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virtual void cv::xphoto::GrayworldWB::setSaturationThreshold ( float val ) ;

without this function, the below code is having no issues, but when i am trying to get or set the saturation level it is giving the error:cannot call member function ‘virtual void cv::xphoto::GrayworldWB::setSaturationThreshold(float)’ without object, what is the correct way to call the function??

int main(int argc, const char **argv)

{

Mat src,resized,res;

src = imread("/home/u-16i/Pictures/wp/beach_flowers-wallpaper-1440x900.jpg");
if (src.empty())
{
    printf("Cannot read image file");
    return -1;
}
resize(src, resized, Size(), .49, 0.49, CV_INTER_AREA);
imshow("b4 white balance", resized);

Ptr<xphoto::GrayworldWB> wb =xphoto::createGrayworldWB();
xphoto::GrayworldWB::setSaturationThreshold(0.5);//error: cannot call member function ‘virtual void cv::xphoto::GrayworldWB::setSaturationThreshold(float)’ without object
wb->balanceWhite(resized, res);

    imshow("after white balance", res);

waitKey(0);
return 0;

}