Computer user detection apparatus and associated method

• US 20060140452A1
• Filed: 12/14/2005
• Published: 06/29/2006
• Est. Priority Date: 12/15/2004
• Status: Active Application

• Current Assignee: STMicroelectronics Limited (STMicroelectronics NV)
• Original Assignee: STMicroelectronics Limited (STMicroelectronics NV)
• Inventors: Stewart, Brian Douglas, Raynor, Jeffrey
• Application Number:
  US11/300,144
• Publication Number:
  US 20060140452A1
• Time in Patent Office: Days
• US Class Current: 382/115
• CPC Class Codes: G06F 1/3203 Power management, i.e. event-based initiation of a power-saving mode
• CPC Class Codes: G06F 1/3231 Monitoring the presence, absence or movement of users
• CPC Class Codes: G06F 21/32 using biometric data, e.g. fingerprints, iris scans or voiceprints
• CPC Class Codes: G06F 21/43 wireless channels
• CPC Class Codes: Y02D 10/00 Energy efficient computing, e.g. low power processors, power management or thermal management

Abstract

A detection apparatus is for a computer to detect the presence or absence of a computer user. The absence of a user can trigger a computer display to power down, while the detected presence of a user can trigger the display to power back up, and, optionally, require a log in. The detection apparatus may operate automatically and thus may provide a reliable way of saving power and/or ensuring security of computer data.

Claims

1-28. -28. (canceled)

29. An apparatus for detecting the presence or absence of a computer user adjacent a computer screen, the apparatus comprising:

at least one array including a plurality of light sensing elements;

a circuit generating output data representative of light incident on said at least one array; and

a processor for detecting the presence or absence of the computer user adjacent the computer screen based on the output data from said circuit.

30. The apparatus of claim 29 further comprising an output interface coupled to said processor for sending command signals to a computer to selectively perform at least one of adjusting an operation mode of the computer screen and logging out the computer user.

31. The apparatus of claim 29 wherein said at least one array comprises at least one linear array.

32. The apparatus of claim 31 wherein said at least one linear array comprises a plurality of linear arrays arranged in a two dimensional array.

33. The apparatus of claim 32 wherein the two dimensional array of light sensing elements has a width of less than one hundred and twenty light sensing elements, and a length of less than one hundred and sixty light sensing elements.

34. The apparatus of claim 29 wherein said processor comprises at least one of a motion detection algorithm, a focus detection algorithm, and a color detection algorithm.

35. The apparatus of claim 29 wherein the computer screen is operable in a first high power mode and a second low power mode;

and wherein said processor selectively operates the computer screen to be in the first high power mode when the computer user is detected and to be in the second low power mode when the computer user is not detected.

36. The apparatus of claim 29 wherein the output interface sends a command signal to the computer via at least one of a wired communication interface and a wireless communication interface.

37. A computer comprising:

a computer screen to receive a computer user adjacent thereto;

a plurality of light sensing elements; and

a processor for detecting the presence or absence of the computer user adjacent the computer screen based on said plurality of light sensing elements.

38. The computer of claim 37 further comprising an output interface coupled to said processor for sending command signals to selectively perform at least one of adjusting an operation mode of the computer screen and logging out the computer user.

39. The computer of claim 37 wherein said plurality of light sensing elements are arranged in at least one linear array.

40. The computer of claim 37 wherein said processor comprises at least one of a motion detection algorithm, a focus detection algorithm, and a color detection algorithm.

41. The apparatus of claim 37 wherein the computer screen is operable in a first high power mode and a second low power mode;

and wherein said processor selectively operates the computer screen to be in the first high power mode when the computer user is detected and to be in the second low power mode when the computer user is not detected.

42. A method of detecting the presence or absence of a computer user adjacent a computer screen, the method comprising:

providing at least one array including a plurality of light sensing elements;

generating output data representative of light incident on the at least one array; and

processing the output data via a processor to detect a presence or absence of the computer user adjacent the computer screen based on the output data.

43. The method of claim 42 further comprising:

providing an output interface; and

sending command signals from the output interface to the processor to selectively perform at least one of adjusting an operation mode of the computer screen and logging out the computer user.

44. The method of claim 42 wherein the processing comprises using at least one of a motion detection algorithm, a focus detection algorithm, and a color detection algorithm.

45. The method of claim 44 wherein the motion detection algorithm comprises determining frame by frame changes in intensity of outputs from the at least one array, and comparing the changes with a motion threshold, and, if the changes exceed the motion threshold, detecting the presence or the absence of a computer user.

46. The method of claim 45 further comprising measuring a reference intensity and performing a frame by frame normalization based on the reference intensity prior to detecting the presence or absence of the computer user.

47. The method of claim 44 wherein the focus detection algorithm comprises detecting a presence or absence of the computer user based upon a threshold distance from the computer screen.

48. The method of claim 47 wherein the focus detection algorithm further comprises a first training component that learns a typical distance of the computer user from the compute screen.

49. The method of claim 44 wherein the color detection algorithm comprises a color balancing component to compensate for variations in scene illumination.

50. The method of claim 44 wherein the color detection algorithm comprises a second training component that learns a typical skin tone of the computer user.

51. The method of claim 44 wherein the color detection algorithm and the focus detection algorithm operate to verify the presence of the computer user having predetermined skin tone properties, and being at a threshold distance from the computer screen.

52. The method of claim 44 wherein the motion detection algorithm, the focus detection algorithm, and the color detection algorithm operate before detecting the presence or absence of the computer user.

53. The method of claim 44 wherein at least one of the motion threshold, a focus threshold, and a color threshold used for detection of the presence of the computer user is different for detecting the absence of the computer user.

54. The method of claim 44 further comprising using one of the motion detection algorithm, the focus detection algorithm, and the color detection algorithm for detection of the presence or the absence, and, when the presence or the absence is detected, using an unused algorithm to verify the presence or the absence.

55. The method of claim 42 wherein the at least one array comprises at least one linear array;

and wherein the at least one linear array comprises a plurality of linear arrays arranged in a two dimensional array.

56. The method of claim 44 wherein the motion detection algorithm ignores motion in a specified region of space.

57. The method of claim 55 further comprising operating the two dimensional array to recognize a human face.

58. The method of claim 57 wherein the two dimensional array recognizes the human face by verifying a presence of eyes, checking for a round head in focus, and checking a height of a head.

59. The method of claim 42 wherein the output data is obtained at a frame rate equal to or less than five frames per second.