Method and apparatus for image capturing capable of effectively reproducing quality image and electronic apparatus using the same

• US 20070285553A1
• Filed: 05/14/2007
• Published: 12/13/2007
• Est. Priority Date: 05/15/2006
• Status: Abandoned Application

• Current Assignee: Ricoh Company Limited
• Original Assignee: Ricoh Company Limited
• Inventors: Sakuma, Nobuo, Yamanaka, Yuji, Morita, Nobuhiro
• Application Number:
  US11/798,472
• Publication Number:
  US 20070285553A1
• Time in Patent Office: Days
• US Class Current: 348/335
• CPC Class Codes: H04N 23/80 Camera processing pipelines; Components thereof

Abstract

An image capturing apparatus includes an imaging lens, an image pickup device, and a correcting circuit. The imaging lens is configured to focus light from an object to form an image. The image pickup device is configured to pick up the image formed by the imaging lens. The correcting circuit is configured to execute computations for correcting image degradation of the image caused by the imaging lens. The imaging lens is also a single lens having a finite gain of optical transfer function and exhibiting a minute difference in the gain between different angles of view of the imaging lens.

Claims

1. An image capturing apparatus comprising:

an imaging lens to focus light from an object to form an image;

an image pickup device to pick up the image formed by the imaging lens; and

a correcting circuit to execute computations for correcting image degradation of the image caused by the imaging lens,

wherein the imaging lens is a single lens having a finite gain of optical transfer function and exhibits a minute difference in the gain between different angles of view of the imaging lens.

2. The image capturing apparatus according to claim 1, wherein the single lens has a surface of positive power facing the image and any one of a surface of zero power and a surface of positive power, facing the object.

3. The image capturing apparatus according to claim 1, wherein the imaging lens includes only one lens.

9. The image capturing apparatus according to claim 1, wherein the imaging lens is a plane-convex lens having a convex surface facing the image.

10. The image capturing apparatus according to claim 1, wherein the imaging lens is a meniscus lens having a convex surface facing the image.

11. The image capturing apparatus according to claim 9, wherein the convex surface of the imaging lens facing the image is formed in any one of a spherical shape and a non-spherical shape.

12. The image capturing apparatus according to claim 9,

wherein the imaging lens satisfies the following conditions:

1.7≦

|b/r|≦

2.4,
0.0≦

|t/r|≦

1.7, and
1.0≦

|D/r|≦

3.8,

wherein, for the imaging lens, “

b”

represents a back focus, “

r”

represents a radius of curvature of the convex surface, “

t”

represents a lens thickness, and “

D”

represents a lens diameter.

13. The image capturing apparatus according to claim 1, wherein the correcting circuit-separately executes the computations for correcting image degradation for given wavelengths of the light from the object.

14. An electronic apparatus comprising the image capturing apparatus according to claim 1.

16. A method of capturing an image with the image capturing apparatus according to claim 1, comprising the steps of:

focusing light from an object to form an image;

picking up the focused image; and

executing computations for correcting image degradation of the focused image.

4. An image capturing apparatus, comprising:

a lens array including a plurality of imaging lenses, the lens array forming a compound-eye image including single-eye images of the object, the single-eye images being formed by the respective imaging lenses;

a reconstructing circuit to execute computations for reconstructing a single object image from the compound-eye image formed by the lens array; and

a reconstructing-image correcting circuit to execute computations for correcting image degradation of the single object image reconstructed by the reconstructing circuit.

5. The image capturing apparatus according to claim 4, wherein in executing the computations for reconstructing the single object image, the reconstructing circuit determines a relative position between the single-eye images based on a least square sum of brightness deviation between the single-eye images.

6. The image capturing apparatus according to claim 4,

wherein the reconstructed-image correcting circuit separately executes the correcting computations of image degradation for the respective single-eye images, and

wherein the reconstructing circuit executes the reconstructing computations of the single object image based on the single-eye images having been corrected by the reconstructed-image correcting circuit.

7. The image capturing apparatus according to claim 4, wherein the reconstructed-image correcting circuit executes the correcting computations of image degradation for the single object image having been reconstructed by the reconstructing circuit.

8. The image capturing apparatus according to claim 4, further comprising a light shielding member to suppress cross talk of light between the imaging lenses.

15. An electronic apparatus comprising the image capturing apparatus according to claim 4.

17. A method of capturing an image with the image capturing apparatus according to claim 4, comprising the steps of:

forming a compound-eye image including single-eye images of an object;

executing computations for reconstructing a single object image from the compound-eye image; and

executing computations for correcting image degradation of the single object image.

18. A method of capturing an image with the image capturing apparatus according to claim 4, comprising the steps of:

forming a compound-eye image including single-eye images of an object being focused by the plurality of imaging lenses;

picking up the single-eye images;

reading optical transfer function data of at least one of the plurality of imaging lenses;

correcting image degradation of the single-eye images based on the optical transfer function data;

selecting a reference single-eye image from among the single-eye images;

detecting parallaxes between the reference single-eye image and each of the other single-eye images;

reconstructing a single object image based on the parallaxes; and

outputting the single object image.

19. A method of capturing an image with an image capturing apparatus, comprising the steps of:

forming a compound-eye image including single-eye images of an object being focused by a plurality of imaging lenses;

picking up the single-eye images;

reading optical transfer function data of at least one of the plurality of imaging lenses;

correcting image degradation of the single-eye images based on the optical transfer function data;

selecting a reference single-eye image from among the single-eye images;

detecting parallaxes between the reference single-eye image and each of the other single-eye images;

reconstructing a single object image based on the parallaxes; and

outputting the single object image.