把图像分成8x8的图像块进行DCT变换压缩，再用霍夫曼编码，其中DCT变换未调用matlab 的函数，可以满足一些作业的要求-The image is divided into 8x8 image blocks of compressed DCT transform, then Huffman coding, which is not the DCT matlab function calls, meet some of the requirements of the job