Automatic crack detection and structural inspection of cultural heritage buildings using UAV photogrammetry and digital twin technology

Journal of Building Engineering, Journal Year: 2024, Volume and Issue: 94, P. 109952 - 109952

Published: June 17, 2024

Language: Английский

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Infrared Camera Geometric Calibration: A Review and a Precise Thermal Radiation Checkerboard Target

Sensors, Journal Year: 2023, Volume and Issue: 23(7), P. 3479 - 3479

Published: March 26, 2023

Different infrared (IR) planar geometric calibration targets have been developed over the years that exploit a well-established and flexible optical camera procedure following pinhole approximation. This is typically neglected in IR cameras, due to relatively low resolution of thermal images complex needed for comparison targets. In this study, thorough literature review numerous targets, along with their respective outcomes, were summarized leveraged deliver practical checkerboard target less experienced end users, while offering lowest reprojection errors. It was concluded fabrication high emissivity contrast precise square points intersection within pattern extends accuracy capturing these control image an optimized calibration. Accordingly, two simple fabricated using laser engraving ultraviolet (UV) printing technologies on polished stainless steel (SS304) plate. The UV-printed metallic alloy delivered mean error (MRE) 0.057 pixels root (RMSE) 0.063 pixels, standard deviation lower than 0.003 pixels. design offers better any other target, comparable results best prominent circular reported literature.

Language: Английский

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Thermal-textured BIM generation for building energy audit with UAV image fusion and histogram-based enhancement

Energy and Buildings, Journal Year: 2023, Volume and Issue: 301, P. 113710 - 113710

Published: Nov. 4, 2023

Mapping Unmanned Aerial Vehicle (UAV)-based thermal images of building façades onto a Building Information Model (BIM) can greatly support energy audit. However, accurately registering these into BIM is challenging due to image's unique characteristics low texture and high distortion. To address issues, this paper proposes new multi-source image fusion framework for UAV BIM. First, low-cost target designed produced using 3D printing calibrating camera. The rectified are then fused with RGB through Homography transformation, enabling be registered Additionally, histogram-based approach proposed correct the thermally inconsistent phenomenon enhance contrast produce high-contrast thermal-textured Field tests confirmed mean error around 5.713 pixels. A case study on masonry demonstrated feasibility effectiveness framework.

Language: Английский

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Thermal Water Prospection with UAV, Low-Cost Sensors and GIS. Application to the Case of La Hermida

Sensors, Journal Year: 2022, Volume and Issue: 22(18), P. 6756 - 6756

Published: Sept. 7, 2022

The geothermal resource is one of the great sources energy on planet. conventional prospecting this type a slow process that requires amount time and significant investments. Nowadays, geophysical techniques have experienced an important evolution due to irruption UAVs, which combined with infrared sensors can provide contributions in field. novelty technology involves lack tested methodologies for their implementation activities. research developed focused proposal methodology exploration hydrothermal resources easy, economic, rapid way. combination photogrammetry visual thermal images taken UAVs allows generation temperature maps or orthomosaics, analyzed GIS tools permit quasi-automatic identification zones potential interest along rivers lakes. proposed has been applied case study La Hermida (Cantabria, Spain), where it allowed effluent temperatures close 40 °C, according verification measurements performed area. These results allow validation method, strongly influenced by particular characteristics

Language: Английский

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Generation of Thermal Point Clouds From Uncalibrated Thermal Infrared Image Sequences and Mobile Laser Scans

IEEE Transactions on Instrumentation and Measurement, Journal Year: 2023, Volume and Issue: 72, P. 1 - 16

Published: Jan. 1, 2023

Monitoring building efficiency is a hot topic for engineers and researchers. TIR (Thermal Infrared) images describe thermal attributes but require professional knowledge analysis. Moreover, can hardly the of buildings in all aspects. Therefore, as-built point clouds become solution. In this case, geometric distortions not be neglected. To generate with image sequences, we propose to use MLS (Mobile Laser Scanning) as control sets calibration workflow cloud generation. begin with, intensity are generated from clouds, corresponding points detected frame. intrinsic parameters estimated points. Finally, calibrated clouds. The result demonstrates that automatic method achieve comparable or even better results than manual method.

Language: Английский

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Methods to mitigate the impact of work environment on the measurement of building surface temperature by unmanned aerial vehicle onboard thermal imaging system

Energy and Buildings, Journal Year: 2024, Volume and Issue: unknown, P. 114872 - 114872

Published: Oct. 1, 2024

Language: Английский

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