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Adaptive Huffman Coding
Huffman coding suffers from the fact that the uncompresser need
have some knowledge of the probabilities of the characters in the
compressed files. Not only can this add somewhat to the bits
needed to encode the file, but, if this crucial piece of knowledge
is unavailable, compressing the file requires two passes- one pass
to find the frequency of each character and construct the huffman
tree and a second pass to actually compress the file. Expanding
on the huffman algorithm, Faller and Gallagher, and later Knuth
and Vitter, developed a way to perform the huffman algorithm as a
one pass procedure.
http://ift.tt/1lRxCr1
http://ift.tt/UnpIQx
Huffman coding suffers from the fact that the uncompresser need
have some knowledge of the probabilities of the characters in the
compressed files. Not only can this add somewhat to the bits
needed to encode the file, but, if this crucial piece of knowledge
is unavailable, compressing the file requires two passes- one pass
to find the frequency of each character and construct the huffman
tree and a second pass to actually compress the file. Expanding
on the huffman algorithm, Faller and Gallagher, and later Knuth
and Vitter, developed a way to perform the huffman algorithm as a
one pass procedure.
http://ift.tt/1lRxCr1
http://ift.tt/UnpIQx
from Public RSS-Feed of Jeffery yuan. Created with the PIXELMECHANICS 'GPlusRSS-Webtool' at http://gplusrss.com http://ift.tt/1lRxEiE
via LifeLong Community
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