说明：  首先使用拉普拉斯变换突出图像中的小细节，然后用梯度法突出其边缘。将变换图像与原图叠加，得到混合增强后的图像；最后对图像进行灰度变换（幂次变换）
(Laplace transform to highlight the first to use images of small details, and then use the gradient method to highlight its edge. Will transform the image with the image overlay, to be mixed enhanced image finally the image grayscale transform (power conversion))