中文说明：该代码为利用几何不变矩提取图像几何特征的代码，用matlab编写，提取7个Hu矩为特征向量。可以用于基于内容的图像检索
English Description：
The code is used to extract the geometric features of the image using geometric moment invariants. It is written in MATLAB, and seven Hu moments are extracted as feature vectors. It can be used for content-based image retrieval