中文说明：通过马氏距离实现影像分类，样本是envi输出的txt样本，计算混淆矩阵，检验样本是由envi输出的另一组。针对TM影像，输入6个波段，更改路径即可。
English Description：
Image classification is realized by Mahalanobis distance. The sample is the txt sample output by envi, and the confusion matrix is calculated. The test sample is another group output by envi. For TM image, input 6 bands and change the path.