Imaging device, method, and storage medium

1. An imaging device comprising a first optical system including a lens and configured to control a position of the lens to adjust a focal point, the imaging device further comprising:

first storage configured to store a statistical model generated by learning bokeh which occurs in an image influenced by aberration of a second optical system and changes nonlinearly in accordance with a distance to a subject in the image; and

a processor configured to:

acquire an image influenced by aberration of the first optical system;

input the acquired image to the statistical model and acquire distance information indicative of a distance to a subject in the image; and

control the position of the lens included in the first optical system.

2. The imaging device of claim 1 , wherein the processor is configured to:

select the subject included in the acquired image; and

acquire a distance to the selected subject.

3. The imaging device of claim 2 , wherein

the processor is configured to control the position of the lens included in the first optical system to make the selected subject come into focus.

4. The imaging device of claim 2 , wherein

the processor is configured to control the position of the lens included in the first optical system to make the selected subject not come into focus.

5. The imaging device of claim 1 , wherein

the processor is configured to select the subject based on a user operation.

6. The imaging device of claim 1 , wherein

the statistical model is stored in the first storage for each lens used in the second optical system, and

the processor is configured to input the acquired image to a statistical model corresponding to the lens included in the first optical system and acquire distance information indicative of the distance to the subject in the image.

7. The imaging device of claim 6 , wherein

bokeh changing nonlinearly in accordance with the distance to the subject in the image includes bokeh further changing in accordance with the position in the image.

8. The imaging device of claim 6 , wherein the processor is configured to:

acquire lens information on the lens included in the first optical system;

select a statistical model corresponding to a lens specified based on the lens information, from the first storage; and

input the acquired image to the specified statistical model and acquire distance information indicative of the distance to the subject in the image.

9. The imaging device of claim 6 , further comprising:

second storage configured to store a first aberration map indicative of distribution of bokeh which occurs in an image influenced by aberration of the second optical system using the lens and which depends on a distance to the subject in the image and a position in the image, for each statistical model corresponding to each of lenses used in the second optical system, wherein

the processor is configured to:

specify a first aberration map stored in the second storage, based on bokeh which occurs in an image influenced by aberration of the first optical system; and

input the acquired image to a statistical model corresponding to the specified first aberration map and acquires distance information indicative of a distance to the subject in the image.

10. The imaging device of claim 1 , wherein the processor is configured to:

display an image influenced by aberration of the first optical system;

select a subject in the displayed image in accordance with a user operation; and

input information on a region including the selected subject to a statistical model corresponding to the lens included in the first optical system and acquire distance information indicative of a distance to the subject;

control a position of the lens included in the first optical system so as to make the selected subject come into focus, based on the acquired distance information; and

capture an image in a state where the position of the lens is controlled.

11. A method executed by an imaging device comprising a first optical system including a lens and configured to control a position of the lens to adjust a focal point, the imaging device further comprising first storage configured to store a statistical model generated by learning bokeh which occurs in an image influenced by aberration of a second optical system and changes nonlinearly in accordance with a distance to a subject in the image,

the method comprising:

acquiring an image influenced by aberration of the first optical system;

inputting the acquired image to the statistical model and acquiring distance information indicative of a distance to a subject in the image; and

controlling the position of the lens included in the first optical system.

12. A non-transitory computer-readable storage medium having stored thereon a computer program which is executable by a computer of an imaging device comprising a first optical system including a lens and configured to control a position of the lens to adjust a focal point, the imaging device further comprising first storage configured to store a statistical model generated by learning bokeh which occurs in an image influenced by aberration of a second optical system and changes nonlinearly in accordance with a distance to a subject in the image,

the computer program comprising instructions capable of causing the computer to execute functions of:

acquiring an image influenced by aberration of the first optical system;

inputting the acquired image to the statistical model and acquiring distance information indicative of a distance to a subject in the image; and

controlling the position of the lens included in the first optical system.