20. An apparatus to code a text image using a pattern matching method in a text image coding and decoding system, comprising: a decomposer to decompose image data to extract a stripe image having one or more symbols with information on access events corresponding to the respective symbols; a pattern matching unit to match the symbols with reference symbols of a symbol dictionary; and a dynamic symbol caching unit to generate one or more new symbols when the one or more new symbols of the symbols are not included in the symbol dictionary, and to remove one or more of the reference symbols having the least one of the access events, so that the symbol dictionary is updated as an updated symbol dictionary with the one or more new symbols and without the one or more of the reference symbols having the least access event.
20. An apparatus to code a text image using a pattern matching method in a text image coding and decoding system, comprising: a decomposer to decompose image data to extract a stripe image having one or more symbols with information on access events corresponding to the respective symbols; a pattern matching unit to match the symbols with reference symbols of a symbol dictionary; and a dynamic symbol caching unit to generate one or more new symbols when the one or more new symbols of the symbols are not included in the symbol dictionary, and to remove one or more of the reference symbols having the least one of the access events, so that the symbol dictionary is updated as an updated symbol dictionary with the one or more new symbols and without the one or more of the reference symbols having the least access event. 21. The apparatus of claim 20 , wherein the one or more of the reference symbols having the least one of the access events comprise the one or more of the reference symbols having the least used symbol.