Reconstruction of small components using photogrammetry: A quantitative analysis of the depth of field influence using a miniature step gauge

Maria Grazia Guerra*, Luigi Maria Galantucci, Fulvio Lavecchia, Leonardo De Chiffre

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

Abstract

In this work, authors investigated the effect of the Depth of Field (DoF) reduction, arising when the acquisition of small objects is carried out with a photogrammetry-based system using a Digital Single Lens Reflex (DSLR) camera and the structure from motion (SfM) algorithm. This kind of measuring instrument is very promising for industrial metrology according to the paradigms of the fourth industrial revolution. However, when increasing the magnification level, necessary for the reconstruction of sub-millimetric features, there is a corresponding decrease of the DoF, leading to possible effects on the reconstruction accuracy. Thus, the effect of the DoF reduction was analysed through the reconstruction of a well-known artefact: the step gauge. The analysis was conducted considering the theory behind the DoF concept, the analysis of the 2D images, input of photogrammetric reconstruction and, finally, the results in terms of dimensional verification of the reconstructed step gauge.

Original languageEnglish
JournalMetrology and Measurement Systems
Volume28
Issue number2
Pages (from-to)323-342
ISSN0860-8229
DOIs
Publication statusPublished - 2021

Keywords

  • Depth of field
  • Dimensional accuracy
  • Flatness
  • Metrology of small parts
  • Miniature step gauge
  • Photogrammetry
  • Uncertainty

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