Section 4 of the BYO3D SIGGRAPH 2010 Course

2. Representation and Display

3. Glasses-bound Stereoscopic Displays

6. Refracting lenslet arrays [Lippmann, 1908]

7. Barriers cause severe attenuation  dim displays

8. Lenslets impose fixed trade-off between spatial and angular resolutionHow to select mask/lenslet properties and generate base images?

10. Lenslets are linear array of cylindrical lenses (i.e., a lenticular sheet)Depth perception not supported when viewed “sideways”

12. Lenslets consist of a 2D array (i.e., a “fly’s eye" lens array)Requires additional views slower rendering and lower resolution Pinholes furtherreduce brightness of parallax barrier displays

16. Supports oblique projections (i.e., skewed orthographic cameras)

18. Practically, this is only achieved with custom-manufacturedlenslets

21. Must define offset between lenslet array and screen (calibration error)

22. First, evaluate closest lenslet for each pixel  spatial imagesample

23. Second, evaluate offset from lenslet center  angular viewpointAntialiasing by oversampling (i.e., average samples in each pixel)

24. Interlacing Content: MATLAB Demonstration

26. Can interpret as a moiré magnifier [Hutley et al., 1994]

27. Viewing an array of images through lenslets produces magnified images

28. Relative pitch/orientation determines scaling/rotation of magnified imagesM. C. Hutley , R. Hunt , R. F. Stevens and P. Savander.The Moiré Magnifier.Pure and Applied Optics, 1994

30. Place lenticular sheet in direct contact with the screen

32. Place lenticular sheet in direct contact with the screen

35. Generate an interlaced image (one white pixel below each lens)

36. When calibration is correct, no magnified stripes will be visible (i.e., screen is white when directly in front of display, otherwise black)

38. Generate an interlaced image (one white pixel below each lens)

39. When calibration is correct, no magnified stripes will be visible (i.e., screen is white when directly in front of display, otherwise black)

41. Generate an interlaced image (one white pixel below each lens)

42. When calibration is correct, no magnified stripes will be visible (i.e., screen is white when directly in front of display, otherwise black)

44. Generate an interlaced image (one white pixel below each lens)

45. When calibration is correct, no magnified stripes will be visible (i.e., screen is white when directly in front of display, otherwise black)

47. Generate an interlaced image (one white pixel below each lens)

48. When calibration is correct, no magnified stripes will be visible (i.e., screen is white when directly in front of display, otherwise black)

50. Generate an interlaced image (one white pixel below each lens)

51. When calibration is correct, no magnified stripes will be visible (i.e., screen is white when directly in front of display, otherwise black)

53. Interlaced base images were generated for the “numbers” sequence

54. Results confirm motion parallax up to ten views with the prototype (i.e., 20 LPI lenticular sheet and 100 DPI screen  10 views)

56. Interlaced base images where generated for the “photos” sequence

57. Results confirm motion parallax up to ten views with the prototype (i.e., 20 LPI lenticular sheet and 100 DPI screen  10 views)

59. [1]Paper vellum diffuser (e.g., ClearPrint 11"x17" Vellum Pad) [$15]

64. Generate an interlaced image (one “marker” pattern below each lens)

65. When calibration is correct, no magnified “markers” will be visible (i.e., screen is uniform color when directly in front of display)

67. Generate an interlaced image (one “marker” pattern below each lens)

68. When calibration is correct, no magnified “markers” will be visible (i.e., screen is uniform color when directly in front of display)

70. Results confirm motion parallax up to 8x8 views with the prototype (i.e., 0.09 inch lenslet diameter and 90 DPI screen  8x8 views)

71. Results: Light Field (Toy Humvee and Soldier) viewer moves right Sample Image viewer moves up

72. Results: Interlaced Image (Toy Humvee and Soldier)

73. Results: Light Field (Tarot Cards and Crystal Ball) viewer moves right viewer moves up Sample Image

74. Results: Interlaced Image (Tarot Cards and Crystal Ball)

76. [1]Paper vellum diffuser (e.g., ClearPrint 11"x17" Vellum Pad) [$15]

78. [1]Paper vellum diffuser (e.g., ClearPrint 11"x17" Vellum Pad) [$15]

80. Dynamic barriers can eliminate resolution loss

82. Dynamic barriers can eliminate resolution loss

84. Dynamic barriers can eliminate resolution loss

85. Must translate faster than flicker fusion threshold (i.e., 60 Hz)While eliminating resolution loss, display is still dim

86. LCD Disassembly: Removing the Case

87. LCD Disassembly: Removing the Case

88. LCD Disassembly: Removing the Case

89. LCD Disassembly: Separating the Power Supply

90. LCD Disassembly: Separating the Power Supply

91. LCD Disassembly: Separating the Controller Board

92. LCD Disassembly: Removing the Backlight

93. LCD Disassembly: Removing the Diffusing/Polarizing Films

94. LCD Disassembly: Cleaning the Spatial Light Modulator

95. Assembled Dual-Stacked LCD Barrier Display Dual-Stacked LCD Construction Rear LCD panel and backlight (unmodified) Plastic spacer Front LCD panel (modified) Replacement linear polarizing sheet

96. Interlacing Content: MATLAB Demonstration Interlaced (Rear) Image (1 of 9) Pinhole Array (Front) Image (1 of 9)

98. Each panel connected via DVI (driver ensures synchronization)

100. A sequence of nine time-shifted pinhole arrays were displays

101. Results confirm motion parallax with 3x3 views for the prototype (effective refresh rate is 120 Hz / 9 = 13.3 Hz)

103. Representation and Display

104. Glasses-bound Stereoscopic Displays

105. Unencumbered Automultiscopic Displays

106. Source Material: Rendering and Capture

107. Emerging Technology

108. Conclusion and Q & A