help Diagonal PCA

[Xue]

Did any one read this paper "Diagonal principal component analysis for face recognition" http://cs.nju.edu.cn/zhouzh/zhouzh.files/publication/pr06a.pdf   I do understand the paragraph between Eq.1 and Eq.2   the size of G should be (mn X mn) or (M X M) not n X n because we have M training images each one is of size (m X n) and m>n   is this correct? your help is so appreciated

[Zou Wilman]

check the published version from sciencedirect?

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W.W. ZOU
HKBU, Ph.D Candidate