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

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Presentation transcript:

Environment Matting and Compositing CS 395 – Advanced GraphicsPresented 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 What is Compositing? Holding back the part of the new background that the foreground blocks. Placing the foreground element in a new background

Original Uses Weather ReportsCinema Special Effects

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

How difficult is Matting?

Matte Image

Good Results?

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

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

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

Environment Mattes

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

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

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

Movies!

Importance of Sidedrops Light comes from other parts of the environment

Sidedrop Example

Sidedrop x2

Failure Cases Box-filter Gaussian-weighted Photograph

Failure Cases Composite Photograph Failure of Engineering Failure of Theory

Next Steps Depth Accuracy Real-Time Capture

Progress? Depth Accuracy No Real-Time

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