The two basic modes of mathematical model-behavior mode and state variable mode, along with the isomorphic and homomorphic relation between models and real system are described.
系统数学模型的基本模式：行为模式和状态变量模式以及在状态变量模式下的同构与同态系统；
Physical object of bus protection is a function with certain relation between inputs and outputs, which can be replaced by an ANN model, i. e. can be approximated by an ANN mathematical model.
母线保护的物理对象是一个输入输出关系确定的函数对象，可用一个ANN模型去替代，或用一个ANN数学模型去逼近母线保护物理对象的输入输出之间的函数关系。
On this basis, mathematical model of depth recovery according to "circle-depth relation" algorithm and projection rules was constructed.
在此基础上，构建了基于“半径—深度”算法和空间投影关系的深度恢复模型。
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