Papers by Keyword: 3D Reconstruction

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Authors: Feng Gao, Gang Li, Hiroshi Okada
Abstract: Coronary artery disease is a narrowing of lumen in the coronary artery usually resulting in permanent heart muscle damage or heart attack. Intravascular stents are tubular structures placed into stenotic artery to expand the inside passage and improve blood flow. The mechanical factors affect the restenosis after stenting and image-based simulation has become a popular tool for acquiring information. The study aims to provide physicians with a feasible method for 3D entity reconstruction of coronary stented artery. The coronary artery images derived from patient before and after stenting were processed by Mimics for image segmentation and 3D reconstruction. The coronary blood and wall were constructed, as well as the stented artery model. The model can be used for hemodynamic and fluid structure interaction simulation.
504
Authors: Yan Fang, Xi Chen Yang, Jian Bo Lei
Abstract: A repair method for damaged parts based on laser robot system is proposed. First, to obtain 3D point cloud in the robot coordinate system, damaged part surfaces are scanned with binocular stereo vision system, including camera calibration and image matching. Secondly, with the point cloud data and laser processing parameters, system accomplishes path planning, generates robot programs. Experimental results show that system can effectively achieves 3D reconstruction and path planning, which further enable high precision remanufacturing.
3350
Authors: Xue Jun Qu, Yue Wen Song, Yong Wang
Abstract: To improve efficiency of industry inspection, measuring method of part shape which combines laser linear scanning and binocular vision is researched. In the system, two cameras are located at certain angle, and linear structured light is projected onto the part surface to produce distorted laser light stripe, which is used as measure feature curve. Ordinary planar plate is used as the calibration template in system calibration and images of serial parallel lines bundle are displayed on it which are acquired simultaneously by the camera to produce image series. Calibration parameters are divided into several parts, so as to calibration of them so that interference between different parts can be eliminated significantly. Based on above works, system calibration and reconstruction of 3D coordinate are implemented successfully. Experimental result shows our method’s feasibility and effectiveness, thus good prospect can be expected to it.
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Authors: D. Ruvalcaba, Dmitry G. Eskin, Laurens Katgerman
Abstract: In the present investigation, serial sectioning and 3D reconstructions are made on samples quenched at selected temperatures during unconstrained solidification in order to observe the evolution in morphology of coarse dendrites in 3D. The 3D microstructure reconstruction during the solidification of an Al−7 wt.% Cu alloy allowed the identification of a complex coarse morphology of dendrites. High-ordered branches present different morphologies at different temperatures and locations in the microstructure due to coarsening and coalescence. 3D visualization of complex dendritic structures is discussed in the present investigation.
1015
Authors: D. Ruvalcaba, Dmitry G. Eskin, Laurens Katgerman
Abstract: In the present research the possibility of studying the solidification of aluminum alloys by using the quenching technique is analyzed. Since the quenching technique does not provide reliable information (i.e. due to an overestimation of solid fraction) when measuring the solid fraction over 2D images from samples quenched at high temperature, the overestimation problem is investigated by analyzing 3D reconstructed microstructures from quenched samples. The 3D reconstructed microstructure may provide better understanding about the cause of overestimation of solid fraction when quenching at high temperatures. Consequently, the reconstruction of the microstructure that has existed before quenching may be possible after identifying and removing the solid phase that develops during quenching. In the present research, binary aluminum alloys are solidified and quenched at different temperatures, and then 3D reconstructed images are analyzed. The possibility of reconstructing the microstructure that develops during solidification before quenching is discussed.
1707
Authors: Ying Jun Sun, Xin Guo Cui, Zun Yi Xu
Abstract: A new method to realize 3D measurement and modeling based on Active Control System was put forward in the paper. The Active Control System included two parts: one was for the calibration of digital camera, and the other was for the six-freedom control of digital camera. This method enlarged the intersection angle and improves the intersection precision by multi-baseline photography; enlarges the angle of view by panning photography, and resolves the difficulty of matching for images with large intersection angle. The experiments proved that this method can acquire the high accuracy and improves the production efficiency.
2324
Authors: Marialuisa Mongelli, Gerardo de Canio, Ivan Roselli, Marialaura Malena, Andrea Nacuzi, Gianmarco de Felice
Abstract: Technological advances in the digital camera industry and computing resources make the use of photogrammetry a very fast, low-cost, contactless and non-destructive technique. It can represent a good alternative to obtain 3D information for monitoring and conservation of cultural heritage assets, especially where it is not possible to use 3D laser scanners and also in situations where areas to be inspected are not easily accessible [1]. Resolution generally depends on the number of images, their quality and the level of overlap between them, as well as hardware and software capabilities. Starting from 2D aerial or terrestrial photographic images, photogrammetry allows to reconstruct a 3D model in the form of a "point cloud" and also to derive accurate 3D measurements of large architectural elements.This paper is about stereo-photogrammetric scanning by drone performed by MENCI software s.r.l. aimed at the definition of the state of conservation of the “Bridge of the Towers” in Spoleto and its long term preservation without building scaffoldings. It was performed within the RoMA (Resilience enhancement of a Metropolitan Area) project, through an agreement between the “Italian National Agency for New Technologies, Energy and Sustainable Economic Development” (ENEA) and the “Italian Ministry of Cultural Heritage and Activities” (MIBACT).Photogrammetric scanning and FE modelling were applied within the project together with many other monitoring techniques in order to assess the bridge cracks pattern and its structural health by a multidisciplinary approach that allows their mutual validation [2].As one of the most important problems in the use of photogrammetric 3D reconstruction is the considerable demand in terms of hardware and software resources for images processing and data storage, thanks to the HPC (High Performance Computing) resources provided by the CRESCO infrastructure (Research Computational Centre on Complex Systems), it was possible to analyse and process a large amount of high-resolution photos in order to detect the crack pattern and to assess the actual damage state to be monitored over time [3].
423
Authors: Jing Wei Wang, Yan Jiang, Dong Ling Ma
Abstract: In this paper, the work of data acquisition is devided into the horizontal distance and height measurement according to the features of 3D data obtained from ancient building. The non-prism total station is used to achieve the non-damage and non-contact data acquisition from the ancient building. Moreover, the method of 3D reconstruction and digital preservation of ancient building is introduced based on 3DGIS, which has practical value based on its efficiency and reliable accuracy.
1962
Authors: Satrio Wicaksono, Peter Lukito Ferdian, Tatacipta Dirgantara, Andi Isra Mahyuddin, Sandro Mihradi, Gantini Subrata
Abstract: Stress distributions that occur in the free end second premolar tooth and its root form dental implant replacement were evaluated using finite element method. In the modelling process, 3D reconstructions were performed. Instead of doing it manually, the 3D reconstruction in this paper was done using cone beam computed tomography (CBCT) scanning process. The 3D reconstruction method used in this paper, is considerably faster than the traditional manual 3D reconstruction method. In order to mimic the actual biting force, static load of 200 N was modelled in the vertical direction parallel to the long axis of the tooth which is placed on bite contact at second premolars and dental implant crown. The stress result on root form dental implant is generally higher than the stress on the natural free end second premolar tooth. The stress concentration locations on root form dental implant were also found and will be used in the future to improve the design of root form dental implant.
445
Authors: Zhi Gang Niu, Li Jun Li, Tie Wang
Abstract: In order to meet the need of identifying obstacles and navigating for the Coal Mine Detection Robot which is used to rescue life and detect environment from coal mine disaster, binocular stereo vision is researched and 3D model of objects around the robot is reconstructed by means of two cameras of visual system built in the robot. The two cameras are calibrated and two projection matrices of them are obtained. Then, two images of the same scene are obtained by the two cameras. The matching points of two-dimensional coordinate are got through Harris corner extraction and stereo matching. According to the principle of binocular vision, equations are obtained and solved by least square method, which can calculated the discrete points of 3D coordinate.
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