A strictly positive invariantregion was found for this model and some properties of its linearization in this region were presented.
证明了这个模型存在一个严格的正的不变区域，给出该模型的线性化在不变区域内的一些性质。
2
The former first eliminate the shadow of moving objects, and then extract shape invariant moment characteristics of object's whole region and identify them by a BP neural network.
The geometrical invariant space is constructed by using image normalization. A significant region is obtained from the normalized image by utilizing the invariant centroid theory.