微分法 在图象中,边缘是由灰度级和相邻域点不同的象素点构成的。因而,若想增强边缘,就应该突出相邻点间的灰度级的变化-Differentiation in the image, the edge is adjacent to the gray-scale and different domains consisting of the pixel points. Thus, if the edge enhancement, it should be highlighted between adjac