1是对图像进行直方图均匀化，2，3分别是用Laplacian 锐化算子（分α = 1和α = 2两种情况）对256×256 大小、256级灰度 的数字图像lena.img 进行锐化处理，显示处理前、后图像。 -1 is the histogram of image uniformity, 2,3 are the Laplacian sharpening operator with a (sub α = 1 and α = 2 both cases) on the 256 × 256 si