Comments on "On Image Matrix Based Feature Extraction Algorithms
Quanxue Gao, Lei Zhang, David Zhang, Jian Wu Yang · IEEE Transactions on Systems Man and Cybernetics Part B (Cybernetics) · 2007
A class of image-matrix-based feature extraction algorithms has been discussed earlier. The correspondence argues that 2-D principal component analysis and Fisher linear discriminant (FLD) are equivalent to block-based PCA and FLD. In this correspondence, we point out that this statement is not rigorous.