Systems and methods for networked, in-context, high-resolution image viewing

• US 8,572,168 B2
• Filed: 09/21/2012
• Issued: 10/29/2013
• Est. Priority Date: 07/12/2010
• Status: Active Grant

• Current Assignee: Opus Medical, Inc. (Smith & Nephew PLC)
• Original Assignee: Opus Medical, Inc. (Smith & Nephew PLC)
• Inventors: Tahan, Thomas
• Primary Examiner(s): Nguyen, Quang N
• Application Number:
  US13/624,704
• Publication Number:
  US 20130024501A1
• Time in Patent Office: 403 Days
• Field of Search: 345/641, 345/660, 348/231.99, 351/211, 382/263
• US Class Current: 709/203
• CPC Class Codes: G06F 2203/04805 Virtual magnifying lens, i.e. window or frame movable on top of displayed information to enlarge it for better reading or selection
• CPC Class Codes: G06F 3/0481 based on specific properties of the displayed interaction object or a metaphor-based environment, e.g. interaction with desktop elements like windows or icons, or assisted by a cursor's changing behaviour or appearance

Abstract

Systems and methods are provided for viewing portions of an image in high resolution and in context with a full image, which is displayed at a base resolution that is lower resolution than the resolution of the high-resolution image. A user can select an area of interest from the base-resolution image for viewing at a higher resolution on the client device. The server, or in some implementations the client device, can generate a high-resolution image representing the area of interest and the client device can display a portion of the high-resolution image in a virtual lens overlaid on the base-resolution image.

Claims

1. A computer-implemented method for displaying a portion of a higher-resolution image in the context of a lower-resolution image, wherein one or more processors are programmed to perform the steps comprising:

receiving a user indication of a position on a display that corresponds to a point in a lower-resolution image that is displayed on the display, wherein the lower-resolution image comprises an image in a first resolution;

sending a request to a server over a network for a higher-resolution image that corresponds to the lower-resolution image;

receiving the higher-resolution image from the server over the network, wherein the higher-resolution image comprises the image in a second resolution that is higher than the first resolution;

receiving a user request to view a portion of the higher-resolution image in a virtual lens overlaid on the lower-resolution image;

displaying the portion of the higher-resolution image on the display in the virtual lens overlaid on the lower-resolution image, wherein the portion of the higher-resolution image comprises an area that includes a point in the higher-resolution image that matches the point in the lower-resolution image;

tracking changes to the user-indicated position on the display; and

whenever the user-indicated position on the display changes, updating the portion of the higher-resolution image displayed by the virtual lens and positioning the virtual lens with respect to the lower-resolution image, such that, at the user-indicated position on the display, a point in the portion of the higher-resolution image displayed in the virtual lens matches a point in the underlying lower-resolution image.

2. The method of claim 1, wherein the second resolution is less than a resolution of a maximum-resolution image generated on, input to, or stored on the server.

3. The method of claim 1, wherein one or more of the first resolution and the second resolution is selected, at least in part, based on capabilities of a client device or the network.

4. The method of claim 1, further comprising:

receiving a request from a user to resize the virtual lens;

resizing the virtual lens;

determining whether a larger portion of the higher-resolution image is required; and

if it is determined that a larger portion of the higher-resolution image is required, displaying the larger portion of the higher-resolution image in the virtual lens.

5. The method of claim 1, further comprising:

receiving a request from a user to change a shape of the virtual lens to a requested shape;

rendering the virtual lens to have the requested shape;

determining whether a larger portion of the higher-resolution image is required; and

if it is determined that a larger portion of the higher-resolution image is required, displaying the larger portion of the higher-resolution image in the virtual lens.

6. The method of claim 1, further comprising:

receiving a request to change a resolution of the higher-resolution image displayed by the virtual lens;

receiving a second higher-resolution image in a third resolution from the server; and

displaying a portion of the second higher-resolution image in the virtual lens.

7. The method of claim 6, wherein the request to the server over the network for the second higher-resolution image is sent in advance of the request to change the resolution of the higher-resolution image displayed by the virtual lens.

8. The method of claim 1, further comprising freezing a position of the virtual lens with respect to the lower-resolution image in response to a user command.

9. The method of claim 8, further comprising unfreezing the position of the previously frozen virtual lens with respect to the lower-resolution image in response to a user command.

10. The method of claim 1, further comprising rendering a border around the virtual lens to demarcate the virtual lens from the lower-resolution image.

11. The method of claim 1, wherein displaying the portion of the higher-resolution image comprises rendering the virtual lens such that the virtual lens is centered over the user-indicated position.

12. The method of claim 11, further comprising, whenever the user-indicated position on the display changes:

determining whether at least a portion of the virtual lens would be outside a border of the lower-resolution image if the virtual lens were rendered centered over the user-indicated position;

if at least a portion of the virtual lens would be outside a border of the lower-resolution image, determining an offset location for the virtual lens where the virtual lens would not be outside of the border of the lower-resolution image; and

rendering the virtual lens such that the virtual lens and the portion of the higher-resolution image displayed within it is centered over the offset location and, at the user-indicated position on the display, a point in the higher-resolution image displayed in the virtual lens matches a point in the underlying lower-resolution image.

13. The method of claim 1, further comprising adjusting a size, shape, or position of the virtual lens to improve the function of an application in which the virtual lens is being used.

14. The method of claim 1, further comprising hiding the virtual lens in response to a user command.

15. The method of claim 1, further comprising showing the previously hidden virtual lens in response to a user command.

16. The method of claim 1, further comprising rendering an opaque plane between the virtual lens and the underlying lower-resolution image, wherein the opaque plane can be rendered as visible while waiting to receive the higher-resolution image from the server.

17. The method of claim 1, further comprising:

identifying a resolution that a user is likely to request; and

sending a request to the server for the image at the identified resolution.

18. The method of claim 1, further comprising:

identifying one or more additional images that a user of a client device is likely to request; and

sending a request to the server for the identified one or more additional images in order to preload the images on the client device before the user requests the one or more additional images.

19. The method of claim 1, wherein the higher-resolution image comprises a higher-resolution video and the lower-resolution image comprises a lower-resolution video.

20. The method of claim 19, wherein displaying the portion of the higher-resolution image comprises synchronizing a frame rate and a currently displayed frame of the higher-resolution video with a frame rate and currently displayed frame of the lower-resolution video.

21. The method of claim 1, wherein the higher-resolution image is cached in a memory of a client device for later use.

22. The method of claim 1, further comprising:

determining whether the lower-resolution image exceeds the size of a display region of the display;

displaying a portion of the lower-resolution image within the display region;

determining whether the virtual lens has reached an edge of the display region; and

if the virtual lens has reached the edge of the display region, stopping movement of the virtual lens and scrolling the lower-resolution image in an opposite direction as a movement indicated by an input device.

23. The method of claim 22, wherein scrolling the lower-resolution image in the opposite direction as the movement indicated by the input device comprises scrolling the lower-resolution image in the opposite direction as the movement indicated by the input device until the movement indicated by the input device stops or an edge of the lower-resolution image aligns with the edge of the display region.

24. The method of claim 1, wherein the lower-resolution image and the higher-resolution image each comprise a plurality of images.

25. The method of claim 1, wherein the request to the server over the network for the higher-resolution image is sent in advance of the user request to view a portion of the higher-resolution image in the virtual lens.

26. A computer-implemented method for displaying a portion of a higher-resolution image in the context of a lower-resolution image, wherein one or more processors are programmed to perform the steps comprising:

receiving a user indication of a position on a display that corresponds to a point in a lower-resolution image that is displayed on the display, wherein the lower-resolution image comprises an image in a first resolution;

sending a request to a server over a network for a top-resolution image that corresponds to the lower-resolution image;

receiving the top-resolution image from the server over the network, wherein the top-resolution image comprises the image in a second resolution that is higher than the first resolution;

generating a higher-resolution image from the top-resolution image, wherein the higher-resolution image comprises the image in a third resolution that is higher than the first resolution and less than or equal to the second resolution;

receiving a user request to view a portion of the higher-resolution image in a virtual lens overlaid on the lower-resolution image;

displaying the portion of the higher-resolution image on the display in the virtual lens overlaid on the lower-resolution image, wherein the portion of the higher-resolution image comprises an area that includes a point in the higher-resolution image that matches the point in the lower-resolution image;

tracking changes to the user-indicated position on the display; and

whenever the user-indicated position on the display changes, updating the portion of the higher-resolution image displayed by the virtual lens and positioning the virtual lens with respect to the lower-resolution image, such that, at the user-indicated position on the display, a point in the portion of the higher-resolution image displayed in the virtual lens matches a point in the underlying lower-resolution image.

27. The method of claim 26, wherein the second resolution is less than a maximum-resolution image generated on, input to, or stored on the server.

28. The method of claim 26, wherein one or more of the first resolution, the second resolution, and the third resolution is selected, at least in part, based on capabilities of a client device or the network.

29. The method of claim 26, further comprising:

receiving a request from a user to resize the virtual lens;

resizing the virtual lens;

generating a portion of the higher-resolution image at a size that matches that of the virtual lens; and

displaying the generated portion of the higher-resolution image in the virtual lens.

30. The method of claim 26, further comprising:

receiving a request from a user to change a shape of the virtual lens to a requested shape;

rendering the virtual lens to have the requested shape;

generating a portion of the higher-resolution image in a shape that matches that of the virtual lens; and

displaying the generated portion of the higher-resolution image in the virtual lens.

31. The method of claim 26, further comprising:

receiving a request to change a resolution of the higher-resolution image displayed by the virtual lens to a fourth resolution;

if the fourth resolution is less than or equal to the second resolution of the top-resolution image, generating a second higher-resolution image from the top-resolution image, wherein the second higher-resolution image comprises the image in the fourth resolution;

if the fourth resolution is greater than the second resolution of the top-resolution image, sending a request to the server over the network for a second top-resolution image that has a resolution greater than or equal to the fourth resolution, receiving the second top-resolution image from the server over the network, and either generating the second higher-resolution image from the second top-resolution image or using the second top-resolution image as the second higher-resolution image; and

displaying a portion of the second higher-resolution image in the virtual lens.

32. The method of claim 26, further comprising freezing a position of the virtual lens with respect to the lower-resolution image in response to a user command.

33. The method of claim 32, further comprising unfreezing the position of the virtual lens with respect to the lower-resolution image in response to a user command.

34. The method of claim 26, further comprising hiding the virtual lens in response to a user command.

35. The method of claim 34, further comprising showing the previously hidden virtual lens in response to a user command.

36. The method of claim 26, further comprising rendering a border around the virtual lens to demarcate the virtual lens from the lower-resolution image.

37. The method of claim 26, wherein displaying the portion of the higher-resolution image comprises rendering the virtual lens such that the virtual lens is centered over the user-indicated position.

38. The method of claim 37, further comprising, whenever the user-indicated position on the display changes:

determining whether at least a portion of the virtual lens would be outside a border of the lower-resolution image if the virtual lens were rendered centered over the user indicated position;

if at least a portion of the virtual lens would be outside a border of the lower-resolution image, determining an offset location for the virtual lens where the virtual lens would not be outside of the border of the lower-resolution image; and

rendering the virtual lens such that the virtual lens and the portion of the higher-resolution image displayed within it is centered over the offset location and, at the user-indicated position on the display, a point in the higher-resolution image displayed in the virtual lens matches a point in the underlying lower-resolution image.

39. The method of claim 26, further comprising adjusting a size, shape, or position of the virtual lens to improve the function of an application in which the virtual lens is being used.

40. The method of claim 26, further comprising:

identifying one or more additional images that a user of a client device is likely to request; and

sending a request to the server for the identified one or more additional images in order to preload the images on the client device before the user requests the one or more additional images.

41. The method of claim 26, wherein the higher-resolution image comprises a higher-resolution video and the lower-resolution image comprises a lower-resolution video.

42. The method of claim 41, wherein displaying the portion of the higher-resolution image comprises synchronizing a frame rate and a currently displayed frame of the higher-resolution video with a frame rate and currently displayed frame of the lower-resolution video.

43. The method of claim 26, wherein the top-resolution image is cached in a memory of a client device for later use.

44. The method of claim 26, further comprising:

determining whether the lower-resolution image exceeds the size of a display region of the display;

displaying a portion of the lower-resolution image within the display region;

determining whether the virtual lens has reached an edge of the display region; and

if the virtual lens has reached the edge of the display region, stopping movement of the virtual lens and scrolling the lower-resolution image in an opposite direction as a movement indicated by an input device.

45. The method of claim 44, wherein scrolling the lower-resolution image in the opposite direction as the movement indicated by the input device comprises scrolling the lower-resolution image in the opposite direction as the movement indicated by the input device until the movement indicated by the input device stops or an edge of the lower-resolution image aligns with the edge of the display region.

46. The method of claim 26, wherein the lower-resolution image, the top-resolution image, and the higher-resolution image each comprise a plurality of images.

47. The method of claim 26, wherein, when the third resolution is less than the second resolution, generating the higher-resolution image from the top-resolution image includes downscaling the top-resolution image from the second resolution to the third resolution to create the higher-resolution image.

48. A computer-implemented method for displaying a portion of a higher-resolution image in the context of a lower-resolution image, wherein one or more processors are programmed to perform the steps comprising:

receiving a user indication of a position on a display that corresponds to a point in a lower-resolution image that is displayed on the display, wherein the lower-resolution image comprises an image in a first resolution;

sending a request to a server over a network for a higher-resolution image that corresponds to the lower-resolution image;

receiving the higher-resolution image from the server over the network, wherein the higher-resolution image comprises a portion of the image in a second resolution that is higher than the first resolution;

receiving a user request to view at least a portion of the higher-resolution image in a virtual lens overlaid on the lower-resolution image;

displaying the at least a portion of the higher-resolution image on the display in the virtual lens overlaid on the lower-resolution image, wherein the at least a portion of the higher-resolution image comprises an area that includes a point in the higher-resolution image that matches the point in the lower-resolution image;

tracking changes to the user-indicated position on the display; and

whenever the user-indicated position on the display changes, updating the at least a portion of the higher-resolution image displayed by the virtual lens and positioning the virtual lens with respect to the lower-resolution image, such that, at the user-indicated position on the display, a point in the at least a portion of the higher-resolution image displayed in the virtual lens matches a point in the underlying lower-resolution image.

49. The method of claim 48, wherein the second resolution is less than a resolution of a maximum-resolution image generated on, input to, or stored on the server.

50. The method of claim 48, wherein one or more of the first resolution and the second resolution is selected, at least in part, based on capabilities of a client device or the network.

51. The method of claim 48, further comprising:

receiving a request from a user to resize the virtual lens;

resizing the virtual lens;

determining whether a larger portion of the image in the second resolution is required from the server;

if a larger portion of the image in the second resolution is required, sending a request to the server for a second higher-resolution image, wherein the second higher-resolution image comprises at least a larger portion of the image in the second resolution;

receiving the second higher-resolution image from the server; and

displaying the second higher-resolution image in the virtual lens.

52. The method of claim 48, further comprising:

receiving a request from a user to change a shape of the virtual lens to a requested shape;

rendering the virtual lens to have the requested shape;

determining whether a larger portion of the image in the second resolution is required from the server;

if a larger portion of the image in the second resolution is required, sending a request to the server for a second higher-resolution image, wherein the second higher-resolution image comprises at least a larger portion of the image in the second resolution;

receiving the second higher-resolution image from the server; and

displaying the second higher-resolution image in the virtual lens.

53. The method of claim 48, further comprising:

receiving a request to change a resolution of the higher-resolution image displayed by the virtual lens;

receiving a second higher-resolution image comprising at least a portion of the image in a third resolution from the server; and

displaying at least a portion of the second higher-resolution image in the virtual lens.

54. The method of claim 53, wherein the request to the server over the network for the second higher-resolution image is sent in advance of the request to change the resolution of the higher-resolution image displayed by the virtual lens.

55. The method of claim 48, further comprising freezing a position of the virtual lens with respect to the lower-resolution image in response to a user command.

56. The method of claim 55, further comprising unfreezing the position of the previously frozen virtual lens with respect to the lower-resolution image in response to a user command.

57. The method of claim 48, further comprising rendering a border around the virtual lens to demarcate the virtual lens from the lower-resolution image.

58. The method of claim 48, wherein displaying the at least a portion of the higher-resolution image comprises rendering the virtual lens such that the virtual lens is centered over the user-indicated position.

59. The method of claim 58, further comprising, whenever the user-indicated position on the display changes:

determining whether at least a portion of the virtual lens would be outside a border of the lower-resolution image if the virtual lens were rendered centered over the user-indicated position;

if at least a portion of the virtual lens would be outside a border of the lower-resolution image, determining an offset location for the virtual lens where the virtual lens would not be outside of the border of the lower-resolution image; and

rendering the virtual lens such that the virtual lens and the at least a portion of the higher-resolution image displayed within it is centered over the offset location and, at the user-indicated position on the display, a point in the higher-resolution image displayed in the virtual lens matches a point in the underlying lower-resolution image.

60. The method of claim 48, further comprising adjusting a size, shape, or position of the virtual lens to improve the function of an application in which the virtual lens is being used.

61. The method of claim 48, further comprising hiding the virtual lens in response to a user command.

62. The method of claim 48, further comprising showing the previously hidden virtual lens in response to a user command.

63. The method of claim 48, further comprising rendering an opaque plane between the virtual lens and the underlying lower-resolution image, wherein the opaque plane can be rendered as visible while waiting to receive the higher-resolution image from the server after the request for the higher-resolution image has been sent to the server.

64. The method of claim 48, further comprising:

identifying a resolution is likely to request; and

sending a request to the server for a portion of the image at the identified resolution.

65. The method of claim 48, further comprising:

identifying one or more additional images that a user of a client device is likely to request; and

sending a request to the server for the identified one or more additional images in order to preload the images on the client device before the user requests the one or more additional images.

66. The method of claim 48, wherein the higher-resolution image comprises a higher-resolution video and the lower-resolution image comprises a lower-resolution video.

67. The method of claim 66, wherein displaying the at least a portion of the higher-resolution image comprises synchronizing a frame rate and a currently displayed frame of the higher-resolution video with a frame rate and currently displayed frame of the lower-resolution video.

68. The method of claim 48, wherein the higher-resolution image is cached in a memory of a client device for later use.

69. The method of claim 48, further comprising:

determining whether the lower-resolution image exceeds the size of a display region of the display;

displaying a portion of the lower-resolution image within the display region;

determining whether the virtual lens has reached an edge of the display region; and

if the virtual lens has reached the edge of the display region, stopping movement of the virtual lens and scrolling the lower-resolution image in an opposite direction as a movement indicated by an input device.

70. The method of claim 69, wherein scrolling the lower-resolution image in the opposite direction as the movement indicated by the input device comprises scrolling the lower-resolution image in the opposite direction as the movement indicated by the input device until the movement indicated by the input device stops or an edge of the lower-resolution image aligns with the edge of the display region.

71. The method of claim 48, wherein the lower-resolution image and the higher-resolution image each comprise a plurality of images.

72. The method of claim 48, wherein the request to the server over the network for the higher-resolution image is sent in advance of the user request to view at least a portion of the higher-resolution image in the virtual lens.

73. A computer-implemented method for displaying a portion of a higher-resolution image in the context of a lower-resolution image, wherein one or more processors are programmed to perform the steps comprising:

receiving a user indication of a position on a display that corresponds to a point in a lower-resolution image that is displayed on the display, wherein the lower-resolution image comprises an image in a first resolution;

sending a request to a server over a network for a top-resolution image that corresponds to the lower-resolution image;

receiving the top-resolution image from the server over the network, wherein the top-resolution image comprises at least a portion of the image in a second resolution that is higher than the first resolution;

generating a higher-resolution image from the top-resolution image, wherein the higher-resolution image comprises a portion of the image in a third resolution that is higher than the first resolution and less than or equal to the second resolution;

receiving a user request to view at least a portion of the higher-resolution image in a virtual lens overlaid on the lower-resolution image;

displaying the at least a portion of the higher-resolution image on the display in the virtual lens overlaid on the lower-resolution image, wherein the at least a portion of the higher-resolution image comprises an area that includes a point in the higher-resolution image that matches the point in the lower-resolution image;

tracking changes to the user-indicated position on the display; and

whenever the user-indicated position on the display changes, updating the at least a portion of the higher-resolution image displayed by the virtual lens and positioning the virtual lens with respect to the lower-resolution image, such that, at the user-indicated position on the display, a point in the at least a portion of the higher-resolution image displayed in the virtual lens matches a point in the underlying lower-resolution image.

74. The method of claim 73, wherein the second resolution is less than a resolution of a maximum-resolution image generated on, input to, or stored on the server.

75. The method of claim 73, wherein one or more of the first resolution and the second resolution is selected, at least in part, based on capabilities of a client device or the network.

76. The method of claim 73, further comprising:

receiving a request from a user to resize the virtual lens;

resizing the virtual lens;

determining whether a larger portion of the higher-resolution image in the third resolution is required;

if a larger portion of the higher-resolution image is required, determining whether a second top-resolution image comprising a larger portion of the image in the second resolution is required;

if a second top-resolution image is required, sending a request to the server for the second top-resolution image, and generating a larger portion of the higher-resolution image from the second top-resolution image;

if a second top-resolution image is not required, generating the larger portion of the higher-resolution image from the first top-resolution image; and

displaying the larger portion of the higher-resolution image in the virtual lens.

77. The method of claim 73, further comprising:

receiving a request from a user to change a shape of the virtual lens to a requested shape;

rendering the virtual lens to have the requested shape;

determining whether a larger portion of the higher-resolution image is required;

if a larger portion of the higher-resolution image is required, determining whether a second top-resolution image comprising a larger portion of the image in the second resolution is required;

if a second top-resolution image is required, sending a request to the server for the second top-resolution image, and generating a larger portion of the higher-resolution image from the second top-resolution image;

if a second top-resolution image is not required, generating the larger portion of the higher-resolution image from the first top-resolution image; and

displaying the larger portion of the higher-resolution image in the virtual lens.

78. The method of claim 73, further comprising:

receiving a request to change a resolution of the higher-resolution image displayed by the virtual lens to a fourth resolution;

if the fourth resolution is less than or equal to the second resolution of the top-resolution image, generating a second higher-resolution image from the top-resolution image, wherein the second higher-resolution image comprises a portion of the image in the fourth resolution;

if the fourth resolution is greater than the second resolution of the top-resolution image, sending a request to the server over the network for a second top-resolution image that has a resolution greater than or equal to the fourth resolution, receiving the second top-resolution image from the server over the network, and generating the second higher-resolution image from the second top-resolution image; and

displaying at least a portion of the second higher-resolution image in the virtual lens.

79. The method of claim 73, further comprising freezing a position of the virtual lens with respect to the lower-resolution image in response to a user command.

80. The method of claim 79, further comprising unfreezing the position of the previously frozen virtual lens with respect to the lower-resolution image in response to a user command.

81. The method of claim 73, further comprising rendering a border around the virtual lens to demarcate the virtual lens from the lower-resolution image.

82. The method of claim 73, wherein displaying the at least a portion of the higher-resolution image comprises rendering the virtual lens such that the virtual lens is centered over the user-indicated position.

83. The method of claim 82, further comprising, whenever the user-indicated position on the display changes:

determining whether at least a portion of the virtual lens would be outside a border of the lower-resolution image if the virtual lens were rendered centered over the user-indicated position;

if at least a portion of the virtual lens would be outside a border of the lower-resolution image, determining an offset location for the virtual lens where the virtual lens would not be outside of the border of the lower-resolution image; and

rendering the virtual lens such that the virtual lens and the at least a portion of the higher-resolution image displayed within it is centered over the offset location and, at the user-indicated position on the display, a point in the higher-resolution image displayed in the virtual lens matches a point in the underlying lower-resolution image.

84. The method of claim 73, further comprising adjusting a size, shape, or position of the virtual lens to improve the function of an application in which the virtual lens is being used.

85. The method of claim 73, further comprising hiding the virtual lens in response to a user command.

86. The method of claim 73, further comprising showing the previously hidden virtual lens in response to a user command.

87. The method of claim 73, further comprising rendering an opaque plane between the virtual lens and the underlying lower-resolution image, wherein the opaque plane can be rendered as visible while waiting to generate the higher-resolution image.

88. The method of claim 73, further comprising:

identifying a resolution that a user is likely to request; and

sending a request to the server for the image at the identified resolution.

89. The method of claim 73, further comprising:

identifying one or more additional images that a user of a client device is likely to request; and

sending a request to the server for the identified one or more additional images in order to preload the images on the client device before the user requests the one or more additional images.

90. The method of claim 73, wherein the higher-resolution image comprises a higher-resolution video and the lower-resolution image comprises a lower-resolution video.

91. The method of claim 90, wherein displaying the at least a portion of the higher-resolution image comprises synchronizing a frame rate and a currently displayed frame of the higher-resolution video with a frame rate and currently displayed frame of the lower-resolution video.

92. The method of claim 73, wherein the top-resolution image is cached in a memory of a client device for later use.

93. The method of claim 73, further comprising:

determining whether the lower-resolution image exceeds the size of a display region of the display;

displaying a portion of the lower-resolution image within the display region;

determining whether the virtual lens has reached an edge of the display region; and

if the virtual lens has reached the edge of the display region, stopping movement of the virtual lens and scrolling the lower-resolution image in an opposite direction as a movement indicated by an input device.

94. The method of claim 93, wherein scrolling the lower-resolution image in the opposite direction as the movement indicated by the input device comprises scrolling the lower-resolution image in the opposite direction as the movement indicated by the input device until the movement indicated by the input device stops or an edge of the lower-resolution image aligns with the edge of the display region.

95. The method of claim 73, wherein the lower-resolution image, the top-resolution image, and the higher-resolution image each comprise a plurality of images.

96. The method of claim 73, wherein, when the third resolution is less than the second resolution, generating the higher-resolution image from the top-resolution image includes downscaling the top-resolution image from the second resolution to the third resolution to create the higher-resolution image.