Display panel

• US 20060119798A1
• Filed: 12/02/2004
• Published: 06/08/2006
• Est. Priority Date: 12/02/2004
• Status: Active Grant

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Inventors: Blythe, Gregory W., Huddleston, Wyatt A., Blythe, Michael M.
• Granted Patent: US 8,508,710 B2
• Time in Patent Office: Days
• US Class Current: 353/42
• CPC Class Codes: G06F 3/0425 using a single imaging device like a video camera for tracking the absolute position of a single or a plurality of objects with respect to an imaged reference surface, e.g. video camera imaging a display or a projection screen, a table or a wall surface, on which a computer generated image is displayed or projected tracking a projected light spot to determine a position on a display surface G06F3/0386
• CPC Class Codes: H04N 5/74 Projection arrangements for image reproduction, e.g. using eidophor

Abstract

In accordance with one embodiment of the present disclosure, a difference is detected between a first image and a second image. The second image can include at least a portion of the first image reflected from a display panel and light from an object passing through the display panel.

Claims

1. A method, comprising:

capturing a second image comprising at least a portion of a first image reflected from a display panel and light from an object passing through the display panel; and

detecting a difference between the first image and the second image.

2. The method of claim 1, further comprising projecting the first image onto a display panel.

3. The method of claim 2, wherein:

the first image is projected onto a first side of the display panel; and

,

the object is in proximity with a second side of the display panel.

4. The method of claim 1, wherein light from the object is light reflected from the object.

5. The method of claim 1, wherein light from the object is light emitted from the object.

6. The method of claim 1, wherein the difference between the first image and the second image is a representation of at least a portion of the object.

8. The method of claim 1, wherein the first image is produced from a first image file, the method further comprising generating a second image file from the second image.

9. The method of claim 8, wherein detecting a difference between the first image and the second image comprises detecting a difference between the first image file and the second image file.

10. The method of claim 9, wherein detecting a difference between the first image file and the second image file comprises comparing a portion of the first image file to a corresponding portion of the second image file.

11. The method of claim 9, wherein:

the first image file comprises a plurality of first pixels;

the second image file comprises a plurality of second pixels; and

,

detecting a difference between the first image file and the second image file comprises detecting a difference between a first pixel and a corresponding second pixel.

12. The method of claim 9, wherein:

the first image file comprises a plurality of first pixels;

the second image file comprises a plurality of second pixels; and

,

detecting a difference between the first image file and the second image file comprises detecting a difference between a group of first pixels and a corresponding group of second pixels.

13. The method of claim 12, wherein:

the group of first pixels is a line of first pixels; and

,

the group of second pixels is a line of second pixels.

14. The method of claim 12, wherein:

the group of first pixels is an array of first pixels; and

,

the group of second pixels is an array of second pixels.

15. The method of claim 9, further comprising:

capturing a third image that comprises at least a portion of the first image reflected from the display panel and light from the object, wherein the third image is subsequent to the second image;

generating a third image file from the third image; and

,

detecting a second difference between the second image file and the third image file, wherein the second difference is a representation of at least a portion of the object.

16. The method of claim 15, wherein the second difference is a representation of a change in position of the object relative to the display panel.

17. A method, comprising:

projecting a first image onto a first side of a display panel;

capturing a second image that comprises at least a portion of the first image reflected from the display panel and light transmitted from an object in proximity with a second side of the display panel;

capturing a third image that comprises at least a portion of the first image reflected from the display panel as well as light transmitted from the object, wherein the third image is subsequent to the second image; and

,

detecting a difference between the second image and the third image, wherein the difference is a representation of at least a portion of the object.

18. The method of claim 17, further comprising:

generating a first image file from the second image; and

,

generating a second image file from the third image, wherein detecting a difference between the second image and the third image comprises detecting a difference between the first image file and the second image file.

19. The method of claim 17, wherein:

the first image file comprises a plurality of first pixels;

the second image file comprises a plurality of second pixels; and

,

detecting a difference between the first image file and the second image file comprises detecting a difference between a group of one or more of the first pixels and a corresponding group of one or more of the second pixels.

20. A method of detecting the presence of an object, the method comprising:

capturing a second image comprising at least a portion of a first image reflected from the display panel and light transmitted from the object and passes through the display panel; and

detecting a difference between the first image and the second image.

21. The method of claim 20, further comprising projecting the first image onto a display panel.

22. The method of claim 21, wherein:

the first image is projected onto a first side of the display panel; and

,

the object is in proximity with a second side of the display panel.

23. The method of claim 20, wherein light transmitted from the object is light reflected from the object.

24. The method of claim 20, wherein light transmitted from the object is light emitted from the object.

25. The method of claim 20, wherein the difference between the first image and the second image is a representation of at least a portion of the object.

26. The method of claim 25, further comprising analyzing the difference, representing at least a portion of the object, to determine at least one characteristic of the object.

27. The method of claim 25, further comprising:

generating a first file containing the representation of the at least a portion of the object using the difference; and

,

comparing the representation to a second file containing a list of object characteristics.

28. The method of claim 27, further comprising identifying a match between the representation and at least one object characteristic contained in the list.

29. The method of claim 28, further comprising performing an operation in response to identifying the match.

30. The method of claim 26, wherein the at least one characteristic of the object is a position of the object relative to the display panel.

31. The method of claim 30, wherein the position of the object is an orientation of the object relative to the display panel.

32. The method of claim 30, wherein the position of the object is a location of the object relative to the display panel.

33. The method of claim 26, wherein the at least one characteristic is a velocity of the object relative to the display panel.

34. The method of claim 26, wherein the at least one characteristic is a type of object.

35. The method of claim 26, wherein the at least one characteristic is a visual feature of the object.

36. The method of claim 26, further comprising transmitting data to the object in response to determining at least one characteristic of the object.

37. The method of claim 36, wherein transmitting data comprises optically transmitting data through the display panel.

38. An apparatus, comprising a computer readable medium containing a series of computer executable instructions configured to detect a difference between a first image and a second image, wherein the second image is generated by capturing at least a portion of the first image reflected from a display panel and light from an object passing through the display panel.

39. The apparatus of claim 38, wherein the computer executable instructions are further configured to cause the image to be projected onto the display panel.

40. The apparatus of claim 38, wherein:

the first image is projected onto a first side of the display panel; and

,

the object is proximate with a second side of the display panel.

41. The apparatus of claim 38, wherein light from the object is light emitted from the object.

42. The apparatus of claim 38, wherein light from the object is light reflected from the object.

43. The apparatus of claim 38, wherein the computer executable instructions are further configured to define the difference as a representation of at least a portion of the object.

44. The apparatus of claim 43, wherein the computer executable instructions are further configured to:

compare the representation to a list of object characteristics; and

,

identify at least one characteristic of the object in response to comparing the representation to the list.

45. The apparatus of claim 44, wherein the computer executable instructions are further configured to update the first image in response to identifying at least one characteristic.

46. A system, comprising:

an optical receiver configured to capture a second image that comprises at least a portion of a first image reflected from a display panel and light transmitted from an object through the display panel; and

a controller configured to determine a difference between the first image and the second image.

47. The system of claim 46, further comprising an imager configured to viewably project the first image.

48. The system of claim 47, further comprising a controller with which the imager is communicatively linked.

49. The system of claim 47, further comprising a display panel onto which the imager is configured to project the first image.

50. The system of claim 49, wherein the display panel defines:

a first side onto which the imager is configured to project the first image; and

,

a second side with which the object is in proximity.

51. The system of claim 46, further comprising a controller with which the optical receiver is communicatively linked.

52. The system of claim 51, further comprising a computer readable medium containing a series of computer executable instructions which are accessible by the controller and which are configured to detect the difference between the first image and the second image.

53. The system of claim 52, wherein the computer executable instructions are further configured to recognize the difference as a representation of at least a portion of the object.

54. The system of claim 53, wherein the computer executable instructions are further configured to:

compare the representation to a list of object characteristics; and

,

identify at least one characteristic of the object in response to comparing the representation to the list.

55. The system of claim 54, wherein the computer executable instructions are further configured to perform an operation in response to identifying at least one characteristic of the object.

56. The system of claim 52, wherein the computer executable instructions are further configured to detect a difference between the second image and a third image that comprises at least a portion of the first image reflected from the display panel as well as light reflected from the object, wherein the third image is subsequent to the second image.

57. The system of claim 56, wherein the computer executable instructions are further configured to recognize the difference between the second image and the third image as a property of the object.

58. The system of claim 57, wherein the property of the object is selected from the group comprising:

a change in position of the object relative to the display panel; and

,

a velocity of the object relative to the display panel.

59. The system of claim 54, wherein the computer executable instructions are further configured to cause data to be sent to the object in response to identifying at least one characteristic of the object.

60. The system of claim 59, wherein causing data to be sent to the object comprises causing the imager to optically transmit data to the object through the display panel.

61. An apparatus, comprising:

a means for projecting a first image onto a first side of a display panel;

a means for capturing a second image that comprises at least a portion of the first image reflected from the display panel as well as light reflected from an object in proximity with a second side of the display panel; and

,

a means for detecting a difference between the first image and the second image, wherein the difference is a representation of at least a portion of the object.

62. The apparatus of claim 61, wherein the first image is produced from a first image file, the apparatus further comprising a means for producing a second image file from the second image.

63. The apparatus of claim 62, wherein the means for detecting a difference comprises a means for detecting a difference between the first image file and the second image file.