包含图像的中值滤波、直方图均衡化、边缘检测（Sobel,Robert两种算子）、图像的Huffman编码。并计算图像熵，平均码长，编码效率及码树长度。附加可压缩与解压缩任意文件的功能和查看直方图的功能。但只能处理bmp格式的文件。-contain images of the median filtering, histogram equalization, edge detection (Sobel. Robert Two Operator), the image of Huffman coding. Image entropy calculated, the average code length, and coding efficiency code tree length. Additional crumple and decompress arbitrary document and check the function histogram function. It can only handle bmp format documents.