Nondestructive volumetric quantification of irregular shaped soil samples using close-range photogrammetry

Önal, Okan; Gharehaghajlou, A.

doi:10.1007/s41062-021-00470-8

Cited by 1 publication

(1 citation statement)

References 24 publications

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“…The specifications of the test environment are listed in Table 2. Calibration was conducted using Metashape Lens, a camera calibration module in Agisoft Metashape, which has been utilized for camera calibration in several close-range photogrammetry studies (Thoeni et al, 2014;Champion et al, 2015;An, 2017;Jurjevic and Gasparovic, 2017;Onal and Gharehaghajlou, 2021). Metashape Lens implements self-calibration based on the automatic measurement of the corner points of the checker cells.…”

Section: Application and Resultsmentioning

confidence: 99%

Improvement of an LCD-Based Calibration Site for Reliable Focus-Dependent Camera Calibration

Han

2022

KSCE Journal of Civil Engineering

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This paper proposes an improved calibration site design for reliable focus-dependent camera calibration in close-range photogrammetry. The proposed calibration site displays an adjustable checkerboard on a large liquid crystal display television (LCD TV), such that the same number of checker cells appear at the same position at any focusing distance. By adjusting the roll and pitch of the LCD TV bracket, various convergent angles were implemented in order to successfully conduct self-calibration. To obtain a greater depth of field and to facilitate reproducibility, the images were acquired using a small aperture from a camera that was firmly mounted on a distance-adjustable rail. The interior orientation parameters of the camera were estimated, and the estimation errors were assessed. The results revealed a flat error level for each focusing distance; thus, consistent reliability was achieved regardless of the focusing distance. Using the estimated parameters, a 3D measurement test was conducted, and the proposed method yielded 2% smaller root mean square error. The proposed method can be implemented easily and performs reliable and accurate focusdependent calibration.

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Section: Application and Resultsmentioning

confidence: 99%

Improvement of an LCD-Based Calibration Site for Reliable Focus-Dependent Camera Calibration

Han

2022

KSCE Journal of Civil Engineering

View full text Add to dashboard Cite

show abstract

Nondestructive volumetric quantification of irregular shaped soil samples using close-range photogrammetry

Cited by 1 publication

References 24 publications

Improvement of an LCD-Based Calibration Site for Reliable Focus-Dependent Camera Calibration

Improvement of an LCD-Based Calibration Site for Reliable Focus-Dependent Camera Calibration

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