lecture11 - CSE 471 Media Processing and Multimedia...

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1 CSE 471 Media Processing and Multimedia Compositing Combining two or more images to make a new image Focus: Chromakeying The Art and Science of Digital Compositing , Ron Brinkmann, Morgan Kaufmann, 1999
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2 CSE 471 Media Processing and Multimedia What we want to do… Matte – An image that determines how two images are to be mixed Values range from 0 to 1 0: All of image A 1: All of image B C O = (1- α )C A + α C B Computer people call these “alpha maps”
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3 CSE 471 Media Processing and Multimedia Terms from the bis. .. “Pulling a matte” – Extracting a matte from an image Static matte – A fixed matte for a still image. Can even be hand-painted Traveling matte – Matte sequence from an image sequence Animation
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4 CSE 471 Media Processing and Multimedia Luma-keying Keying based only on the image luminance α = a 1 c α is clamped to [0., 1.] Think of this shorthand as: 2200 α( x,y) = a 1 c(x,y)
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5 CSE 471 Media Processing and Multimedia Lumi-keying
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lecture11 - CSE 471 Media Processing and Multimedia...

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