像锐化的目的是加强图像中景物的边缘和轮廓。锐化的作用是要使灰度反差增强。因为边缘和轮廓都位于灰度突变的地方。所以锐化算法的实现是基于微分(差分)作用。-Like sharpening is to enhance the edges of the image and profile features. The role is to make the grayscale sharpening contrast enhancement. Because the gray edges and conto