The paper investigates the influence of lighting conditions on image-based 3D surface reconstruction, with particular focus on periodic photogrammetric surveys for monitoring and 3D mapping applications. The analyses focus on the accuracy and completeness of each DSM and the daily and hourly repeatability of repeated photogrammetric surveys. Three test sites with rock slopes with a different orientation to the sun and different slope characteristics (slope, pattern, amount of outcropping elements that cast shadows) have been considered to ensure that results can give a general indication of the behaviours in different light conditions. In addition, a simulated virtual test site is included in the study to allow controlled image acquisition and evaluate the effect of the sun's inclination on the DSM accuracy without influence of other weather conditions. The results show that, although there is an optimal time for the acquisitions, if particularly unfavourable light conditions are excluded, the accuracy reduction with time variation is always below 30%. The repeatability analyses by day and by time highlight a good consistence between DEMs belonging to the same day but acquired at different times and, also, between DEMs acquired at the same time but on different days. This suggests that reliable results can be obtained during continuous monitoring of, for instance, rock faces to identify rockfalls.

Influence of illumination changes on image-based 3D surface reconstruction / Bruno, N.; Giacomini, A.; Roncella, R.; Thoeni, K.. - In: INTERNATIONAL ARCHIVES OF THE PHOTOGRAMMETRY, REMOTE SENSING AND SPATIAL INFORMATION SCIENCES. - ISSN 1682-1750. - 43:(2021), pp. 701-708. ((Intervento presentato al convegno 2021 24th ISPRS Congress Commission II: Imaging Today, Foreseeing Tomorrow tenutosi a fra nel 2021 [10.5194/isprs-archives-XLIII-B2-2021-701-2021].

Influence of illumination changes on image-based 3D surface reconstruction

Bruno N.
;
Giacomini A.;Roncella R.;
2021

Abstract

The paper investigates the influence of lighting conditions on image-based 3D surface reconstruction, with particular focus on periodic photogrammetric surveys for monitoring and 3D mapping applications. The analyses focus on the accuracy and completeness of each DSM and the daily and hourly repeatability of repeated photogrammetric surveys. Three test sites with rock slopes with a different orientation to the sun and different slope characteristics (slope, pattern, amount of outcropping elements that cast shadows) have been considered to ensure that results can give a general indication of the behaviours in different light conditions. In addition, a simulated virtual test site is included in the study to allow controlled image acquisition and evaluate the effect of the sun's inclination on the DSM accuracy without influence of other weather conditions. The results show that, although there is an optimal time for the acquisitions, if particularly unfavourable light conditions are excluded, the accuracy reduction with time variation is always below 30%. The repeatability analyses by day and by time highlight a good consistence between DEMs belonging to the same day but acquired at different times and, also, between DEMs acquired at the same time but on different days. This suggests that reliable results can be obtained during continuous monitoring of, for instance, rock faces to identify rockfalls.
Influence of illumination changes on image-based 3D surface reconstruction / Bruno, N.; Giacomini, A.; Roncella, R.; Thoeni, K.. - In: INTERNATIONAL ARCHIVES OF THE PHOTOGRAMMETRY, REMOTE SENSING AND SPATIAL INFORMATION SCIENCES. - ISSN 1682-1750. - 43:(2021), pp. 701-708. ((Intervento presentato al convegno 2021 24th ISPRS Congress Commission II: Imaging Today, Foreseeing Tomorrow tenutosi a fra nel 2021 [10.5194/isprs-archives-XLIII-B2-2021-701-2021].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11381/2903354
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