关键词: 三维薄壁文物模型, 主次轮廓线, 曲面分割, 断裂面二级邻接生长, 特征轮廓线

Abstract: Aiming at the problem of incomplete feature contour extraction for 3D mesh model by using
General method of detecting the edge, a new integrated algorithm of extracting feature contour from
thin-walled cultural relic fragments is proposed. This paper distinguished the concept of feature contour
from contour. Then it introduced the main contours and secondary contours, and proposed the concept
of twice adjacent growth of surfaces. The algorithm used the improved method based on edge weight
number judgment to extract the main contours; a new method of extracting the secondary contours is
proposed. Firstly, the surface of 3D mesh is segmented and the fracture surface is recognized. Then the
algorithm scans the two adjacent surfaces of growth of fracture surface with surface to extract the
secondary contours. Finally, it could get the feature contour of 3D mesh model from the main contours
and secondary contours. It extracted the feature contour of cultural relic fragments accurately with this
algorithm. The experimental results show that this method is efficient and accurate.

Key words: 3D thin-walled cultural relic fragments, main and secondary contours, surface segmentation, twice adjacent growth of fracture surface, feature contour