In this paper, a new feature extraction method for face recognition named as kernel orthogonal isometric projection (KOIsoP) is proposed.First,the face images are mapped into a high-dimensional nonlinear space by the kernel method to obtain the nonlinear information,which helps to extract the nonlinear manifold structure information,and then a linear transformation is performed by the isoprojection to get the basis vectors.Finally the basis vectors are orthogonalized,which can preserve the nonlinear manifol...