中文摘要：

提出了基于真三维TIN的数据压缩思路，根据最大夹角与阈值之间的关系决定点的取舍，给出了相应的压缩算法，对于变化平缓的表面有很好的压缩效果。并以同济大学的孔子头像为例，给出了具体的实现方法，同时对数据压缩结果的质量采用多种方法进行了评价，以验证方法的可行性。

英文摘要：

A data compress idea is put forward by considering the judge accordance of the angle between two normal lines of the triangular plane face. So that the corresponding algorithm of the data compress is given by calculating the angle between two normal lines. The acceptance or rejection of a point is determined according to the comparison between the biggest angle with the defined threshold. As a case study, the Kongzi portrait in Tongji University is scanned and the real three dimensional model is established. The data compression aim to the Kongzi portrait is conducted to achieve the realization of the given method. In order to prove the feasibility of the method and the quality of the compression, several evaluation resuits are then analyzed same with the case data.