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What is the difference between lz77 and lz78 in data compression?

Anonymous

∙ 12y ago

Updated: 9/18/2023

y dnt u find it.....urslf

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∙ 12y ago

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Related Questions

When using LZ77 why is the compressed message longer than the decompressed version?

Dictionary coders (such as LZ77) store a segment of the message in a dictionary, and then replace each occurrence with the index into the dictionary. This works very well for repeated values, or messages that use a small portion of the possible values (such as 26 letters out of the 256 possible values in a byte). However, if the data does not repeat, or uses almost all of the possible values randomly, there will be the space used for the dictionary PLUS the space used for indexes of single occurrences. This can make the message longer. In general terms, if the message entropy is too high, any lossless compression scheme will fail to compress the data.

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