2DPCA,即二维主成分分析，相对于传统的PCA（主成分分析），2DPCA在对二维图像进行降维时不需要转成一维（向量）-2DPCA, ie two-dimensional principal component analysis, as opposed to the traditional PCA (Principal Component Analysis), 2DPCA in dimensionality reduction of two-dimensional images into one

主成分分析 （ Principal Component Analysis ， PCA ）；特征脸；opencv-Principal component analysis (Principal Component Analysis, PCA) characteristic face opencv

主成分分析：实现对对维数较大的矩阵进行降维处理- principal component analysis