Experimental Ground Truths for Particle Tracking with Continuous Energy Minimization for the Study of Segregation in Bedload Transport

This dataset consists in two ground truths used for validation in the publication:

Frey, P., Ducottet, C., In revision. Particle Tracking with Continuous Energy Minimization for the Study of Segregation in Bedload Transport. Experiments in Fluids.

They are based on a subset of experimental video sequences recorded by Dudill et al. (2018) to study size segregation in bedload transport. Experiments consisted in mixtures of two-size spherical glass beads entrained by a turbulent free surface water flow over a mobile bed. The aim is to track all 5mm diameter coarse beads over time to obtain trajectories, particle velocities and concentrations, for studying size segregation in bedload and associated morphology.

This upload (5 files) consists for each ground truth in:

- two zipped video reference sequences of uncompressed tif images  recorded at 130 fps

• Low Fine Rate (LFR) case : 866 images extracted from experiment No.15 of Dudill et al. (2018): LFRrotIma5et1p5mm41pcent.zip
• High Fine Rate (HFR) case : 300 images extracted from experiment No.12 of Dudill et al. (2018): HFRsequence_2014_7_16_141530dia5etp9pcent69.zip

- two corresponding ground truth ‘.mat’ files giving all the trajectories of all coarse beads. They were obtained based on a tracking algorithm with subsequent expert modification. The tracking algorithm named OL-ST in the associated Frey and Ducottet article was developed by H. Lafaye de Micheaux et al. The code implementing the tracking algorithm is available on https://github.com/hugolafaye/BeadTracking. The ground truth is a '.mat' file containing  the variable 'trackData' being a cell array of tracking matrices. There is one tracking matrix for each image of the sequence : HFRtrackData-09-02-15-51_GT.mat and LFRtrackData-05-19_fr0-865_GT.mat

- a file readmeGT.txt giving complete information on data format

Important note: Experimental images were grabbed with the flow from right to the left implying for instance negative values for the x-coordinate of velocities. To comply with a traditional convention, images and associated results in the publication Frey and Ducottet are shown from left to the right.