基于三维模型的考古线图提取方法

考古线图可直观展现文物外形特征，是文物必不可少的存档资料，传统方法由人工测绘得到，耗时长、精度差，且易对文物造成二次伤害.本文提出一种基于文物三维模型自动化生成其考古线图的方法，并将其运用于兵马俑碎片的线图生成工作.扫描得到兵马俑碎片模型并对其进行去噪、补洞、简化等预处理，根据法向离散度信息判定模型的特征点，再检测模型的轮廓线与特征线，以此完成文物线图的绘制.该方法对原始模型要求较低，且视角灵活、可用性强，大幅缩减了考古绘图时间. 

Extraction Method of Archaeological Line Graph Based on 3D Model

Archaeological line graph can not only show the shape characteristics of cultural relics, but also serve as their essential archives.It is obtained by manual work traditionally with high time-consuming and low accuracy as well as may cause new damage to cultural relics.In this paper,a new method was proposed based on a 3D model of cultural relics to generate archaeological line graph automatically,and was applied to debris models of Terracotta Warriors. First of all,the debris models were obtained by laser scanning and were pre-treated such as denoising,hole filling and simplification.Then,the feature points were extracted from the model according to the normal dispersion of vertex.At last,the contour was detected and the features line was drawn to complete line graph of the cultural relics.This method not only has low requirements for the primitive model but also own flexible perspectives and a high usability,it can significantly improve the efficiency of archaeological drawing.