Fragments Splicing Method for Terra-cotta Figures of Qin Dynasty Based on Contours and Fracture Surfaces Matching
Ju Liu · Jisuanji gongcheng · 2014
To meet the virtual restoration requirement of large amounts of fragments in the third excavation of Terra-cotta Warriors and Horses, properties of the fragments are analyzed, and the classification principles of earthen tub fragments are induced. In view of the fragment classification and different thicknesses of the fracture surfaces, a fragments splicing method is proposed, which combines the spatial contour curves matching and the spatial fracture surfaces matching. All of the fragments are classified according to the thickness of sections, and different matching methods are employed to adapt to different types of fragments. The multi-scale integral invariants are used as the feature representation methods for the contour curves and fracture surfaces, and the initial matching point pairs are obtained by the consistency constraint method. The filtering algorithm is used to remove the pseudo matching points, and the geometric hashing algorithm is used to find the optimal matching to get the local and global matching. This method is applied to the restoration of Terra-cotta Warriors and Horses, and the results show that it can get correct matching relationship between fragments and has good robustness.