Digital Signal Processing Reference
In-Depth Information
Figure 7.2.
The MPEG-4 and MPEG-7 Synergy
:
using knowledge database, we
can obtain better segmentation results. In turn, this improvement therefore can be
propagated into the knowledge database.
message, the transcoder may decide not to send the MPEG-4 video ob-
ject of the background of the video phone message due to the bandwidth
limitations. If the bandwidth becomes further limited, the transcoder
can realize that the video itself may optional and send only the audio
message. If the bandwidth is even further limited or the receiver view-
ing hardware is a pager, the encoder may choose to send an MPEG-7
text stream. Combining the MPEG-4 object-addressable video content
with the MPEG-7 content description, the transcoder has all the nec-
essary information to optimize the presentation of content. Even when
the UMA syntax is fixed in the MPEG-7 standard, there will still be
challenging areas of future research: the different strageties of reducing
bitrate in the compressed domain without sacrificing content and the
adaptive decision process of the transcoder to optimally allocate bitrate
budget w.r.t. content.
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