中文摘要：

针对三维模型简化中保留细节特征的要求，提出了一种基于视觉特征保持的三维几何模型简化算法。采用半边折叠操作，综合考虑了网格模型中半边的几何重要性和变化误差，并将其作为各半边的折叠代价来确定模型中边的折叠顺序，在模型简化后又利用顶点“微调”法对简化模型进行了局部视觉效果修正。实验研究结果表明：本文提出的三维几何模型简化算法能有效地保留模型的细节特征，并能显著改善模型因简化产生的形变，是一种简单、有效的模型简化算法。

英文摘要：

To satisfy the requirement of preserving details in equipment geometric model simplification, a novel 3D geometric model simplification method based on preserved vision feature was put folward. In the algorithm, a new error metric rule based on the geometric importance （including the length of the edge and the vertical curvature） and change error of a half-edge was proposed to determine the order of edge collapse in 3D geometric model simplification. And then, a vertex micro-adjusting algorithm was adopted to modify the local details of the 3D geometric model. Experimental results show that the proposed simplification method is practical and convenient, and can effectively preserve model details and obviously improve model distortion in 3D geometric model simplification.