中文说明：
利用霍夫曼编码算法对数字图像进行压缩及解压缩处理，解压出来的图像与源图像几乎完全一致，峰值信噪比为无穷大
English Description：
Huffman coding algorithm is used to compress and decompress the digital image. The decompressed image is almost the same as the source image, and the peak signal-to-noise ratio is infinite