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Environment Matting and Compositing

Environment Matting and Compositing. CS 395 – Advanced Graphics Presented by Jay Hetler Douglas E. Zongker ~ Dawn M. Werner ~ Brian Curless ~ David H. Salsin. What is Matting? Extracting the foreground image from the background Describing the opacity of the foreground at every point.

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Environment Matting and Compositing

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  1. Environment Matting and Compositing CS 395 – Advanced Graphics Presented by Jay Hetler Douglas E. Zongker ~ Dawn M. Werner ~ Brian Curless ~ David H. Salsin

  2. What is Matting? • Extracting the foreground image from the background • Describing the opacity of the foreground at every point • What is Compositing? • Holding back the part of the new background that theforeground blocks. • Placing the foreground element in a new background

  3. Original Uses Weather Reports Cinema Special Effects

  4. Matting Equation C = F + (1- a)B • C ~ Color • F ~ Foreground color • B ~ Background color • a ~ Amount of light that passes through the foreground

  5. How difficult is Matting?

  6. Matte Image

  7. Good Results?

  8. Problems with Matting Images do not look realistic • Lack of Refracted Light • Lack of Reflected Light Solution: Modify the Matting Equation

  9. Environment Matting Equation C = F + (1- a)B + F • C ~ Color • F ~ Foreground color • B ~ Background color • a ~ Amount of light that passes through the foreground • F ~ Contribution of light from Environment that travels through the object

  10. Explanation of F m S F = R M(T , A ) i i i i = 1 R ~ Reflectance coefficient M ~ Texture mapping operator for axis-aligned rectangle (A) of texture (T)

  11. Environment Mattes

  12. Performance • Calibration • Matting: 10-20 minutes extraction time for each texture map (Pentium II 400Mhz) • Compositing: 4-40 frames per second • Real-Time?

  13. How much better is Environment Matting? Alpha Matte Environment Matte Photograph

  14. How much better is Environment Matting? Alpha Matte Environment Matte Photograph

  15. Movies!

  16. Importance of Sidedrops Light comes from other parts of the environment

  17. Sidedrop Example

  18. Sidedrop x2

  19. Failure Cases Box-filter Gaussian-weighted Photograph

  20. Failure Cases Failure of Engineering Failure of Theory Composite Photograph

  21. Next Steps • Depth • Accuracy • Real-Time Capture

  22. Progress? Depth Accuracy No Real-Time

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