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Most experiments study a model 2 dimensional (2D) granular system composed of circular discs as grains. With a digital camera, the first and one of the most important information that can be obtained is particle positions. Particle detection and tracking alone provide rich information such as particle configuration and flow field, and are necessary for further measurements like force-bearing contact detection and contact force calculation. In this session, a detailed description for detecting particle positions and orientations and tracking particles in high resolution images will be summarized below. In addition, in images with resolution that is not high enough to precisely detect particle positions, another method (PIV) will be introduced.
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Most experiments study a model 2 dimensional (2D) granular system composed of circular discs as grains. With a digital camera, the first and one of the most important information that can be obtained is particle positions. Particle detection and tracking alone provide rich information such as particle configuration and flow field, and are necessary for further measurements like [force-bearing](https://git-xen.lmgc.univ-montp2.fr/PhotoElasticity/Main/wikis/gradient-analysis), contact detection and contact [force calculation](https://git-xen.lmgc.univ-montp2.fr/PhotoElasticity/Main/wikis/inverse-analysis). In this session, a detailed description for detecting particle positions and orientations and tracking particles in high resolution images will be summarized below. In addition, in images with resolution that is not high enough to precisely detect particle positions, another method (PIV) will be introduced.
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