ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., II-5, 57-63, 2014
https://doi.org/10.5194/isprsannals-II-5-57-2014
© Author(s) 2014. This work is distributed under
the Creative Commons Attribution 3.0 License.
 
28 May 2014
True-orthophoto generation from UAV images: Implementation of a combined photogrammetric and computer vision approach
L. Barazzetti1, R. Brumana1, D. Oreni1, M. Previtali1, and F. Roncoroni2 1Politecnico di Milano, Department of Architecture, Built Environment and Construction Engineering (ABC) Via Ponzio 31, 20133 Milano, Italy
2Politecnico di Milano, Polo Territoriale di Lecco, Via Previati 1/c, 23900 Lecco, Italy
Keywords: Automation, Matching, True-Orthophoto, UAV Abstract. This paper presents a photogrammetric methodology for true-orthophoto generation with images acquired from UAV platforms. The method is an automated multistep workflow made up of three main parts: (i) image orientation through feature-based matching and collinearity equations / bundle block adjustment, (ii) dense matching with correlation techniques able to manage multiple images, and true-orthophoto mapping for 3D model texturing. It allows automated data processing of sparse blocks of convergent images in order to obtain a final true-orthophoto where problems such as self-occlusions, ghost effects, and multiple texture assignments are taken into consideration.

The different algorithms are illustrated and discussed along with a real case study concerning the UAV flight over the Basilica di Santa Maria di Collemaggio in L'Aquila (Italy). The final result is a rigorous true-orthophoto used to inspect the roof of the Basilica, which was seriously damaged by the earthquake in 2009.

Conference paper (PDF, 1238 KB)


Citation: Barazzetti, L., Brumana, R., Oreni, D., Previtali, M., and Roncoroni, F.: True-orthophoto generation from UAV images: Implementation of a combined photogrammetric and computer vision approach, ISPRS Ann. Photogramm. Remote Sens. Spatial Inf. Sci., II-5, 57-63, https://doi.org/10.5194/isprsannals-II-5-57-2014, 2014.

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