Combined Symbol Matching-A New Approach To Facsimile Data Compression

Wen-hsiung Chen; John L. Douglas; Robert D. Widergren

doi:10.1117/12.956662

7 December 1978 Combined Symbol Matching-A New Approach To Facsimile Data Compression

Wen-hsiung Chen, John L. Douglas, Robert D. Widergren

Proceedings Volume 0149, Digital Image Processing II; (1978) https://doi.org/10.1117/12.956662
Event: 22nd Annual Technical Symposium, 1978, San Diego, United States

Abstract

Presented here is an efficient facsimile data coding scheme (CSM) which cambines an extended run-length coding technique with a symbol recognition technique. The CSM scheme first partitions the data into run-length regions and symbol regions. The run-length regions are then coded by a modified Interline Coding technique, while the data within the symbol region is further subpartitioned into regions defined as symbols. A prototype symbol library is maintained, and as each new symbol is encountered, it is compared with each element of the library. These comparisons produce a signature for the new symbol. A tolerance threshold is used to evaluate the "goodness" of the comparison. If the tolerance threshold indicates a matching symbol, then only the location and the library address need be transmitted. Otherwise the new symbol is both trans-mitted and placed in the library. For finite sized libraries a scoring system determines which elements of the library are to be replaced by new prototypes. Simulation results are demonstrated for both CCITT and Xerox standard documents.

Citation Download Citation

Wen-hsiung Chen, John L. Douglas, and Robert D. Widergren "Combined Symbol Matching-A New Approach To Facsimile Data Compression", Proc. SPIE 0149, Digital Image Processing II, (7 December 1978); https://doi.org/10.1117/12.956662

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