Abstract :
In this paper, we investigate the problem of transmitting
embedded encoded object-oriented images over the packeterasure
networks. After giving a review of the existing combined
unequal error protection (CUEP) and individual unequal error protection
(IUEP) schemes, a novel weighted unequal error protection
(WUEP) packetization scheme is proposed, which serves as an alternative
to the existing methods. In our proposed framework, the
embedded bitstreams of all concerned image objects are packetized
into multiple description packet streams before transmission. Two
levels of rate allocation are introduced: intraobject rate allocation
provides unequal error protection to the embedded bitstream of
each object and minimizes its associated mean distortion; interobject
rate allocation aims at minimizing the weighted mean distortion
by adaptively allocating the rate budget among different objects
according to their importance. Furthermore, our proposed packetization
scheme ensures independent access and manipulation of
individual image object. A detailed comparison between CUEP,
IUEP, and WUEP is presented along with the experimental results,
so that one can choose the most suitable approach according to the
requirements.
