void cvPreWarpImage(int line_count, IplImage* img, uchar* dst, int* dst_nums, int* scanlines) {
    void *fptr;

    fptr = dlsym(_Chcv_handle, "cvPreWarpImage_chdl");
    if(fptr == NULL) {
        fprintf(_stderr, "Error: %s(): dlsym(): %s\n", __func__,  dlerror());
        return;
    }
    dlrunfun(fptr, NULL, cvPreWarpImage, line_count, img, dst, dst_nums, scanlines);
}
