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Reassembly of broken objects using surface signatures : 표면특성을 이용한 부러진 물체의 재조립 알고리즘
DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | 이건우 | - |
dc.contributor.author | 손태근 | - |
dc.date.accessioned | 2017-07-13T06:30:27Z | - |
dc.date.available | 2017-07-13T06:30:27Z | - |
dc.date.issued | 2017-02 | - |
dc.identifier.other | 000000142391 | - |
dc.identifier.uri | https://hdl.handle.net/10371/118608 | - |
dc.description | 학위논문 (박사)-- 서울대학교 대학원 : 기계항공공학부, 2017. 2. 이건우. | - |
dc.description.abstract | As 3D object acquisition techniques and computational powers have been improved, research into the virtual reassembly of broken 3D objects has been actively conducted and techniques have been applied to various fields. However, the complicated and uneven shape of the fractured surfaces of broken objects makes it difficult to extract features for reassembling the object and forces us to use high-dimensional complex shape information. In addition, deformation of the fractured surface due to the small debris particles generated when the object is broken is one of the difficulties in this field.
In this paper, we propose a surface signature descriptor that can easily and effectively represent the complicated fracture surface of a broken object. This descriptor is inspired by the human reassembly mechanism, which matches a convex region of a fractured surface to a concave region with a similar shape of another fractured surface. This descriptor is not dependent on the local geometry of fractured surfaces, so it has the advantage of being insensitive to the small noise that may exist in the fractured surface. In addition, it is simple and easy to calculate compared with the existing high-dimensional shape information. In the process of reassembling the actual broken object using the proposed surface signature descriptor, we propose and improve the segmentation, calculation of surface roughness and similarity measures, definition of the surface roughness, and similarity measurement technique between the fractured surfaces so that the complex fractured surface can be processed. The effectiveness of the proposed method is demonstrated through the realization of reassembly using actual broken objects. In addition, we propose a verification method through the creation of hypothetical fractured surfaces as a solution to the problem of the difficulty of the quantitative evaluation of reassembly technology due to the absence of verification data before a break. The virtual fractured surface is arbitrarily generated by several factors, and it can be evaluated in various aspects, such as accuracy, efficiency, and robustness against noise of the reassembly algorithm. The reassembly method proposed in this study is also evaluated. This study is meaningful, in that it developed and improved the techniques suitable for reassembly from the beginning of the reassembly, by defining a descriptor of the 3D fractured surface, to the qualitative evaluation of the methods. It could also be expanded to other research fields related with reassembly. | - |
dc.description.tableofcontents | CHAPTER 1. INTRODUCTION 1
1.1 Background 1 1.2 Research objectives 2 CHAPTER 2. RELATED WORKS 3 2.1 2D reassembly 3 2.2 3D reassembly 4 2.3 Assessment 6 CHAPTER 3. SURFACE SIGNATURES 8 3.1 Concepts 8 3.2 Surface signature descriptor 10 3.2.1 Convex/concave analysis 10 3.2.2 Convex/concave analysis of fractured surface 15 3.3 Results and discussion 20 CHAPTER 4. REASSEMBLING 25 4.1 Overview 25 4.2 Fractured surface extraction 27 4.2.1 Smoothing 27 4.2.2 Roughness 31 4.2.3 Segmentation 36 4.2.4 Fractured surface clustering 38 4.3 Fractured surface matching 40 4.3.1 Feature curve 40 4.3.2 Matching 43 CHAPTER 5. EXPERIMENTS 50 CHAPTER 6. ASSESSMENT 60 6.1 Assessment with virtual fractured surfaces 60 6.1.1 Randomly fractured surfaces 60 6.1.2 Reassembly with randomly fractured surfaces 63 6.1.3 Assessment of reassembly 64 6.2 Assessment with real broken objects 73 6.3 Discussion 75 CHAPTER 7. CONCLUSION 76 REFERENCES 78 ABSTRACT (Korean) 88 | - |
dc.format | application/pdf | - |
dc.format.extent | 4340779 bytes | - |
dc.format.medium | application/pdf | - |
dc.language.iso | en | - |
dc.publisher | 서울대학교 대학원 | - |
dc.subject | broken object reassembly | - |
dc.subject | fractured surface | - |
dc.subject | surface signature | - |
dc.subject | virtual fractured surface | - |
dc.subject | reassembly assessment | - |
dc.subject.ddc | 621 | - |
dc.title | Reassembly of broken objects using surface signatures | - |
dc.title.alternative | 표면특성을 이용한 부러진 물체의 재조립 알고리즘 | - |
dc.type | Thesis | - |
dc.description.degree | Doctor | - |
dc.citation.pages | ix, 89 | - |
dc.contributor.affiliation | 공과대학 기계항공공학부 | - |
dc.date.awarded | 2017-02 | - |
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