实现基本JPEG的压缩和编码分三个步骤:

1. 首先通过DCT变换去除数据冗余；

2. 使用量化表对DCT系数进行量化；

3. 对量化后的系数进行Huffman编码。-Realize the basic JPEG compression and encoding is divided into three steps: 1. First of all, through the DCT transform to remove data redundancy　2. The use of quantization table of quantization DCT coefficients　3. Quantization coefficients after Huffman coding.