双边滤波模板主要有两个模板生成，第一个是高斯模板，第二个是以灰度级的差值作为函数系数生成的模板。然后这两个模板点乘就得到了最终的双边滤波模板。第一个模板是全局模板，所以只需要生成一次。第二个模板需要对每个像素都计算一次，所以需要放到循环的里面来生成。-There are two main bilateral filtering template template generation, the first one is the Gaussian template, and the second is the gray level as a function of the difference between the coefficient generation templates. Then both templates dot get the final bilateral filtering template. The first template is a global template, so only need to be generated once. The second template required for each pixel is calculated once, we need to put inside the loop to generate.