局部Log.Euclidean协方差矩阵描述子 L2ECM SPD矩阵的空间并不是一个向量空间,而是一个黎曼流形。因此,传统 欧氏空间内的运算 例如欧氏距离、均值-Local Log-Euclidean Covariance Matrix (L2ECM) Local Log-Euclidean Covariance Matrix (L2ECM) to represent neighboring image properties by capturing cor- relation of various image