int cvFindChessboardCorners(void* image, CvSize pattern_size, CvPoint2D32f* corners, int* corner_count, int flags) {
    void *fptr;
    int retval;

    fptr = dlsym(_Chcv_handle, "cvFindChessboardCorners_chdl");
    if(fptr == NULL) {
        fprintf(_stderr, "Error: %s(): dlsym(): %s\n", __func__,  dlerror());
        return -1;
    }
    dlrunfun(fptr, &retval, cvFindChessboardCorners, image, pattern_size, corners, corner_count, flags);
    return retval;
}
