Imaging apparatus

Patent metadata

Field	Value
Publication number	US-11288780-B2
Application number	US-202016891097-A
Country	US
Kind code	B2
Filing date	Jun 3, 2020
Priority date	Dec 26, 2017
Publication date	Mar 29, 2022
Grant date	Mar 29, 2022

Abstract

An object of the present invention is provide a coded aperture imaging apparatus that has a refocusing function and can change an angle of view. An imaging apparatus includes an imaging apparatus main body including a coded aperture, an imaging element that outputs a signal indicating a projected image of a subject, and an image restoration unit that reconstructs an image of a spatial domain based on the signal, and a lens attached to the imaging apparatus main body on a subject side from the coded aperture and changes an imaging angle of view in a state where the lens is attached to the imaging apparatus main body with respect to an imaging angle of view in a state where the lens is not attached to the imaging apparatus main body, in which the projected image is formed on the imaging element by the lens and the coded aperture.

First claim

What is claimed is:

1. An imaging apparatus comprising:
an imaging apparatus main body including a coded aperture, an imaging element that outputs a signal indicating a projected image of a subject, and an image restoration processor that is configured to reconstruct an image of a spatial domain based on the signal; and
a lens that is attached to the imaging apparatus main body on a subject side from the coded aperture and changes an imaging angle of view in a state where the lens is attached to the imaging apparatus main body with respect to an imaging angle of view in a state where the lens is not attached to the imaging apparatus main body,
wherein the coded aperture is arranged at the position of a pupil of the lens,
wherein the projected image is formed on the imaging element by causing light from the subject to be transmitted through the lens and the coded aperture, and
wherein the coded aperture is a Fresnel zone plate, and
the image restoration processor generates a multiplied image by multiplying the projected image formed on the imaging element by the Fresnel zone plate with a Fresnel zone pattern corresponding to the Fresnel zone plate and reconstructs the image of the spatial domain by performing Fourier transformation on the multiplied image,
wherein the Fresnel zone pattern includes a first Fresnel zone pattern and a second Fresnel zone pattern that has a same local spatial frequency in each region as the first Fresnel zone pattern and has a phase shifted by a range of 70 degree to 100 degree with respect to a phase of the first Fresnel zone pattern.

2. The imaging apparatus according to claim 1 ,
wherein the lens is a lens that does not decrease an edge part light quantity in a state where the lens is attached to the imaging apparatus main body below an edge part light quantity in a state where the lens is not attached to the imaging apparatus main body.

3. The imaging apparatus according to claim 1 ,
wherein the lens is a lens that increases the imaging angle of view in a state where the lens is attached to the imaging apparatus main body above the imaging angle of view in a state where the lens is not attached to the imaging apparatus main body.

4. The imaging apparatus according to claim 2 ,
wherein the lens is a lens that increases the imaging angle of view in a state where the lens is attached to the imaging apparatus main body above the imaging angle of view in a state where the lens is not attached to the imaging apparatus main body.

5. The imaging apparatus according to claim 1 ,
wherein the lens is a lens that decreases the imaging angle of view in a state where the lens is attached to the imaging apparatus main body below the imaging angle of view in a state where the lens is not attached to the imaging apparatus main body.

6. The imaging apparatus according to claim 1 ,
wherein the lens is an interchangeable lens that is attached to or detached from the imaging apparatus main body.

7. The imaging apparatus according to claim 2 ,
wherein the lens is an interchangeable lens that is attached to or detached from the imaging apparatus main body.

8. The imaging apparatus according to claim 3 ,
wherein the lens is an interchangeable lens that is attached to or detached from the imaging apparatus main body.

9. The imaging apparatus according to claim 4 ,
wherein the lens is an interchangeable lens that is attached to or detached from the imaging apparatus main body.

10. The imaging apparatus according to claim 5 ,
wherein the lens is an interchangeable lens that is attached to or detached from the imaging apparatus main body.

11. The imaging apparatus according to claim 1 ,
wherein the imaging apparatus main body includes a lens attachment port to which the lens is attached on the subject side from the coded aperture.

12. The imaging apparatus according to claim 2 ,
wherein the imaging apparatus main body includes a lens attachment port to which the lens is attached on the subject side from the coded aperture.

13. The imaging apparatus according to claim 3 ,
wherein the imaging apparatus main body includes a lens attachment port to which the lens is attached on the subject side from the coded aperture.

14. The imaging apparatus according to claim 4 ,
wherein the imaging apparatus main body includes a lens attachment port to which the lens is attached on the subject side from the coded aperture.

15. The imaging apparatus according to claim 1 ,
wherein the image restoration processor corrects aberration caused by the lens in the image of the spatial domain.

16. The imaging apparatus according to claim 15 , further comprising:
a lens information acquisition processor that is configured to acquire information about the lens,
wherein the image restoration processor corrects the aberration based on the acquired information.

17. The imaging apparatus according to claim 1 ,
wherein the image restoration processor generates a complex image composed of an image of a real part and an image of an imaginary part as the multiplied image by multiplying the projected image with each of the first Fresnel zone pattern and the second Fresnel zone pattern and reconstructs the image of the spatial domain by performing two-dimensional complex Fourier transformation on the complex image.

18. The imaging apparatus according to claim 17 ,
wherein the image restoration processor generates the complex image by using the first Fresnel zone pattern and the second Fresnel zone pattern having different magnification ratios depending on a subject distance to be focused.

19. An imaging apparatus main body comprising:
a coded aperture;
an imaging element that outputs a signal indicating a projected image of a subject projected by causing light from the subject to be transmitted through the coded aperture; and
an image restoration processor that is configured to reconstruct an image of a spatial domain based on the signal,
wherein the imaging apparatus main body includes a lens attachment port to which a lens is attached on a subject side from the coded aperture, and a lens information acquisition processor that is configured to acquire lens information about the lens,
wherein the coded aperture is arranged at the position of a pupil of the lens,
wherein the image restoration processor corrects aberration caused by the lens in the image of the spatial domain, and
wherein the coded aperture is a Fresnel zone plate, and
the image restoration processor generates a multiplied image by multiplying the projected image formed on the imaging element by the Fresnel zone plate with a Fresnel zone pattern corresponding to the Fresnel zone plate and reconstructs the image of the spatial domain by performing Fourier transformation on the multiplied image,
wherein the Fresnel zone pattern includes a first Fresnel zone pattern and a second Fresnel zone pattern that has a same local spatial frequency in each region as the first Fresnel zone pattern and has a phase shifted by a range of 70 degree to 100 degree with respect to a phase of the first Fresnel zone pattern.

Assignees

• Fujifilm Corp

Inventors

• Kishine Yasunobu
• Komatsu Daiki

Classifications

• H04N23/957 Primary

  Light-field or plenoptic cameras or camera modules · CPC title

• H04N23/60

  Control of cameras or camera modules · CPC title

• G02B15/10

  by adding a part, e.g. close-up attachment · CPC title

• G03B17/14

  interchangeably · CPC title

• G02B15/12

  by adding telescopic attachments (G02B15/14 takes precedence) · CPC title