in includes backwar and baum-welch algorithms

TIFF Library. Rev 5.0 Lempel-Ziv & Welch Compression Support Source Code for Linux.

Lempel–Ziv–Welch (LZW) is a universal lossless data compression algorithm created by Abraham Lempel, Jacob Ziv, and Terry Welch. It was published by Welch in 1984 as an improved implementation of the LZ78 algorithm published by Lempel and Ziv in 1978