360 degree/forward view integral imaging system

• US 6,028,719 A
• Filed: 10/02/1998
• Issued: 02/22/2000
• Est. Priority Date: 10/02/1998
• Status: Expired due to Term

• Current Assignee: Inter Science GmbH
• Original Assignee: Inter Science GmbH
• Inventors: Nordhauser, Steven R., Beckstead, Jeffrey A.
• Primary Examiner(s): Dang, Hung Xuan
• Assistant Examiner(s): LETENDRE, SUZANNE M
• Application Number:
  US09/165,082
• Time in Patent Office: 508 Days
• Field of Search: 359/618, 359/725, 359/626, 359/627, 359/726
• US Class Current: 359/725
• CPC Class Codes: A61B 1/00177 for 90 degrees side-viewing
• CPC Class Codes: G02B 23/2423 of the distal end
• CPC Class Codes: G03B 37/005 Photographing internal surfaces, e.g. of pipe, G03B37/02 - G03B37/06 take precedence; instruments for performing medical examinations of cavities or tubes of the body by photographic inspection A61B1/00
• CPC Class Codes: H04N 23/698 for achieving an enlarged field of view, e.g. panoramic image capture

Abstract

A 360 Degree Forward View Integral Imaging System comprises a panoramic imaging element capable of imaging a full 360 degree panoramic image and a forward image onto a single plane. This system can be integrated with a variety of image capture systems such as a CCD camera, a film based camera, or a fiber optic bundle coupled to a CCD camera for remote imaging. The applications of such a system include but are not limited to pipe inspection, bore hole inspection and remote imaging.

Claims

1. A panoramic imaging element comprising:

a conic mirror reflective on an outer surface thereof, and substantially symmetric about a central axis of symmetry passing therethrough, comprising an apex and a wide region thereof along said central axis of symmetry; and

a focusing element secured proximate a bored-out center at said apex of said conic mirror, also substantially symmetric about said central axis of symmetry;

wherein

light from a panoramic view field is reflected off of the reflective outer surface of said conic mirror and onto an imaging plane substantially perpendicular to said central axis of symmetry, thereby forming a substantially donut-shaped image with a substantially round center hole on said imaging plane; and

light from a forward view field passes through the wide region and an interior of said conic mirror, through said focusing element, and onto said imaging plane, thereby forming a substantially round-shaped image on said imaging plane, substantially within said center hole of said donut-shaped image.

2. The panoramic imaging element of claim 1, wherein a symmetric cross section of said reflective outer surface of said conic mirror is selected from the geometric group consisting of linear, parabolic, hyperbolic, spherical, and elliptical.

3. The panoramic imaging element of claim 1, wherein said focusing element is placed along said central axis of symmetry within said interior of said conic mirror.

4. The panoramic imaging element of claim 1, wherein said focusing element is placed along said central axis of symmetry outside of said interior of said conic mirror.

5. The panoramic imaging element of claim 1, wherein said focusing element is placed along said central axis of symmetry substantially within said bored out center at said apex of said reflective surface.

6. The panoramic imaging element of claim 1, as used in combination with a panoramic imaging system, further comprising:

image detection means detecting said substantially donut-shaped image and said substantially round-shaped image substantially within said center hole of said donut-shaped image on said imaging plane.

7. The panoramic imaging system of claim 6, wherein said image detection means comprises a CCD camera.

8. The panoramic imaging system of claim 6, wherein said image detection means comprises a film camera.

9. The panoramic imaging system of claim 6, wherein said image detection means comprises a fiber optic bundle coupled with a camera.

10. The panoramic imaging system of claim 6, wherein said image detection means comprises a vidicon.

11. The panoramic imaging system of claim 6, further comprising:

image processing means processing and converting said donut-shaped image detected by said image detection means into at least one user-viewable image of substantially ordinary image proportions.

12. The panoramic imaging system of claim 11, wherein said system is used to inspect pipes.

13. The panoramic imaging system of claim 11, wherein said system is used to inspect bore holes.

14. The panoramic imaging system of claim 11, wherein said system is used for surveillance.

15. The panoramic imaging system of claim 11, wherein said system is used for medical endoscopy.

16. A method of forming an imaging plane substantially perpendicular to a central axis of symmetry passing through a conic mirror substantially symmetric about said central axis of symmetry, said image plane comprising both panoramic view field and forward view field images, comprising the steps of:

forming said panoramic view field image by reflecting light from said panoramic view field off of a reflective outer surface of said conic mirror and onto said imaging plane, thereby forming a substantially donut-shaped image with a substantially round center hole on said imaging plane; and

forming said forward view field image by passing light from said forward view field through a wide region and an interior of said conic mirror, through a focusing element proximate a bored-out center at an apex of said conic mirror, said focusing element also substantially symmetric about said central axis of symmetry, and onto said imaging plane, thereby forming a substantially round-shaped image on said imaging plane, substantially within said center hole of said donut-shaped image.

17. The method of claim 16, comprising the further step of selecting a symmetric cross section of said reflective outer surface of said conic mirror from the geometric group consisting of linear, parabolic, hyperbolic, spherical, and elliptical.

18. The method of claim 16, comprising the further step of placing said focusing element along said central axis of symmetry within said interior of said conic mirror.

19. The method of claim 16, comprising the further step of placing said focusing element along said central axis of symmetry outside of said interior of said conic mirror.

20. The method of claim 16, comprising the further step of placing said focusing element along said central axis of symmetry substantially within said bored out center at said apex of said reflective surface.

21. The method of claim 16, as used in combination with a panoramic imaging system, further comprising the step of:

detecting said substantially donut-shaped image and said substantially round-shaped image substantially within said center hole of said donut-shaped image on said imaging plane, using image detection means.

22. The method of claim 21, wherein said image detection means comprises a CCD camera.

23. The method of claim 21, wherein said image detection means comprises a film camera.

24. The method of claim 21, wherein said image detection means comprises a fiber optic bundle coupled with a camera.

25. The method of claim 21, wherein said image detection means comprises a vidicon.

26. The method of claim 21, further comprising the step of:

converting said donut-shaped image detected by said image detection means into at least one user-viewable image of substantially ordinary image proportions, using image processing means.

27. The method of claim 26, wherein said method is used as a method of inspecting pipes.

28. The method of claim 26, wherein said method is used as a method of inspecting bore holes.

29. The method of claim 26, wherein said method is used as a method of conducting surveillance.

30. The method of claim 26, wherein said method is used as a method of performing medical endoscopy.