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“Pulling a Matte” - Matte Creation

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

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“Pulling a Matte” - Matte Creation

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

  2. Pulling a Matte Using Blue Screening

  3. Sportvision’s 1st-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!)

  4. Matte extraction is an active research area • Natural Video Matting using Camera Arrays,N Joshi, W Matusik, S Avidan,Proc. SIGGRAPH 2006

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

  6. Porter-Duff Compositing Algebra C’ = FAC’A+FBC’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,

  7. Painting – how are each of these strokes done?

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