focus detection area in an image indicated by an image signal output from said image pickup device, of setting at least one shift area for calculating a correlation amount of image signals output from the plurality of sub-pixels, and of defining a correlation operation area including the focus detection area and the at least one shift area;a focus detection step of finding, in the correlation operation area, the correlation amount by applying a shift process to image signals output from the plurality of sub- pixels, and calculating the defocus amount in response to the correlation amount concerned; anda control step of setting, when the focus detection area set according to a tracked subject reaches an edge of a settable range of the focus detection area set in an image pickup area, the width of the focus detection area so that the width of the focus detection area is narrower than that of before the reaching of the edge of the settable range of the focus detection area. 11. A non-transitory computer-readable storage medium storing a control program causing a computer to execute a control method for an image pickup apparatus having an image pickup device on which pixels each of which is provided with a plurality of sub-pixels that respectively receive light beams passing through different pupil areas of an imaging optical system are arranged, the control method comprising: an area setting step of setting a target area for detecting a defocus amount as a focus detection area in an image indicated by an image signal output from said image pickup device, of setting at least one shift area for calculating a correlation amount of image signals output from the plurality of sub-pixels, and of defining a correlation operation area including the focus detection area and the at least one shift area;a focus detection step of finding, in the correlation operation area, the correlation amount by applying a shift process to image signals output from the plurality of sub- pixels, and calculating the defocus amount in response to the correlation amount concerned; anda control step of setting, when the focus detection area set according to a tracked subject reaches an edge of a settable range of the focus detection area set in an image pickup area, the width of the focus detection area so that the width of the focus detection area is narrower than that of before the reaching of the edge of the settable range of the focus detection area.