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Far Field Video

Far Field Video. Andy Wilson COMP290-72 Final Presentation. Motivation. Accelerate massive model rendering by representing distant geometry with simple impostor Use MPEG encoding to take advantage of coherence between impostors for adjacent cells. State of the Art.

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Far Field Video

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  1. Far Field Video Andy Wilson COMP290-72 Final Presentation

  2. Motivation • Accelerate massive model rendering by representing distant geometry with simple impostor • Use MPEG encoding to take advantage of coherence between impostors for adjacent cells

  3. State of the Art • Massive model rendering: the Walkthrough MMR system • Video representation: numerous techniques (MPEG1-3, Intel Indeo, H.263, etc.) • Far-field representations: image-based impostors (TDM, LDI, QTVR, etc.)

  4. Goals • Automatically find paths through a model • Generate video stream from those paths • Allow bidirectional motion through image stream • Integrate video into viewer

  5. Major Setbacks • Freely available video codecs (with source) are difficult to adapt • Bidirectional stream navigation requires a lot of work • Inter-frame dependencies make random access difficult • Many cryptic parameters in encoder have large effect on quality of output

  6. Sample Loss of Quality MPEG Normal (PNG)

  7. Future Work • Better paths through model • more coherence means better images, smaller streams • Problem known to be NP-complete! • Bidirectional navigation • Probably requires complete rewrite of MPEG decoder • Other representations • panorama, cell-wall movie, ?

  8. Demo: MMR with video images

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