void cvNormalize(CvArr* src, CvArr* dst, double a, double b, int norm_type, CvArr* mask) {
    void *fptr;

    fptr = dlsym(_Chcv_handle, "cvNormalize_chdl");
    if(fptr == NULL) {
        fprintf(_stderr, "Error: %s(): dlsym(): %s\n", __func__,  dlerror());
        return;
    }
    dlrunfun(fptr, NULL, cvNormalize, src, dst, a, b, norm_type, mask);
}
