Image capture apparatus and method for controlling the same

1. An image capture apparatus comprising:

an area detection circuit that detects, from an image, a subject area and a characteristic area within the subject area;

a setting circuit that sets an AF area to the characteristic area;

a defocus amount detection circuit that detects a defocus amount for the AF area and defocus amounts for peripheral areas of the AF area;

a correction circuit that corrects the defocus amount detected for the AF area based on the defocus amounts detected for the peripheral areas; and

a focus adjustment circuit that adjusts focus of an imaging optical system based on the defocus amount corrected by the correction circuit.

2. The image capture apparatus according to claim 1 , wherein

the correction circuit

obtains gradients of the defocus amount detected for the AF area and the defocus amounts detected for the peripheral areas of the AF area; and

corrects the defocus amount in a case in which at least one of the gradients is greater than a threshold and does not correct the defocus amount in a case in which none of the gradients is greater than the threshold.

3. The image capture apparatus according to claim 1 , wherein

the correction circuit:

performs the correction in a case in which a size of the AF area is equal to or less than a threshold or a case in which the AF area is located in an edge portion of the subject area; and

does not perform the correction in a case in which the size of the AF area is greater than the threshold or a case in which the AF area is not located in the edge portion of the subject area.

4. The image capture apparatus according to claim 1 , wherein the subject area is a face area and the characteristic area is an eye area.

5. The image capture apparatus according to claim 1 ,

wherein the subject area is a face area and the characteristic area is an eye area; and

the correction circuit:

performs the correction in a case in which the AF area is set is a back eye area, and

does not perform the correction in a case in the AF area is set is a front eye area.

6. The image capture apparatus according to claim 1 , wherein:

the subject area is a face area and the characteristic area is an eye area; the defocus amount detection circuit detects a defocus amount for each of eye areas; and

the correction circuit uses a defocus amount detected for a front eye area among the eye areas to limit the corrected defocus amount of the defocus amount detected for a back eye area among the eye areas.

7. The image capture apparatus according to claim 1 , further comprising:

a determination circuit that determines whether to perform a correction of the defocus amount detected for the AF area, based on the defocus amount for the AF area and the defocus amounts detected for the peripheral areas, and

wherein:

the correction circuit corrects the defocus amount detected for the AF area based on the defocus amounts detected for the peripheral areas, in a case where the determination circuit determines to perform the correction; and

the focus adjustment circuit adjusts focus of an imaging optical system based on the defocus amount corrected by the correction circuit, in a case where the determination circuit determines to perform the correction.

8. The image capture apparatus according to claim 1 , wherein

the correction circuit:

obtains, for each of preset directions, gradients of the defocus amount between the AF area and each of two of the peripheral areas that are adjacent to the AF area in one of the preset directions;

calculates a correction value, for each of the preset directions, based on (i) among the defocus amounts detected for the two peripheral areas, one for which a smaller gradient is obtained, and (ii) the defocus amount detected for the AF area; and

corrects the defocus amount detected for the AF area based on the plurality of correction values calculated for the preset plurality of directions.

9. The image capture apparatus according to claim 8 , wherein

the correction circuit obtains an average value of the plurality of correction values as the corrected defocus amount for the AF area.

10. The image capture apparatus according to claim 8 , wherein

the correction circuit obtains, among the plurality of correction values, one having a smallest difference from the defocus amount detected for the AF area as the corrected defocus amount for the AF area.

11. A method for controlling an image capture apparatus comprising:

detecting, from an image, a subject area and a characteristic area within the subject area;

setting an AF area to the characteristic area;

detecting a defocus amount for the AF area and defocus amounts for peripheral areas of the AF area;

correcting the defocus amount detected for the AF area based on the defocus amounts detected for the peripheral areas; and

adjusting focus of an imaging optical system based on the defocus amount corrected in the correcting.

12. A non-transitory computer-readable medium that stores a program for causing a processor included in an image capture apparatus, when executed by the processor, to functions as:

an area detection unit configured to detect, from an image, a subject area and a characteristic area within the subject area;

a setting unit configured to set an AF area to the characteristic area;

a defocus amount detection unit configured to detect a defocus amount for the AF area and defocus amounts for peripheral areas of the AF area;

a correction unit configured to correct the defocus amount detected for the AF area based on the defocus amounts detected for the peripheral areas; and

a focus adjustment unit configured to adjust focus of an imaging optical system based on the defocus amount corrected by the correction unit.