1.3. Data Compression

A ninety minute uncompressed video clip digitized in High Definition Television (HDTV) format at 1.2 gigabits per second (Gb/s) requires 791 GByte of storage. Even though modern storage devices, such as magnetic disk drives, provide large storage capacities, it might not be economical to store SM objects uncompressed. Moreover, the data transfer rate of magnetic disks is not high enough to retrieve multiple high bit rate objects in real time. A more serious problem arises when transferring a large number of SM objects over the network. Even though network speeds are rapidly increasing, it is not economically feasible to handle the simultaneous display of a large number of SM objects over existing networks.

To resolve these ...

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