图像的几何变换包括平移，装换，转置，缩放。旋转等-Image geometric transformation, including translation, equipment exchange, transposition, scale. Rotation

Hu矩具有旋转、平移、尺度等特性的不变特征，实验采用这个方法提取图像的7个不变矩特征(Hu moment has the invariant characteristics of rotation, translation, scale and other characteristics, the experiment uses this method to extract the image of the seven invariant moments)