Huffman于1952年提出一种编码方法，该方法完全依据字符出现概率来构造异字头的平均长 度最短的码字，有时称之为最佳编码，一般就叫作Huffman编码。-Huffman coding in 1952 proposed a method based on characters appear completely different prefix probability to construct the average length of the shortest code word, sometimes referred to as the best coding, are generally known as Huffman coding.