The discussion shows that with the step filter.The boundary enhancement in the region will appear when the noncontinuous gray grade (a hard boundary) and the epoch emerge in the multi-gray picture .

• 当多灰度级图像存在灰度不连续变化(硬边界)和有转折变化(尖点)时，使用阶跃滤波器都会在这样的区域内呈现边界增强。