Lens control device, imaging apparatus, operation method of lens control device, and program
A lens control device includes a processor that performs a control of generating image data for each of first wavelength range light and second wavelength range light by an image sensor, in which the processor estimates a first focus position of a focus lens for the first wavelength range light based on a first focus evaluation value determined in accordance with the image data of the first wavelength range light, estimates a second focus position of the focus lens for the first wavelength range light based on a second focus evaluation value determined in accordance with the image data of the second wavelength range light, and performs a control of moving the focus lens along an optical axis based on the first focus position in a case in which a comparison result obtained by comparing the first focus position with the second focus position satisfies a predetermined condition.
1. A lens control device comprising:
a processor that performs a control of generating image data for each of first wavelength range light and second wavelength range light by causing an image sensor in which the first wavelength range light and the second wavelength range light are imaged by an imaging lens including a focus lens that is moved along an optical axis to perform imaging for each of the first wavelength range light and the second wavelength range light; and
a memory built in or connected to the processor,
wherein the processor
estimates a first focus position of the focus lens for the first wavelength range light based on a first focus evaluation value determined in accordance with the image data of the first wavelength range light,
estimates a second focus position of the focus lens for the first wavelength range light based on a second focus evaluation value determined in accordance with the image data of the second wavelength range light, and
performs a control of moving the focus lens along the optical axis based on the first focus position in a case in which a comparison result obtained by comparing the first focus position with the second focus position satisfies a predetermined condition.
2. The lens control device according to claim 1 ,
wherein the comparison result is a value corresponding to a deviation amount between the first focus position and the second focus position, and
the predetermined condition is a condition that is equal to or smaller than a first threshold value.
3. The lens control device according to claim 1 ,
wherein the processor
estimates a third focus position of the focus lens for the second wavelength range light based on the second focus evaluation value, and
estimates the second focus position based on the third focus position and a focal length of the imaging lens.
4. The lens control device according to claim 1 ,
wherein the processor
estimates the first focus position in a case in which the first focus evaluation value is equal to or larger than a first reference evaluation value, and
estimates the second focus position in a case in which the second focus evaluation value is equal to or larger than a second reference evaluation value.
5. The lens control device according to claim 4 ,
wherein, in a case in which the second focus evaluation value is smaller than the second reference evaluation value, the processor performs the control of moving the focus lens based on the first focus position.
6. The lens control device according to claim 1 ,
wherein, in a case in which the comparison result satisfies the predetermined condition, the processor selectively performs the control of moving the focus lens along the optical axis based on the first focus position and a control of moving the focus lens along the optical axis based on the second focus position in accordance with a degree of deviation of the second focus position from the first focus position to an infinity side.
7. The lens control device according to claim 6 ,
wherein, in a case in which the degree of deviation of the second focus position from the first focus position to the infinity side is equal to or smaller than a second threshold value, the processor performs the control of moving the focus lens along the optical axis based on the first focus position.
8. The lens control device according to claim 7 ,
wherein, in a case in which the degree of deviation of the second focus position from the first focus position to the infinity side exceeds the second threshold value, the processor performs the control of moving the focus lens along the optical axis based on the second focus position.
9. The lens control device according to claim 1 ,
wherein, in a case in which the comparison result does not satisfy the predetermined condition, the processor reduces a first focus target region included in a first imaging region imaged by the image sensor, causes the image sensor to image the first imaging region for each of the first wavelength range light and the second wavelength range light, and generates the image data of each of the first wavelength range light and the second wavelength range light.
10. The lens control device according to claim 9 ,
wherein the processor performs a control of reducing the first focus target region to a predetermined minimum region.
11. The lens control device according to claim 10 ,
wherein, in a case in which the first focus target region is reduced to the minimum region, the processor selectively performs the control of moving the focus lens along the optical axis based on the first focus position and a control of moving the focus lens along the optical axis based on the second focus position in accordance with a degree of deviation of the second focus position from the first focus position to an infinity side.
12. The lens control device according to claim 11 ,
wherein, in a case in which the degree of deviation of the second focus position from the first focus position to the infinity side is equal to or smaller than a third threshold value, the processor performs the control of moving the focus lens along the optical axis based on the first focus position.
13. The lens control device according to claim 12 ,
wherein, in a case in which the degree of deviation of the second focus position from the first focus position to the infinity side exceeds the third threshold value, the processor performs the control of moving the focus lens along the optical axis based on the second focus position.
14. The lens control device according to claim 1 ,
wherein, in a case in which the first focus evaluation value is smaller than a third reference evaluation value, the processor enlarges a second focus target region included in a second imaging region imaged by the image sensor, causes the image sensor to image the second imaging region for each of the first wavelength range light and the second wavelength range light, and generates the image data for each of the first wavelength range light and the second wavelength range light.
15. The lens control device according to claim 14 ,
wherein the processor performs a control of enlarging the second focus target region to a predetermined maximum region.
16. The lens control device according to claim 15 ,
wherein, in a case in which the second focus target region is enlarged to the maximum region and the second focus evaluation value is smaller than a fourth reference evaluation value, the processor performs a control of moving the focus lens to a fourth focus position determined in accordance with a focal length.
17. The lens control device according to claim 1 ,
wherein the second wavelength range light is visible light, and
the first wavelength range light is light having a longer wavelength than the visible light.
18. An imaging apparatus comprising:
the lens control device according to claim 1 ; and
the image sensor.
19. An operation method of a lens control device including a processor that performs a control of generating image data for each of first wavelength range light and second wavelength range light by causing an image sensor in which the first wavelength range light and the second wavelength range light are imaged by an imaging lens including a focus lens that is moved along an optical axis to perform imaging for each of the first wavelength range light and the second wavelength range light, and a memory built in or connected to the processor, the method comprising:
estimating a first focus position of the focus lens for the first wavelength range light based on a first focus evaluation value determined in accordance with the image data of the first wavelength range light;
estimating a second focus position of the focus lens for the first wavelength range light based on a second focus evaluation value determined in accordance with the image data of the second wavelength range light; and
performing a control of moving the focus lens along the optical axis based on the first focus position in a case in which a comparison result obtained by comparing the first focus position with the second focus position satisfies a predetermined condition.
20. A non-transitory computer-readable storage medium storing a program executable by a computer to perform a process, the computer being applied to a lens control device including a processor that performs a control of generating image data for each of first wavelength range light and second wavelength range light by causing an image sensor in which the first wavelength range light and the second wavelength range light are imaged by an imaging lens including a focus lens that is moved along an optical axis to perform imaging for each of the first wavelength range light and the second wavelength range light, and a memory built in or connected to the processor, the process comprising:
estimating a first focus position of the focus lens for the first wavelength range light based on a first focus evaluation value determined in accordance with the image data of the first wavelength range light;
estimating a second focus position of the focus lens for the first wavelength range light based on a second focus evaluation value determined in accordance with the image data of the second wavelength range light; and
performing a control of moving the focus lens along the optical axis based on the first focus position in a case in which a comparison result obtained by comparing the first focus position with the second focus position satisfies a predetermined condition.