 P Hanrahan & M Levoy “Pulling a Matte” - Matte Creation From digitized images o Blue-screen matting (Petro Vlahos) Separate blue background from foreground.

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Presentation transcript:

 P Hanrahan & M Levoy “Pulling a Matte” - Matte Creation From digitized images o Blue-screen matting (Petro Vlahos) Separate blue background from foreground image o Video or chroma-keying Range of chromaticities marked transparent o Image processing Set of colors marked transparent, region growing...

 P Hanrahan & M Levoy Pulling a Matte Using Blue Screening

 P Hanrahan & M Levoy Sportvision’s 1 st -and-10 line chroma-keys off green grass (or other colors) hard if uniforms match background (markings, snow,...) must track cameras, know shape of field (it’s not flat!)

 P Hanrahan & M Levoy Matte extraction is an active research area Natural Video Matting using Camera Arrays, N Joshi, W Matusik, S Avidan, Proc. SIGGRAPH 2006

 P Hanrahan & M Levoy “Pulling a Matte” - Matte Creation From digitized images o Blue-screen matting (Petro Vlahos) Separate blue background from foreground image o Video or chroma-keying Range of chromaticities marked transparent o Image processing Set of colors marked transparent, region growing... From computer generated images o Coverage o Transparency

 P Hanrahan & M Levoy Porter-Duff Compositing Algebra C’ = F A C’ A +F B C’ B OpenGL blendfunction Specify src and dst F’s 0, 1, As, Ad, 1-As, 1-Ad, min(As,1-Ad), Cs, Cd, 1-Cs, 1-Cd,

 P Hanrahan & M Levoy Painting – how are each of these strokes done?

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