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| Fältnamn | Indikatorer | Metadata |
|---|---|---|
| 000 | 04097naa a2200493 4500 | |
| 001 | oai:DiVA.org:ltu-86504 | |
| 003 | SwePub | |
| 008 | 210802s2021 | |||||||||||000 ||eng| | |
| 024 | 7 | a https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-865042 URI |
| 024 | 7 | a https://doi.org/10.3390/rs131426652 DOI |
| 040 | a (SwePub)ltu | |
| 041 | a engb eng | |
| 042 | 9 SwePub | |
| 072 | 7 | a ref2 swepub-contenttype |
| 072 | 7 | a art2 swepub-publicationtype |
| 100 | 1 | a Mirzazade, Aliu Luleå tekniska universitet,Byggkonstruktion och brand4 aut0 (Swepub:ltu)alimir |
| 245 | 1 0 | a Workflow for Off-Site Bridge Inspection Using Automatic Damage Detection-Case Study of the Pahtajokk Bridge |
| 264 | c 2021-07-07 | |
| 264 | 1 | b MDPI,c 2021 |
| 338 | a print2 rdacarrier | |
| 500 | a Validerad;2021;Nivå 2;2021-08-02 (beamah) | |
| 520 | a For the inspection of structures, particularly bridges, it is becoming common to replace humans with autonomous systems that use unmanned aerial vehicles (UAV). In this paper, a framework for autonomous bridge inspection using a UAV is proposed with a four-step workflow: (a) data acquisition with an efficient UAV flight path, (b) computer vision comprising training, testing and validation of convolutional neural networks (ConvNets), (c) point cloud generation using intelligent hierarchical dense structure from motion (DSfM), and (d) damage quantification. This workflow starts with planning the most efficient flight path that allows for capturing of the minimum number of images required to achieve the maximum accuracy for the desired defect size, then followed by bridge and damage recognition. Three types of autonomous detection are used: masking the background of the images, detecting areas of potential damage, and pixel-wise damage segmentation. Detection of bridge components by masking extraneous parts of the image, such as vegetation, sky, roads or rivers, can improve the 3D reconstruction in the feature detection and matching stages. In addition, detecting damaged areas involves the UAV capturing close-range images of these critical regions, and damage segmentation facilitates damage quantification using 2D images. By application of DSfM, a denser and more accurate point cloud can be generated for these detected areas, and aligned to the overall point cloud to create a digital model of the bridge. Then, this generated point cloud is evaluated in terms of outlier noise, and surface deviation. Finally, damage that has been detected is quantified and verified, based on the point cloud generated using the Terrestrial Laser Scanning (TLS) method. The results indicate this workflow for autonomous bridge inspection has potential. | |
| 650 | 7 | a NATURVETENSKAPx Data- och informationsvetenskapx Datorseende och robotik0 (SwePub)102072 hsv//swe |
| 650 | 7 | a NATURAL SCIENCESx Computer and Information Sciencesx Computer Vision and Robotics0 (SwePub)102072 hsv//eng |
| 653 | a Bridge 3D modeling | |
| 653 | a Bridge inspection | |
| 653 | a Computer vision | |
| 653 | a Damage assessment | |
| 653 | a Damage detection | |
| 653 | a Damage segmentation | |
| 653 | a Intelligent hierarchical DSfM | |
| 653 | a UAV | |
| 653 | a Unmanned inspections | |
| 653 | a Byggkonstruktion | |
| 653 | a Structural Engineering | |
| 700 | 1 | a Popescu, Cosmin,d 1987-u Luleå tekniska universitet,Byggkonstruktion och brand,SINTEF Narvik AS, Narvik, 8517, Norway4 aut0 (Swepub:ltu)cospop |
| 700 | 1 | a Blanksvärd, Thomas,d 1979-u Luleå tekniska universitet,Byggkonstruktion och brand4 aut0 (Swepub:ltu)thojoh |
| 700 | 1 | a Täljsten, Björn,d 1961-u Luleå tekniska universitet,Byggkonstruktion och brand4 aut0 (Swepub:ltu)bjotal |
| 710 | 2 | a Luleå tekniska universitetb Byggkonstruktion och brand4 org |
| 773 | 0 | t Remote Sensingd : MDPIg 13:14q 13:14x 2072-4292 |
| 856 | 4 | u https://doi.org/10.3390/rs13142665y Fulltext |
| 856 | 4 | u https://www.mdpi.com/2072-4292/13/14/2665/pdf |
| 856 | 4 8 | u https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-86504 |
| 856 | 4 8 | u https://doi.org/10.3390/rs13142665 |
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