Journal Article10.1680/GEOT.53.7.619.37383
Soil deformation measurement using particle image velocimetry (PIV) and photogrammetry
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TL;DR: A deformation measurement system based on particle image velocimetry (PIV) and close-range photogrammetry has been developed for use in geotechnical testing as mentioned in this paper.
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Abstract: A deformation measurement system based on particle image velocimetry (PIV) and close-range photogrammetry has been developed for use in geotechnical testing. In this paper, the theory underlying this system is described, and the performance is validated. Digital photography is used to capture images of planar soil deformation. Using PIV, the movement of a fine mesh of soil patches is measured to a high precision. Since PIV operates on the image texture, intrusive target markers need not be installed in the observed soil. The resulting displacement vectors are converted from image space to object space using a photogrammetric transformation. A series of validation experiments are reported. These demonstrate that the precision, accuracy and resolution of the system are an order of magnitude higher than previous image-based deformation methods, and are comparable to local instrumentation used in element testing. This performance is achieved concurrent with an order of magnitude increase in the number of meas...
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A four-step camera calibration procedure with implicit image correction
Janne Heikkilä,Olli Silven +1 more
- 17 Jun 1997
TL;DR: This paper presents a four-step calibration procedure that is an extension to the two-step method, and a linear method for solving the parameters of the inverse model is presented.
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A review of instrumentation for measuring small strains during triaxial testing of soil specimens
TL;DR: In this article, the authors present a survey of small-strain measuring devices and their modes of operation, benefits, capabilities, and limitations, as well as a classification of internal and external measuring devices.
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A Stero-Photogrammetric Method for Measuring Displacement Fields
TL;DR: In this article, a new whole field displacement measuring technique is described which is suitable for measuring planar displacements of any textured plane surface using ordinary photographs, taken from a fixed camera position, and a development of normal stereo-photogrammetric contouring procedures.
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Particle Motion Tracking Utilizing a High-Resolution Digital CCD Camera
Samuel G. Paikowsky,Fan Xi +1 more
TL;DR: In this article, a unique system has been developed capable of investigating the interparticle interaction in a two-dimensional array of ideal particles using high-resolution digital charge coupled device (CCD) camera and semi-automatic image processing and analysis algorithms.
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