基于空域的图像增强方法，着重对灰度变换、直方图均衡化、平滑和锐化等几种常用的增强方法进行了深入的研究，通过Matlab实验得出的实际处理效果.-Based on the spatial image enhancement method, the paper focuses on the gray level transformation, histogram equalization, smoothing and sharpening, and other commonly used metho