void cvCalibrationMatrixValues(CvMat *camera_matrix, CvSize image_size, double aperture_width, double aperture_height, double *fovx, double *fovy, double *focal_length, CvPoint2D64f *principal_point, double *pixel_aspect_ratio) {
    void *fptr;

    fptr = dlsym(_Chcv_handle, "cvCalibrationMatrixValues_chdl");
    if(fptr == NULL) {
        fprintf(_stderr, "Error: %s(): dlsym(): %s\n", __func__,  dlerror());
        return;
    }
    dlrunfun(fptr, NULL, cvCalibrationMatrixValues, camera_matrix, image_size, aperture_width, aperture_height, fovx, fovy, focal_length, principal_point, pixel_aspect_ratio);
}
