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提出一种基于差准则的二维非参数特征分析(2-dimensional nonparametric feature analysis based on differ-ence criterion,2DDNFA)的图像特征提取方法,它结合了二维线性判决分析(2-dimensional linear discriminant analysis,2DLDA)、最大散度差(maximum scatter difference,MSD)、非参数判决分析(nonparametric feature analysis,NF