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Uncompressed graphics, audio, and
video data require substantial storage capacity,
which is not possible in the case
of uncompressed video data, even given today’s CD and DVD technology. The same
is true for multimedia communications. Data transfer of uncompressed video data
over digital networks requires that very high bandwidth be provided for a
single point-to-point communication. To be cost-effective and feasible, multimedia
systems must use compressed video and audio streams.
Most compression methods address
the same problems, one at a time or in combination. Most are already available
as products. Others are currently under development or are only partially
completed. While fractal image compression [BH93] may be important in the
future, the most important compression techniques in use today are JPEG for
single pictures, H.263 for video, MPEG for video and audio, as well as proprietary
techniques such as QuickTime from Apple and Video for Windows from Microsoft.
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