中文说明： 在编码过程中，首先将输入图像分解为8*8大小的数据块，然后用正向二维DCT, 把每个块转变成64个DCT系数值，其中1个数值是直流（DC）系数，即8*8空域图像子块的平均值，其余的63个是交流（AC）系数，接下来对DCT系数进行量化，最后将变换得到的量化的DCT系数进行编码和传送，形成压缩后的图像格式，在解码过程中，先对已编码的量子化的DCT系数进行解码，然后求逆量化并把DCT系数转化为8*8样本像块（使用二维DCT, 反变换），最后将操作完成后的块组合成一个单一的图像，这样就完成了图像的压缩和解压过程。
English Description：
In coding process in the, first will entered image decomposition for 8*8 size of data block, then with are to II dimension DCT, put each block change into 64 a DCT coefficient value, which 1 a numerical is DC (DC) coefficient, that 8*8 airspace image child block of average, remaining of 63 a is Exchange (AC) coefficient, next on DCT coefficient for quantitative, last will transform get of quantitative of DCT coefficient for coding and transfer, Forming a compressed image format and decoding process, the coding of quantized DCT coefficients are decoded, then inverse quantization and 8*8 samples as DCT coefficients into a block (using a two-dimensional DCT and inverse transform), and finally the operation after the completion of the block are combined into a single image, this completes the process of image compression and decompression.