The difficulty of integration of CAD/CAPP and the disadvantage of several feature modeling were analyzed, and levels of feature model were brought forward based on the thinking of feature conversion.

分析了CAD/CAPP集成技术的难点和当前特征建模的不足，基于特征转换思想提出了分层次建立特征模型的方法。

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System mainly divided into three modules:AAM facial feature points positioning module, FAP conversion module, and MPEG-4 model animation module.

系统主要可分为三大模块：AAM人脸特征点定位模块、FAP转换模块、MPEG-4模型动画实现模块。

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Representation of conversion knowledge is studied and conversion rules are constructed, which implement the conversion process from design feature model to machining feature model.

对由设计域到加工域的转换知识的表示和建立进行研究。实现设计特征模型到加工特征模型的转换。

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