青铜器是我国的文化瑰宝，然而出土青铜器大多破损、变形，很多存在缺失碎块现象，包括片状缺块、跨区域缺块和结构性缺块。随着三维激光扫描和三维重建技术的发展，以高精度三维数字化文物模型为基础的文物修复技术得到了非常广泛的重视。本项目针对青铜器缺块的多样性、复杂性，拟从青铜器自身具有的形态特征出发，开展青铜器缺块数字化补配的关键技术研究，内容包括：1）研究基于轮廓线约束的保纹饰特征网格编辑方法，消除青铜器变形对后续处理的影响；2）研究具有缺失数据的模型对称性分析方法，根据模型对称变换建立覆盖缺块的初步模型；3）由于青铜器是近似对称的,缺块初步模型与周围模型一般不连续，本项目将研究其表面纹饰提取及拼接方法，局部精细调整缺块初步模型，使缺块模型上的纹饰与周围模型的纹饰美观连接。这样便可利用缺块边缘裁剪调整后的缺块初步模型，得到最终的补配结果。本项目的研究将为实现青铜器数字化修复提供技术支撑。

Bronzes are one of the Chinese cultural treasures, most unearthed bronzes inevitably miss some pieces with types of patch-like, cross-patch-like and structural ones, and are distorted to a certain extent, however. Recently, with the great improvements of the 3D laser scanning and 3D reconstruction techniques, the usage of the 3D cultural relic models with high fidelity for the cultural relic restoration has been received a widely attention. The missing pieces on bronzes are usually with different types and with complicated geometries. Therefore, this proposal aims to complete the bronze surfaces based on their morphological characteristics. Key technologies will be studied, including the following items. First, we edit the bronze surfaces with morphologies of their reliefs preserved based on contour constraints. Then, we detect the symmetry of models in the presence of the missing pieces, and make up the missing pieces using the global symmetric transformation. Due to the approximate symmetries of the bronze surfaces, the initial making-up pieces are often incoherent with its surrounding surface. Therefore, we finally extract reliefs and naturally make relief fragments on the initial pieces coordinated with the ones on the remained surface using curve matching techniques, yielding the refined making-up pieces. Our research can provide technical support on the digital restoration of bronzes.