In each step the LZSS algorithm sends either a character or a pair. Among these, perhaps character "e" appears more frequently than "x", and a pair of length 3 might be commoner than one of length 18, say. Thus, if we encode the more frequent in fewer bits and the less frequent in more bits, the total length of the encoded text will be diminished. This consideration suggests that we use Huffman or arithmetic coding, preferably of adaptive kind, along with LZSS.-In each step the LZSS algorithm sends either a character or a lt;position, lengthgt; pair. Among these, perhaps character "e" appears more frequently than "x", and a lt;position, lengthgt; pair of length 3 might be commoner than one of length 18, say. Thus, if we encode the more frequent in fewer bits and the less frequent in more bits, the total length of the encoded text will be diminished. This consideration suggests that we use Huffman or arithmetic coding, preferably of adap
输入8个字符(数目可以自己设定,需要改动程序中N的值),注意空格也算字符,然后输入权值,会显示构造的霍夫曼树及每个字符的编码-Encode:enter 8 characters,then enter 8 numbers,this program will print the huffman tree and each char s code.
compressive sensing 新版本MMA14- This is an example using the Subspace Pursuit
Algorithm of Wei Dai and Olgica Milenkovic
"Subspace Pursuit for Compressive Sensing: Closing the
Gap Between Performance and Complexity"
and the Re-weighted algorithm of Rick Chartrand and Wotao Yin
"Iteratively Reweighted Algorithms for Compressive Sensing"
In order to run this example you need to install all these m.files
in the same directory and type trialSP2 at the prompt.
Written by Igor Carron
http://nuit-blanche.blogspot.com
Creative Commons Licence with attribution