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‘ Office of the Future’ Research

‘ Office of the Future’ Research. Department of Computer Science University of North Carolina - Chapel Hill February 24, 2000 Henry Fuchs - PI Greg Welch and Herman Towles. Presentation Outline. ‘Office of the Future’ Vision Projector Applications Projector Wish List.

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‘ Office of the Future’ Research

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  1. ‘Office of the Future’ Research Department of Computer Science University of North Carolina - Chapel Hill February 24, 2000 Henry Fuchs - PI Greg Welch and Herman Towles

  2. Presentation Outline • ‘Office of the Future’ Vision • Projector Applications • Projector Wish List

  3. ‘Office of the Future’ Vision

  4. Our Goals Pixels Everywhere High Resolution Install in most any room Minimal alignment and maintenance 3D Scene Extraction 3D Head-tracked Stereo Our Focus Projectors for display to achieve image size and numbers of pixels Front-Projection Closed-loop geometric and photometric calibration permitting casual alignment and overlapping display ISL using same projectors & cameras OOTF Research Directions

  5. Steps Along the Way! • OfficeNow! • 2D Surround • Head-Tracked, 3D Panoramic Display • Re-configurable Video Wall • Scene Extraction using Imperceptible Structured Light • Shader Lamps • Stereo Tele-Collaboration - Office2000

  6. Dr. Gary Bishop’s OfficeNow!

  7. 2D & 3D Overlapping Projectors

  8. Structured Light

  9. Shader Lamps

  10. ‘Office of the Future’ 2000

  11. Projector Experience • nView D700Z 800x600 DLPx1 • TI DLP Kit 640x480 DLPx1 • TI DLP Kit 800x600 DLPx1 • Sharp XG-3000U 1024x768 LCDx3 • Electrohome Vista 1024x768 DLPx3 • NEC 1030 & 1035 1024x768 LCDx3 • Sharp NV7 1024x768 DLPx1 • Sony X600 1024x768 LCDx3 • Proxima DP-6850 1024x768 LCDx3

  12. Projector Wish List • Geometric Control • Photometric Control • Stereo Operation • Imperceptible Structured Light • Re-configurable / Front-projection Issues • Miscellaneous

  13. Challenge Framing & digitization of Analog Video RGB Convergence Optic Parameters - intrinsics Lens Distortion Opportunity Digital Interfaces - no PLL Tighter specifications Documentation on optics subsystem Digital Distortion Correction Geometric Control

  14. Challenge Gamma Response . Display Field Uniformity Color Gamut Match . . Matching Black & White Opportunity Linear & Programmable, 10-bit RGB channels Better than 90% [3x3] color transform, compensation for bulb aging Consistent Black Level & Contrast Controls, plus programmable LUT Photometric Control:Side-by-Side Projectors

  15. Challenge Intensity Blending . . Matching Black & White - more complex in the overlap case Opportunity Incorporate display resolution alpha buffer, 8-bit minimum Minimize problem with muchbetter blacks or incorporate CLUT that is indexed by RGBin and a 4-bit overlap buffer. Photometric Control: Overlapping Projectors

  16. 4-Bit Overlap Buffer 16x1024 LUT 10-bit RGB in 10-bit RGB out 16x1024 LUT 16x1024 LUT Overlap Buffer D A C B Area Level A 1x B 2x C 3x D 2x

  17. A ‘GP’ Processing Pipeline 4-Bit Overlap Buffer Lens Distortion Correction 3 x 3 RGB Transform Color LUTs X  LUTs Alpha Buffer Photometric Correction Blending Gamma Geometry Correction

  18. Challenge 1 Projector - Time Sequential Frames - Active Glasses 2 Projectors - Passive Glasses Planar Polarized Light + 1/4 Retarder -> Circularly Polarized Light Opportunity Needs faster frame rates 120+ Hz DLP 50KHz binary frame rate -> 180Hz 8-bit frame rate + RGBW sync out New reflective LCDs are fast Need same planar polarization on all LCDs Sharp XG-3000 all same New LCD projectors have R and B different from G Stereo Operation

  19. Challenge Projecting an Invisible Frame that a Camera can capture Used for 3D scene extraction and geometric calibration of system array We have modified early DLP engines to display ISL patterns in gray -scale imagery and white light Opportunity IR/UV Projector and Sensor Hide in visible illumination with very short frame time Requires external camera trigger Desirable to have separate ISL frame input rather than mixing with visible frame Or just dedicate separate projectors to ISL task Imperceptible Structured Light

  20. Challenge Power Zoom & Focus . . Zoom Lens Options Standard HFOV 24º - 32º too wide Depth of Field (Focus) Oblique Projections Problematic Opportunity Closed-loop positioning would be great! (Cmd. Zoom = 47mm) Modular design Balance between brightness (big aperture) and Depth of Focus (small aperture) Re-Configurable & Oblique Projection

  21. Challenge Low Noise Optical Efficiency Single Digital Interface for video, alpha, overlap and control Opportunity Getting better Lumens:Watts Ratio Industry Forum Miscellaneous Factors

  22. Advanced Display Requires • Multi-channel Image Generators • Synchronized output and frame swap • Advanced System Software • Unified Virtual Display Device A ‘Chicken & Egg’ Problem?

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