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FULLDOME STANDARDS SUMMIT IPS 2004

FULLDOME STANDARDS SUMMIT IPS 2004. Standardize Show Creations. SUMMARY. Video: Projection System Specifications Images: Rendering, Resolution, Splitting Sound: Reproduction systems, exchange format. Video: Projection System Specifications. Video standards Projection System Resolution

larissa-carpenter
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FULLDOME STANDARDS SUMMIT IPS 2004

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  1. FULLDOME STANDARDS SUMMITIPS 2004 Standardize Show Creations

  2. SUMMARY • Video: Projection System Specifications • Images: Rendering, Resolution, Splitting • Sound: Reproduction systems, exchange format

  3. Video: Projection System Specifications • Video standards • Projection System Resolution • Projection System Frequency

  4. Video Standards • PAL/SECAM 720*576 25fps • NTSC 720*480 30fps • HDTV ->16/9 Format not adapted to 4/3 models used

  5. Projection System Resolution • Graphical Channel: • Projector • DLP 1280 * 1024 (SXGA) • CRT 3200 * 2560 • Computer • Graphical Card 2048 * 1536 • MicroProcessor • Video 1600 * 1200 (UXGA) • Real Time 1600 * 1200 (UXGA)

  6. Projection System Frequency • Computer Frequency (cinema 24fps) • 25fps (Historically ->PAL) • 30fps (Historically ->NTSC) • Projection Frequency • 75Hz • adapted to 25fps (cycle 3) • 30fps acceptable to broadcast (cycle 3-2) • 60Hz • adapted to 30fps (cycle 2) • 25fps difficult to broadcast (cycle 3-2-3-2-2)

  7. Resolution, Frequency and Rendering Time • Rendering Time according to the resolution Average on a P4 2.4GHz mono-processor • Rendering at 25fps instead of 30fps allows a 20% reduction of rendering time and image storage

  8. Images: Rendering, Resolution, Splitting • Fish-Eye Image Generation • Fish-Eye Resolution Approach • Fish-Eye Image Splitting

  9. Fish-Eye Image Generation • Direct Fish-Eye Rendering • Hemi-cubic Rendering • Camera Rendering

  10. Fish-Eye Resolution Approach • Effective Pixels of the Projection System • Number of Channels * Video Resolution - 20% of soft-edge • Effective Pixels of the Fish-Eye image (square image) • Area in pixels of the circle in « Image Height » diameter • 10% Increase

  11. Fish-Eye Image Splitting • To obtain a Fish-Eye image with one file per channel • Special Software creation • Necessity to standardize the different projection configurations • Number of projectors • Hemispherical Screen Covering (165°, 170°, 180°) • Camera Parameters

  12. Sound: Reproduction System, Exchange Format • Sound Reproduction Systems • File Format and Exchange

  13. Reproduction Systems • 5 + 1 • 7 + 1 • Others… -> Loudspeaker standardization for a sound with the same quality anywhere in the dome

  14. Files Format and Dispatching • PCM 48KHz (mono file: around 125Mb for 25 minutes) • Supplying of (= around 3.75 Gb): • 7+1 with voice OV: 8 mono files • 5+1 with voice OV: 6 mono files • 7+1 without voice: 8 mono files • 5+1 without voice: 6 mono files • OV Voice: 1 stereo file

  15. Conclusion To Define a Standard: • To take into account the world market specifications • The market must not adapt itself to the standard, but the standard must adapt itself to the market • It must be always possible to adapt a standardized show to a non standard planetarium

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