def hessian_matrix_eigvals(Hxx, Hxy, Hyy):
 return _image_orthogonal_matrix22_eigvals(Hxx, Hxy, Hyy)

def hessian_matrix_eigvals ( Hxx , Hxy , Hyy ) : return _image_orthogonal_matrix22_eigvals ( Hxx , Hxy , Hyy )
compute eigenvalues of hessian matrix .