Digital Signal Processing Reference
In-Depth Information
7. CONCLUSION
The MPEG-4 standard has established itself as the standard syntax
for the first major step in content-based processing (e.g. cut and paste
functionality, synthesis, query, etc.) [Committee, 1998]. The MPEG-4
standard supports the object-based coding of a video sequence, i.e., video
objects, the partitioning of the video sequence into spatio-temporal re-
gions that correspond to meaningful objects within the video sequence.
This chapter implements the major enabling technology for this stan-
dard, a system for video object segmentation. We combine Voronoi
Order and a surface optimization problem formulation for automatic
video object segmentation. Voronoi Order describes a boundary search
space given initial rough estimate of the object from optical flow. Our
surface optimization formulation provides a fitness measure for object
boundaries in the video sequence. By simultaneously maintaining an in-
variant Voronoi Order and maximizing the surface optimization metric,
we extract the video objects. We analyze the results both qualitatively
and objectively.
These extracted video objects are of marginal use unless users have
some way of finding and browsing through them. In Chapter 5 and
Chapter 6, we now turn to the problem of how to represent and search
these video objects in order to allow users to find their desired video
content.
Search WWH ::
Custom Search