压缩包内包含两个m文件，一个是直方图均衡化，另一个是频域滤波，即对一幅图像进行低通、高通滤波，并且使用高频强调和直方图均衡相结合的方法增强图像；另外包含了四张测试用的图片。(Compressed packet contains two m files, one is histogram equalization, the other is a low pass filtering in frequency domain, i.e., images of a high pass filter, and methods of using high frequency emphasis and histogram equalization combining image enhancement; also contains four test images.)