Bead tracking experimental ground truth for studying size segregation in bedload sediment transport

Video sequences to study size segregation in bedload transport were recorded. Experiments consisted in mixtures of two-size spherical glass beads entrained by a turbulent supercritical free surface water flow over a mobile bed. The aim is to track all beads over time to obtain trajectories, particle velocities and concentrations, for studying bedload granular rheology, size segregation and associated morphology. This upload consists in : a 1000-frame experimental image sequence recorded at 130 fps with approximately 400 beads per frame (about 300 coarse and 100 small beads). The image resolution is 1280x320; the ground truth in the directory \result . It was obtained based on a tracking algorithm with subsequent expert modification. The tracking algorithm 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 in particular the variable 'trackData' being a cell array of tracking matrices. There is one tracking matrix for each image of the sequence. Complete information on data format is given in the file readme.txt in the github BeadTracking package. In addition it contains three files allowing the user to run the BeadTracking package specifically on the experimental sequence : sequence_param.txt : parameter file sequence_base_mask.tif : to remove the base template_transparent_bead_rOut10_rIn6.mat : a template for bead detection用于研究推移质输运（bedload transport）中粒度分离现象的视频序列已完成录制。本实验以两种粒径的球形玻璃珠混合体系为研究对象，在可动床面上利用湍流超临界自由表面水流裹挟颗粒运动。本数据集旨在逐帧追踪所有玻璃珠的运动过程，以获取其运动轨迹、颗粒速度与浓度数据，进而研究推移质颗粒流变学、粒度分离特性及其关联的床面形貌。 本次上传包含一段1000帧的实验图像序列，采集帧率为130 fps，每帧约含400颗玻璃珠（其中粗颗粒约300颗，细颗粒约100颗）。图像分辨率为1280×320；配套真值标签存储于result目录中，其生成基于经专家后续修正的追踪算法。该追踪算法由H. Lafaye de Micheaux等人开发，对应的算法实现代码可在https://github.com/hugolafaye/BeadTracking获取。真值标签为.mat格式文件，其中包含名为'trackData'的变量，该变量为追踪矩阵的元胞数组，序列中每一幅图像对应一个追踪矩阵。关于数据格式的完整说明可参阅BeadTracking代码包中的readme.txt文件。此外，本次上传还包含三个可用于在该实验序列上直接运行BeadTracking代码包的文件： 1. sequence_param.txt：参数配置文件 2. sequence_base_mask.tif：背景去除模板文件 3. transparent_bead_rOut10_rIn6.mat：颗粒检测模板文件