LZ78 Compression
Contents
LZ78 is a lossless compression algorithm to reduce the size of a repetitive string.
This is done with a dictionary, where previously captured fields can be referenced by their positional index.
Indexes start at ZERO (0)
To decode the codeword (0, c)(0, a)(2, a)(3, b)(4, c)(4, b)
, start with the empty
dictionary.
output | new dictionary entry |
---|---|
c | 1. c |
a | 2. a |
aa | 3. aa |
aab | 4. aab |
aabc | 5. aabc |
aabb | 6. aabb |
The decoded text is caaaaabaabcaabb