数字图像高斯滤波C++源代码

/************************Blur(smooth) Image using gaussian 3*3 kernel ****************************************************

Function Name :  SmoothImage
Input         :  int *** , int , int , int
Output        :  int ****

*****************************************************************************************/

int*** SmoothImage(int ***XImage ,int width, int height, int channel)
{


     double sigma =  1.85; //(n/2 -1)*0.3 +0.8  { n = 9 ,no. of elements}
 double conv[3][3];
 double hg = 0;

//Convolution kernel
for(int i=0; i<3;i++)
{
for(int j=0;j<3;j++)
{

int u=i-1; //subtract from centre element index in 3*3 (1,1)
int v=j-1;

conv[i][j] =exp ( - ((u*u) + (v*v)) / (2*sigma*sigma) ); 
hg += conv[i][j];

                      
}