Adaptive Huffman Coding with Example |Part 1
Part 2: Encoding Procedure
• Adaptive Huffman Coding with Example Part 2
Part 3: Adaptive Huffman Decoding
• Adaptive Huffman Decoding Procedure With E...
In Huffman encoding, it is necessary to already know the frequency or probabilities of source sequence. If it is unknown then Huffman encoding can be done is two passes:
In first pass, we calculate the statistics and in the second pass we encode the sequence. Faller and Gallagher developed adaptive algorithms to convert Huffman code into a single pass procedure based on the statistics of the symbols already encountered. Vitter and Knuth later on improved these algorithms.
So, if we want to encode the (k+1)th symbol using the statistics of first k symbols, we could recompute the code using the Huffman coding procedure each time a symbol is transmitted.
However, this approach was not much appreciated because large computational was involved in it. Hence, the adaptive Huffman encoding scheme was introduced.
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