void cvFindCornerSubPix(CvArr* image, CvPoint2D32f* corners, int count, CvSize win, CvSize zero_zone, CvTermCriteria criteria) {
    void *fptr;

    fptr = dlsym(_Chcv_handle, "cvFindCornerSubPix_chdl");
    if(fptr == NULL) {
        fprintf(_stderr, "Error: %s(): dlsym(): %s\n", __func__,  dlerror());
        return;
    }
    dlrunfun(fptr, NULL, cvFindCornerSubPix, image, corners, count, win, zero_zone, criteria);
}
