General solutions of above inverse problem in positive definite matrix and in orthogonal matrix are given here by using factorization method of matrix.

本文用矩阵分解法给出该反问题在正定矩阵类及正交矩阵类中的通解。

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Absrtact: Non - negative matrix factorization (NMF) is a method of parts - based feature extraction, it has been already applied to face recognition successfully.

摘要：非负矩阵分解方法是基于局部特征的特征提取方法，已经成功用于人脸识别。

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