gauss_newton      505 modules/calib3d/src/epnp.cpp void epnp::gauss_newton(const CvMat * L_6x10, const CvMat * Rho, double betas[4])
gauss_newton      573 modules/calib3d/src/upnp.cpp void upnp::gauss_newton(const Mat * L_6x12, const Mat * Rho, double betas[4], double * f)