void cvAddWeighted(CvArr* src1, double alpha, CvArr* src2, double beta, double gamma, CvArr* dst) {
    void *fptr;

    fptr = dlsym(_Chcv_handle, "cvAddWeighted_chdl");
    if(fptr == NULL) {
        fprintf(_stderr, "Error: %s(): dlsym(): %s\n", __func__,  dlerror());
        return;
    }
    dlrunfun(fptr, NULL, cvAddWeighted, src1, alpha, src2, beta, gamma, dst);
}
