CvSURFParams cvSURFParams(double hessianThreshold, int extended) {
    void *fptr;
    CvSURFParams retval;

    fptr = dlsym(_Chcv_handle, "cvSURFParams_chdl");
    if(fptr == NULL) {
        fprintf(_stderr, "Error: %s(): dlsym(): %s\n", __func__,  dlerror());
        return -1;
    }
    dlrunfun(fptr, &retval, cvSURFParams, hessianThreshold, extended);
    return retval;
}
