灰度变换是指根据某种目标条件按一定变换关系逐点改变源图像中每一个像素灰度值的方法。目的是为了改善画质，使图像的显示效果更加清晰。 图像的灰度变换处理是图像增强处理技术中的一种非常基础、直接的空间域图像处理方法，也是图像数字化软件和图像显示软件的一个重要组成部分。提取像素进行变化(Grayscale transformation is a method of changing the gray value of each pixel in a source image according to certain target conditions according to certain transformation relations. The purpose is to improve the quality of the picture and make the display effect clearer. The image processing is a very basic and direct image processing method in the image enhancement processing technology. It is also an important part of the image digital software and the image display software.)