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 methods to enhance the depth of the research, through the Matlab experiment to get the actual treatment effect.