添加符号用霍夫曼编码，幅度值用修改的二进制正常编码。此Jpeg是在编码前，将整个数据减去128，这样可能可以提高性能。-Add symbol Huffman coding, binary amplitude values ​ ​ with the modified normal coding. This Jpeg is prior to encoding the entire data minus 128, which may be able to improve perfo