Camera glare reduction system and method

• US 20070280669A1
• Filed: 05/31/2006
• Published: 12/06/2007
• Est. Priority Date: 05/31/2006
• Status: Active Grant

• Current Assignee: Technologies4all Incorporated
• Original Assignee: Technologies4all Incorporated
• Inventors: Karim, John H.
• Granted Patent: US 7,729,607 B2
• Time in Patent Office: Days
• US Class Current: 396/155
• CPC Class Codes: G03B 11/00 Filters or other obturators specially adapted for photographic purposes
• CPC Class Codes: G03B 15/03 Combinations of cameras with lighting apparatus; Flash units

Abstract

Various image-capturing systems are disclosed that use polarized filters to reduce or control glare effects on captured images. In one embodiment, the system includes a light source, a first polarized filter adapted to polarize light emanating from the light source; a second polarized filter adapted to perform polarized filtering on received light; and an image-capturing device adapted to receive the filtered light. In another embodiment, the system further includes an actuator to selectively move any of the polarized filter into and out of the light path. In yet another embodiment, a method of forming a resultant image comprises recording a first image with a filter set to a first polarization angle, recording a second image with the filter set to a second polarization angle, and blending the first and second images. The recording of the first and second images may be performed simultaneously or at different times.

Claims

1. A camera or video system, comprising:

a light source;

a first polarized filter adapted to polarize light emanating from said light source;

a second polarized filter adapted to perform polarized filtering on a received light of which at least a portion originates from said light source; and

an image-capturing device adapted to receive said filtered light.

2. The camera or video system of claim 1, wherein said light source comprises a flash light.

3. The camera or video system of claim 1, wherein a first polarization of said first polarized filter is substantially parallel to a second polarization of said second polarized filter.

4. The camera or video system of claim 1, wherein a first polarization of said first polarized filter is substantially orthogonal to a second polarization of said second polarized filter.

5. The camera or video system of claim 1, wherein said image-capturing device comprises a film.

6. The camera or video system of claim 1, wherein said image-capturing device comprises a charged coupled device (CCD).

7. The camera or video system of claim 1, wherein said first polarized filter comprises a plurality of polarized filters.

8. The camera or video system of claim 1, wherein said first polarized filter comprises an active polarized filter.

9. The camera or video system of claim 8, wherein said active polarized filter comprises:

a liquid crystal layer (LCL); and

a fixed polarized filter.

10. The camera or video system of claim 8, further comprising:

an input device; and

a processor adapted to control said polarization of said active polarized filter in response to a signal generated by said input device.

11. The camera or video system of claim 10, further comprising a computer readable medium including one or more software modules adapted to control said processor in controlling said polarization of said active polarized filter in response to said signal generated by said input device.

12. The camera or video system of claim 1, wherein said second polarized filter comprises a plurality of polarized filters.

13. The camera or video system of claim 1, wherein said second polarized filter comprises an active polarized filter.

14. The camera or video system of claim 13, wherein said active polarized filter comprises:

a liquid crystal layer (LCL); and

a fixed polarized filter.

15. The camera or video system of claim 13, further comprising:

an input device; and

a processor adapted to control said polarization of said active polarized filter in response to a signal generated by said input device.

16. The camera or video system of claim 15, further comprising a computer readable medium including one or more software modules adapted to control said processor in controlling said active polarized filter in response to said signal generated by said input device.

17. The camera or video system of claim 1, further comprising a processor adapted to perform image processing of image information generated by said light sensitive device from said filtered light.

18. A camera or video system, comprising:

a light source;

an image-capturing device adapted to receive light from said light source;

a polarized filter; and

an actuator adapted to selectively move said polarized filter into a path of said light.

19. The camera or video system of claim 18, wherein said actuator is adapted to move said polarized filter about a rotational axis.

20. The camera or video system of claim 18, wherein said actuator is adapted to move said polarized filter substantially linear.

21. The camera or video system of claim 18, wherein said polarized filter comprises an active polarized filter.

22. The camera or video system of claim 21, wherein said active polarized filter comprises:

a liquid crystal layer (LCL); and

a fixed polarized filter.

23. The camera or video system of claim 18, further comprising:

an input device; and

a processor adapted to control said actuator in moving said polarized filter in response to a signal generated by said input device.

24. The camera or video system of claim 23, further comprising a computer readable medium including one or more software modules adapted to control said processor in controlling said actuator move said polarized filter in response to said signal generated by said input device.

25. A method of generating a resultant image, comprising:

setting an active polarizing filter to a first polarization angle;

recording a first image at a first time, wherein at least a portion of light used to generate said first image passes through said active polarizing filter when set to said first polarization angle;

setting said active polarizing filter to a second polarization angle that is different than said first polarization angle;

recording a second image at a second time different than said first time, wherein at least a portion of light used to generate said second image passes through said active polarizing filter when set to said second polarization angle; and

blending said first and second images image to form said resultant image.

26. The method of claim 25, wherein said first polarization angle and said second polarization angle are substantially 90 degrees apart.

27. The method of claim 25, wherein said first time and said second time occur at substantially the same brightness level of a light source used to generate said light.

28. The method of claim 25, wherein said blending comprises blending at least a portion of individual pixels of said first image with a portion of individual pixels of said second image.

29. The method of claim 25, wherein said blending occurs within a camera.

30. The method of claim 25, further comprising transferring said first and second images to an external device, wherein said external device performs said blending of said first and second images to generate said resultant image.

31. The method of claim 31, wherein said external device comprises a computer.

32. A camera or video system, comprising:

a light source;

a first polarized filter configured to polarize light emanating from said light source;

a beam splitter adapted to split a portion of said polarized light into first and second light components;

a second polarized filter adapted to perform polarized filtering on said first light component;

a first image-capturing device adapted to receive said filtered first light component;

a third polarized filter adapted to perform polarized filtering on said second light component; and

a second image-capturing device adapted to receive said filtered second light component.

33. The camera or video system of claim 32, wherein said light source comprises a flash light or a continuous light source.

34. The camera or video system of claim 32, wherein a first polarization of said first polarized filter is substantially orthogonal to a second polarization of said second polarized filter and substantially parallel to a third polarization of said third polarized filter.

35. The camera or video system of claim 32, wherein said image-capturing device comprises a film.

36. The camera or video system of claim 32, wherein said image-capturing device comprises a charged coupled device (CCD).

37. The camera or video system of claim 32, wherein said first polarized filter comprises a plurality of polarized filters.

38. The camera or video system of claim 32, wherein said second polarized filter comprises a plurality of polarized filters.

39. The camera or video system of claim 32, wherein said third polarized filter comprises a plurality of polarized filters.