中文说明：图像双边滤波的实现，既可以对灰度图像滤波，又可以对彩色图像滤波。经滤波后图像同质区域被平滑，而边缘得到了保留。
English Description：
The realization of image bilateral filtering can filter both gray image and color image. After filtering, the homogeneous region of the image is smoothed and the edge is preserved.