The vertices of geometric model on the surface of object was chosen according to the curvatures which was computed directly from partial derivation of volume image.
该方法直接利用三维图像偏微分计算边缘的曲率，并根据曲率的特性，选取表面的顶点。
By theoretical derivation, the partial derivatives of the deviation between the humidity sensing characteristic curve and the fitting line to the self-resistance are obtained.
通过理论推导，获知了湿敏电阻器的感湿特性曲线与拟合直线之间的偏差随其本体电阻的变化关系。
With the terminal value of the partial derivative for boundary variates and their differetial equation, the variates can be solved by backward derivation of the differetial equation.
有了边界变量偏导数的终端值以及它们适合的微分方程，就可以由终端反向积分这些微分方程求解出这些变量来。
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