Focus stacking photogrammetry for micro-scale roughness reconstruction

A methodological study

Journal article (2019)

Authors

Marcin Olkowicz National Research Institute
Marcin Dabrowski Universitetet i Oslo, National Research Institute
Anne Pluymakers Applied Geophysics and Petrophysics - CEG , Universitetet i Oslo
Research Group
Applied Geophysics and Petrophysics (CEG) (TU Delft)
Copyright: © 2019 Marcin Olkowicz, Marcin Dabrowski, Anne Pluymakers
DOI: https://doi.org/10.1111/phor.12270
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Published Date

2019

Language

English

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Faculty

Civil Engineering & Geosciences

Department

Geoscience and Engineering

Research Group

Applied Geophysics and Petrophysics

Abstract

In close-range applications, it is unclear whether optical photogrammetry is capable of accurately reconstructing submillimetre-scale roughness. This paper presents a study of fine-scale rock fracture roughness measurements with a careful assessment of the error. The workflow combines the techniques of structure from motion with focus stacking, using consumer-grade equipment and free or affordable software. The approach is tested firstly with synthetic data to check the influence of the number and position of cameras, object texture and image processing using focus stacking. Secondly, the optimised workflow is used to measure a natural shale rock fracture surface. To estimate the accuracy, the results were compared with a high-precision reference dataset provided by white-light interferometry. The standard deviation of error in the method is 6·5 μm, and is related with morphological structures with wavelengths below 150 μm and amplitudes smaller than 10 μm.

Files

Phor.12270.pdf
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- Embargo expired in 25-09-2019