霍夫曼编码的基本方法是先对图像数据扫描一遍，计算出各种像素出现的概率，按概率的大小指定不同长度的唯一码字，由此得到一张该图像的霍夫曼码表。编码后的图像数据记录的是每个像素的码字，而码字与实际像素值的对应关系记录在码表中。-Huffman coding method is first scanned image data again, to calculate the probability of a variety of pixel specify a different length unique code word according to the size of the probability, which a the image of the Huffman table . Encoded image data recorded in the codeword for each pixel, the corresponding relationship between the code word and the actual pixel values ​ ​ recorded in the code table.