//高斯滤波
int g_nGaussianBlurValue;
void on_ChangeGaussianBlurValue(int,void*)
{
if(g_nGaussianBlurValue>0 && g_nGaussianBlurValue%2==1)
{
GaussianBlur(g_srcImage_Contrast,g_dstImage_Contrast,Size(g_nGaussianBlurValue,g_nGaussianBlurValue),0,0);
imshow("高斯滤波",g_dstImage_Contrast);
}
}
void Test_GaussianBlur()
{
namedWindow("高斯滤波");
namedWindow("原图");
g_srcImage_Contrast=imread("D:\\OpenCV Projects\\OpenCV_Test_Image\\16.jpg");
g_nGaussianBlurValue=3;
createTrackbar("trackbar","高斯滤波",&g_nGaussianBlurValue,15,on_ChangeGaussianBlurValue);
on_ChangeGaussianBlurValue(g_nGaussianBlurValue,0);
imshow("原图",g_srcImage_Contrast);
}

原文:http://www.cnblogs.com/foggia2004/p/6596788.html