算术编码是图像压缩的主要算法之一。　在给定符号集和符号概率的情况下，算术编码可以给出接近最优的编码结果。使用算术编码的压缩算法通常先要对输入符号的概率进行估计，然后再编码。这个估计越准，编码结果就越接近最优的结果

-Arithmetic coding is one of the main algorithm of image compression. In the case of the given sets of symbols and the symbol probability, the arithmetic coding can be given close to the optimal result of the coding. Using arithmetic coding compression algorithm usually first to estimate the probability of the input symbol, and then re-encoded. This estimate accurately coding the results closer the optimal results