LOSS-LESS COMPRESSION AND DECOMPRESSION OF BITMAPS
专利汇可以提供LOSS-LESS COMPRESSION AND DECOMPRESSION OF BITMAPS专利检索，专利查询，专利分析的服务。并且In compression of a binary bitmap of a symbol, in order to achieve a high compression ratio, a development of run-length encoding is employed in which the symbol is considered as being made up of a plurality of strokes, and each stroke is considered as being made up of a plurality of continuous lines. Each stroke is encoded by encoding each line or group of lines of that stroke by one of a plurality of encoding methods to form a line code; and presenting the line codes as a stream in the order in which the lines appear in that stroke, at least some of the lines each being encoded in dependence upon their position and length relative to the preceding line in that stroke. The streams of the line codes for the strokes are then presented in sequence as a set. The separation of the symbol into a plurality of strokes removes the need to encode the white space between those strokes, as it can be inferred to be background. By contrast, with simple run-length encoding, such white space tends to produce long variable-length runs which do not compress well. By suitable choice of the encoding methods, specific features of symbols (or parts them) can be taken into account to produce a compression ratio which is perhaps more than twice that which is achievable using simple run-length encoding. Many symbols have a high degree of correlation between vertically adjacent horizontal pixel rows, even after splitting into a plurality of strokes, and this can be taken advantage of to produce high compression ratios.，下面是LOSS-LESS COMPRESSION AND DECOMPRESSION OF BITMAPS专利的具体信息内容。
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