“Improved Chromakey of Hair Strands via Orientation Filter Convolution” by LeGendre, Krissman and Debevec
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Entry Number: 62
Title:
- Improved Chromakey of Hair Strands via Orientation Filter Convolution
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Abstract:
We present a technique for improving the alpha matting of challenging green-screen video sequences involving hair strands. As hair strands are thin and can be semi-translucent, they are especially hard to separate from a background. However, they appear as extended lines and thus have a strong response when convolved with oriented filters, even in the presence of noise. We leverage this oriented filter response to robustly locate hair strands within each frame of an actor’s performance filmed in front of a green-screen. We demonstrate using production video footage that individual hair fibers excluded from a coarse artist’s matte can be located and then added to the foreground element, qualitatively improving the composite result without added manual labor.
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Acknowledgements:
The authors wish to thank Randy Hill, Kathleen Haase, Angelika Von Chamier, and Michael Trejo for their important support of this work. This project was sponsored by the U.S. Army Research Laboratory (ARL) under contract W911NF-14-D-0005 and in part by a USC Annenberg Ph.D. Fellowship. The content of the information does not necessarily reflect the position or the policy of the Government, and no official endorsement should be inferred.
