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RISS 인기검색어
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- 저자 : Jerome Charton (검색결과 2 건)
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Mesh repairing using topology graphs
Jerome Charton,Stephen Baek,Youngjun Kim 한국CDE학회 2021 Journal of computational design and engineering Vol.8 No.1
Geometrical and topological inconsistencies, such as self-intersections and non-manifold elements, are common in triangular meshes, causing various problems across all stages of geometry processing. In this paper, we propose a method to resolve these inconsistencies using a graph-based approach. We first convert geometrical inconsistencies into topological inconsistencies and construct a topology graph. We then define local pairing operations on the topology graph, which is guaranteed not to introduce new inconsistencies. The final output of our method is an oriented manifold with all geometrical and topological inconsistencies fixed. Validated against a large data set, our method overcomes chronic problems in the relevant literature. First, our method preserves the original geometry and it does not introduce a negative volume or false new data, as we do not impose any heuristic assumption (e.g. watertight mesh). Moreover, our method does not introduce new geometric inconsistencies, guaranteeing inconsistency-free outcome.
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Hannah Kim(김한나),Hyun A Kim(김현아),Tae-guen Son(손태근),Hyunchul Cho(조현철),Jerome Charton(샤통 제롬),Woo Shik Jeong(정우식),Jong Woo Choi(최종우),Youngjun Kim(김영준) 대한기계학회 2017 대한기계학회 춘추학술대회 Vol.2017 No.11
Orbital wall is the thinnest bone that surrounds eyeballs. When there is an external force to mid-upper face, it is blown out to protect the eye from the pressure. Orbital fracture is a common traumatic deformity, but it can cause not only functional problems, but also esthetical problems such as exophthalmos or enophthalmus, and diplopia. The surgeon corrects eyeball position by placing plates to the fractured sites, but limited intra-operative view and complex anatomy make it difficult. 3D surgical software systems have been used for seeming the patient safety and getting reliable outcomes. However, these are not specialized for the surgery and time-consuming manual works are needed frequently. Thus, we propose a virtual surgical planning and implant design system. We focus on increasing usability by automated functions and minimized user interaction. There are four main modules in the proposed system. First, 3D patient’s model is automatically reconstructed from CT data, and the next, the fractured region is detected and visualized by registration of both orbits. Based on the detected area, patient-specific implant is designed using template models. After the surgery, pre-and post-operative 3D models can be compared and analyzed by using synchronized dual view, measurement tools and visualization of the difference of both models. We performed visual inspection for 3D modeling and fractured detection. As a result, the orbital wall of 3D facial model is properly reconstructed without unnecessary holes and the detected regions include real fractured sites properly. The average processing time takes about 4 minutes. In comparison with conventional systems, ours covers most functions and has strengths for automated functions such as orbital wall segmentation and fracture detection. We expect that the automated and optimized functions can reduce pre-operation time and improved surgical outcomes can be derived by using patient-specific 3D printed implant.
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