10. The apparatus of claim 1 , wherein: the stripe image comprises a previous stripe image and a current stripe image; the matching unit matches the symbols of the current stripe image with the symbol dictionary of the previous stripe image; and the dynamic symbol caching unit generates the one or more new symbols of the symbols of the current stripe image when the one or more new symbols of the symbols of the current stripe image are not included in the reference symbols of the symbol dictionary of the previous stripe image, and to remove the least used one or more of the reference symbols, so that the symbol dictionary is updated as the updated symbol dictionary with the one or more new symbols and without the least used one or more reference symbols.
10. The apparatus of claim 1 , wherein: the stripe image comprises a previous stripe image and a current stripe image; the matching unit matches the symbols of the current stripe image with the symbol dictionary of the previous stripe image; and the dynamic symbol caching unit generates the one or more new symbols of the symbols of the current stripe image when the one or more new symbols of the symbols of the current stripe image are not included in the reference symbols of the symbol dictionary of the previous stripe image, and to remove the least used one or more of the reference symbols, so that the symbol dictionary is updated as the updated symbol dictionary with the one or more new symbols and without the least used one or more reference symbols. 11. The apparatus of claim 10 , wherein: the stripe image comprises a next stripe image; the matching unit matches the symbols of the next stripe image with the reference symbols of the updated symbol dictionary of the current stripe image; and the dynamic symbol caching unit generates one or more new symbols of the symbols of the next stripe image when the one or more new symbols of the symbols of the next stripe image are not included in the reference symbols of the updated symbol dictionary of the current stripe image, and to remove the least used one or more of the reference symbols from the reference symbols of the updated symbol dictionary of the current stripe image, so that the updated symbol dictionary is updated as another updated symbol dictionary with the one or more new symbols of the next stripe image and without the least used one or more reference symbols of the updated symbol dictionary.