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Tyler Johnson and Henry Fuchs University of North Carolina – Chapel Hill

A Unified Multi-Surface, Multi-Resolution Workspace with Camera-Based Scanning and Projector-Based Illumination. Tyler Johnson and Henry Fuchs University of North Carolina – Chapel Hill. IPT/EGVE July 18, 2007 - Weimar, Germany. Multi-Projector Display. Previous Work. Workspace Configuration.

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Tyler Johnson and Henry Fuchs University of North Carolina – Chapel Hill

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  1. A Unified Multi-Surface, Multi-Resolution Workspace withCamera-Based Scanning and Projector-Based Illumination Tyler Johnson and Henry Fuchs University of North Carolina – Chapel Hill IPT/EGVE July 18, 2007 - Weimar, Germany

  2. Multi-Projector Display

  3. Previous Work

  4. Workspace Configuration

  5. Encoded Structured Light Workspace Walls LCD Panel Calibration • Cameras pre-calibrated • Project structured light to determine • Projector calibration • Workspace geometry • RANSAC-based plane-fitting. [Quirk EDT ’06] • Also, display structure light with LCD • Calibrate as a projector

  6. Projector Viewer Two-Pass Rendering • Determine image warping to remove distortion caused by surface geometry Display Surface

  7. Single vs Multi-Surface Content • Two methods of display • Single vs. multi-surface

  8. Single Surface Content • User selects region where the window should appear • Compute P-Matrix from 3D->2D corner correspondences • Choose arbitrary COP • Two-pass rendering determines what to project

  9. Multi-Surface Content • Same as for single surface, except that COP is user viewpoint • Viewpoint can be obtained from separate tracking system

  10. Projector-Based Illumination • Projection of imagery onto certain objects is often undesirable • Simple interface allows imagery to be replaced with illumination

  11. Camera-Based Scanning • User selects copy area with selection window • Selection window rendered as a single-surface window

  12. Camera-Based Scanning • Remove perspective distortion using two-pass rendering Selection window Selection window P-matrix Camera

  13. Video

  14. Contributions • Two-pass rendering as a unifying framework for digital workspaces • Image generation • Rectified single surface imagery • Perspectively correct multi-surface imagery • Camera-based scanning • Removal of perspective distortion • LCD panel as a projector • Simplifies calibration/rendering

  15. Future Work • Automatic object illumination • Camera-based detection of objects occluding projection • Improved scanning resolution • Trigger optical zoom, multi-camera super-resolution etc. • Continuous calibration • Online calibration monitoring and refinement

  16. Thank You • Funding support: ONR N00014-03-1-0589 • DARWARS Training Superiority program • VIRTE – Virtual Technologies and Environments program

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