Research On Reassembly Of Cultural Fragments Based On Multi-Feature Fusion

The virtual cultural relic restoration technology of computer-assisted is mainly applied to the reassembly of damaged cultural relics.It not only shortens the restoration period of cultural relics but also avoids the artificial destruction of the relics.Therefore,related research has become a hotspot in the field of computer graphics.The reassembly of fractured fragments based on the traditional geometry-driven depends highly on the integrity and accuracy of the geometric information on the fracture site of the fragments,so it prone to failure on the fragments with defects at the fracture site.In order to address this problem,this paper applies topological features and multi-features fusion to the reassembly of cultural relic,and focuses on the fragmentation of different damaged fragments.The main research works of this paper are included as follows:(1)Aiming at the problem that the contour curve caused by the damaged of the edge of the fracture site cannot fully represent the geometry features of the fracture surface,an automatic reassembly method based on the Morse-Smale topology feature is proposed.Firstly,according to the Morse-Smale complex theory,the topological map of the fragment fractured surface is extracted and simplified;then the reference point and the zero-value plane are defined,using the corresponding height difference between the target points,the quadrilateral surface in the topology map is constructed to be a feature descriptor to effectively represent the fracture;finally,based on the convexity complementarity,the error of the initial feature quadrilateral matching set is calculated to filter the optimal matching set,and the adjacent fragmentation relationship is determined.Experimental results show that the proposed method can obtain satisfactory reassembly results for the broken cultural artifact model with complete fractured surface structure information.(2)In order to effectively solve the problem of the lack of geometric features due to damage of fragment fractures,the traditional reassembly method driving by single geometric feature is difficult to be pieced,an automatic reassembly method based on bidirectional distance field of the fracture site contour line is proposed.The method fuses the surface decoration information with multi-feature of the fracture site,and introduces the multi-layer constraint condition of Euclidean distance consistency and convexity complementarity to construct a feature descriptor that can effectively judge the adjacency relationship between fragments.In addition,non-uniform sampling is used in the feature extraction process to reduce the redundant points in the uniform sampling process improving the efficiency of fragmentation.Experimental results show that this method not only avoids the high time cost caused by the large amount of data of traditional reassembly methods,but also has great advantages in the reassembly of fractured fragments which have different degrees of defects but the surface decoration structure is clear.