| 摘要 |
An apparatus for compressing and expanding digital data including a compressor module for compressing original data and an expander module for expanding the compressed data to substantially recover the original data. The compressor module includes a reduced resolution data set (RRDS) generator providing low pass filtering and decimation (down sampling) of the original data, and a one-dimensional delta pulse code modulation (DPCM) compressor performing either three or four bit encoding on the data output from the RRDS generator. The expander module includes a DPCM expander performing either three or four bit decoding of the data output from the compressor module, an RRDS expander providing interpolation (up-sampling) of the expanded data output from the DPCM expander, and an edge enhancement filter for processing the data output from the RRDS expander to correct for any RRDS introduced signal and texture errors. Optionally, bypass of the RRDS functionality in both the compressor and expander modules may be selected.
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