void cvSmooth(CvArr* src, CvArr* dst, int smoothtype, int size1, int size2, double sigma1, double sigma2) {
    void *fptr;

    fptr = dlsym(_Chcv_handle, "cvSmooth_chdl");
    if(fptr == NULL) {
        fprintf(_stderr, "Error: %s(): dlsym(): %s\n", __func__,  dlerror());
        return;
    }
    dlrunfun(fptr, NULL, cvSmooth, src, dst, smoothtype, size1, size2, sigma1, sigma2);
}
