simpletracker
This script aims at demonstrating the capabilities and the syntax of simpletracker.m, a MATLAB function dedicated to tracking.Tracking , or particle linking, consist in re-building the trajectories of one or several particles as they move along time. Their position is reported at each frame, but their identiy is yet unknown: we do not know what particle in one frame corresponding to a particle in the previous frame. Tracking algorithms aim at providing a solution for this problem.
simpletracker.m is - as the name says - a simple implementation of a tracking algorithm, that can deal with gaps. A gap happens when one particle that was detected in one frame is not detected in the subsequent one. If not dealt with, this generates a track break, or a gap, in the frame where the particule disappear, and a false new track in the frame where it re-appear.
simpletracker first do a frame-to-frame linking step, where links are first created between each frame pair, using the hungarian algorithm of hungarianlinker. Then a second iteration is done through the data, investigating track ends. If a track beginning is found close to a track end in a subsequent track, a link spanning multiple frame can be created, bridging the gap and restoring the track.
This scripts generate random points that more or less follow a given trajectories. They are scrambled, their position is perturbed by noise, and some of them are randomly erased in some frames. This is the first and longer part in the script
In a second time, the tracker tries to rebuild the tracks. This is made just by calling simpletracker with sensible parameters.
The third part is only about displaying results. The points are drawn with a text label next to them indicating to which frame they belong. Track are drawn in color.
More information can be found in the help section of the simpletracker and of the functions it calls, namely hungarianlinker and nearestneighborlinker.
这是什么方面的计算软件呢？
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