Rotational Invariant Discriminant Subspace Learning For Image Classification

A novel discriminant analysis technique for feature extraction, referred to as Robust Discriminant Subspace (RDS) with L2,p+s-Norm Distance Maximization-Minimization (maxmin) is posed. In its objective, the within-class and between-class distances are measured by L2,p-norm and L2,s-norm, respectively, such that it is robust and rotational invariant. An efficient iterative algorithm is designed to solve the resulted objective, which is non-greedy. We also conduct some insightful analysis on the convergence of the proposed algorithm. Theoretical insights and effectiveness of our RDS are further supported by promising experimental results on several images databases.