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Viewing report
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A Solution for Natural Video Matting. Edition No. 1
VDM Publishing House, April 2009, Pages: 60
The problem of extracting an object from an image,
known as “image matting,” has been deeply
investigated in the last two decades. Its extension
to address video, i.e., “video matting,” has gained
less attention. This paper studies the difficulties
that should be addressed when extending image matting
methods to work on video. In particular we address
the following problems: (i) While the required user
intervention is reduced over the years, it still
remains unpractical to manually provide user marks on
every frame; (ii) the temporal continuity of a video
sequence suggests that it may be beneficial to solve
the matting equations for the entire video
simultaneously. This, however, is impractical due to
memory constraints; (iii) because of the huge size of
input data, interactive results update is not
trivially plausible. To cope with these difficulties,
we exploit video continuity. Temporal continuity is
used to propagate user provided hints, while spatial
continuity is used to reduce the number of unknowns
and the number of constraints. Finally, we apply an
incremental matrix factorization to allow real-time
insertion of new user-provided constraints.
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