Whitens the data (row vectors) and reduces dimension. Returns the whitened vectors (row vectors), whitening and dewhitening matrices.-matlab code

白噪化处理，这是高光谱图像数据降维的前预处理，也称为球化，在数据降维中必须用到-White noise process, which is pretreatment hyperspectral image data dimensionality reduction, also called the ball in the data dimensionality reduction must be used