说明：  图像压缩实验，实现基本JPEG的压缩和编码的三个步骤，DCT变换去除数据冗余，DCT系数进行量化，对量化后的系数进行Huffman编码
(Image compression experiments, the three steps of the basic JPEG compression and encoding, DCT transform to remove data redundancy, and the DCT coefficient quantization, Huffman coding of the quantized coefficients)