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RISS 인기검색어
- 검색키워드
- 저자 : Alessandro Moro (검색결과 2 건)
- 무료
- 기관 내 무료
- 유료
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3D Reconstruction of Structures using Spherical Cameras with Small Motion
Sarthak Pathak,Alessandro Moro,Hiromitsu Fujii,Atsushi Yamashita,Hajime Asama 제어로봇시스템학회 2016 제어로봇시스템학회 국제학술대회 논문집 Vol.2016 No.10
In this research, a method for dense 3D reconstruction of structures from small motion of a spherical camera is proposed. Spherical cameras can capture information from all directions enabling measurement of the entire surrounding structure at once. The proposed technique uses two spherical images clicked at slightly displaced positions near the structure, followed by a combination of feature-point matching and dense optical flow. Feature-point matching between two images alone is usually not accurate to give a dense point cloud because of outliers. Moreover, calculation of the epipolar direction with feature point matching is susceptible to noise with small displacements. However, spherical cameras have unique parallax properties allowing use of dense, global information. Taking advantage of this, the global, dense optical flow field is used. The epipolar geometry is densely optimized based on the optical flow field for an accurate 3D reconstruction. A possible use of this research could be to measure large infrastructures (bridges, tunnels, etc.) with minimal robot motion.
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Our problems and observations in 3D facial implant planning
Gianmarco Saponaro,Chiara Paolantonio,Giorgio Barbera,Enrico Foresta,Giulio Gasparini,Alessandro Moro 대한악안면성형재건외과학회 2022 Maxillofacial Plastic Reconstructive Surgery Vol.44 No.-
Background: Three-dimensional renderings of two-dimensional computed tomography data have allowed for more precise analysis in the craniofacial field. Design, engineering, architecture, and other industries have paved the way for the manipulation and printing of three-dimensional objects. The usual planning is only carried out based on the bony structures, often without taking into consideration the presence of soft tissues and soft structures. During our practice, we have found ourselves facing the challenge posed by these structures; the aim of this article is to discuss our experience in designing implants presenting our tips and tricks for a better planning leading to an easy and reliable positioning. Case presentation: We have retrieved all patients in 5 years among those who underwent computer-aided design/ computer-aided manufacturing implant placement in the last 5 years in order to review the eventual problems and the solutions found. A total number of 25 patients were retrieved and, among them, 10 patients were selected, in which planning inaccuracy caused difficulties during implant placement and which then led to induced changes during the planning of similar cases or in which the problems were noted before or during the planning which led to changes in the plan to address those problems. Six of the selected cases were polyetheretherketone facial implants for the correction of residual deformities in malformed or deformed patients. One case was a delayed orbital reconstruction with a titanium implant. Two cases were titanium functional and anatomical reconstruction of the mandible in patients with failed post-oncological reconstructions. There was 1 case with a mandibular ramus complex and hard-to-treat fracture. Conclusions: The planning of the implant mostly relies on hard tissue three-dimensional reconstruction, but it should not be limited at what is immediately evident. A surgeon’s clinical experience should always guide the process, with knowledge of the patient’s anatomy and evaluation of the quality and of the soft tissue response being taken into consideration. The implant should always be tailored not only based on the bone defect and evaluations but also using the patient’s previewed and actual anatomy, evaluating eventual interferences and pitfalls.
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