| 摘要 |
Compression expansion processor apparatus and method is provided for document image processing. The apparatus creates a virtual 1:1 image stream within, and represents this stream logically as a series of run length codes instead of physically as a fully decoded bit stream. The apparatus and method directly compute the required output bit streams from this internal run length representation. The time wasted generating and discarding clipped pixels is eliminated. An input parsing function does not have to recompute the previous line's run lengths. Individual color run lengths are retained through-out the clipping and scaling processes, making gray level correction techniques easier to apply.
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