Image pickup apparatus, image pickup method, and non-transitory computer-readable storage medium for adjusting a parameter to correct influence depending on an in-focus position

1. An apparatus, comprising:

a sensor configured to pick up a plurality of images different in in-focus position in an optical axis direction;

at least one memory configured to store instructions; and

at least one processor in communication with the at least one memory and configured to execute the instructions to:

estimate a variation of an effective F-number based on a relationship between an in-focus position and the effective F-number;

adjust a parameter relating to image pickup to correct influence caused by the variation of the effective F-number when at least a part of the plurality of images is picked up; and

synthesize the plurality of images.

2. The apparatus according to claim 1 , wherein the at least one processor further executes instructions to adjust an aperture to make the effective F-number equal when the at least a part of the images is picked up.

3. The apparatus according to claim 1 , wherein the at least one processor further executes instructions to adjust at least any of one of an exposure time and a gain to correct influence on brightness caused by the effective F-number varied depending on the in-focus position.

4. The apparatus according to claim 1 , wherein the at least one processor further executes instructions to adjust at least any of one of an exposure time and a gain to correct influence on brightness caused by the effective F-number varied depending on the in-focus position in a case where an aperture is not adjustable to make the effective F-number equal.

5. The apparatus according to claim 4 , wherein the at least one processor further executes instructions to adjust the exposure time in preference to the gain.

6. The apparatus according to claim 1 , wherein the plurality of images is overlapped in at least a part of angle of view.

7. The apparatus according to claim 1 ,

wherein the at least one processor further executes instructions to generate a synthesized image with use of the plurality of images, and

wherein a depth of field of the synthesized image is deeper than a depth of field of each of the plurality of images.

8. The apparatus according to claim 1 , wherein intervals of the in-focus positions of at least a part of the plurality of images are equal to one another.

9. The apparatus according to claim 1 , wherein depths of field of at least a part of the plurality of images are equal to each other.

10. The apparatus according to claim 1 , wherein the sensor picks up the plurality of images while the in-focus position is moved from a closest end side to an infinite end side.

11. The apparatus according to claim 1 , wherein the at least one processor further executes instructions to:

acquire an effective F-number when the sensor picks up one image of the plurality of images; and

adjust the parameter relating to the image pickup in order to make the effective F-number of the plurality of images be equal to the effective F-number of the one image of the plurality of images.

12. The apparatus according to claim 11 , wherein the at least one processor further executes instructions to acquire the effective F-number of the image that is picked up first, among the plurality of images.

13. The apparatus according to claim 11 , wherein the at least one processor further executes instructions to acquire the effective F-number when the image is picked up while an aperture opens at maximum.

14. The apparatus according to claim 1 , further comprising a display configured to display the effective F-number.

15. The apparatus according to claim 1 , wherein the at least one processor further executes instructions to issue warning in a case where the effective F-number when the sensor picks up the image is different from a nominal F-number.

16. A method, comprising:

picking up a plurality of images different in in-focus position in an optical axis direction;

estimating a variation of an effective F-number based on a relationship between an in-focus position and the effective F-number;

adjusting a parameter relating to image pickup to correct influence caused by the variation of the effective F-number when at least a part of the plurality of images is picked up; and

synthesizing the plurality of images.

17. The method according to claim 16 , wherein the plurality of images is overlapped in at least a part of angle of view.

18. A non-transitory computer-readable storage medium which stores a program for causing a computer of an image pickup apparatus to execute a method, the method comprising:

picking up a plurality of images different in in-focus position in an optical axis direction;

estimating a variation of an effective F-number based on a relationship between an in-focus position and the effective F-number;

adjusting a parameter relating to image pickup to correct influence caused by agthe variation of the effective F-number varied depending on an in-focus position when at least a part of the plurality of images is picked up; and

synthesizing the plurality of images.

19. The non-transitory computer-readable storage medium according to claim 18 , wherein the plurality of images is overlapped in at least a part of angle of view.

20. The apparatus according to claim 1 , wherein the relationship between the in-focus position and the effective F-number is acquired as lens information.