以下是一个3*3箱式滤波器的实现代码，请填空完成。void ImgFilter_Smooth(unsigned char *img,int width,int height){int i,j,m,n;inttemp;unsigned char *img_Filter = new unsigned char[width*height];memcpy(img_Filter,img,width*height);for(i = 1;i<_____________ ;i++)for(j = 1;j<________________;j++){temp = 0;for(m=-1;m<=1;m++)for(n=-1;n<=1;n++){temp +=*(img+(i+m)*width+(j+n));}*(img_Filter+____________) =temp/ 9;}memcpy(img,img_Filter,width*height);delete img_Filter;}