My points tracker are too sensitive (how to fix it)

Hello, I would like to track 2 simple circles.

Before the code below I determine the centers of my 2 points (corresponding to barycentre1 & barycentre2 in my code).

The huge probleme is that my points tracker are too sensible. For example, when a brutal changement of luminosity occurs in my video (which is in real time), the positions of my points change and the trackers stop (I think it's because of the MaxBidirectionnalError which goes over 70).

My question is that : How can I change my code to avoid this problem? How can I change the sensibility of my tracking?

The second extra point is that when I compile the programm are there a difference beetween the coordinates of my points with the snapshot and in the video? I mean, if I have a point with the coordinates [100 450] in my snapshot, will the coordinates in my video will be the same after compiling ? (Because sometimes I observe this problem...)

Thanks for your answer.

% Capture one frame
    videoFrame = getsnapshot(vid);
    videoPlayer = vision.DeployableVideoPlayer('Name','Acquisition en cours...');

% Create point tracker
    pointTracker = vision.PointTracker('MaxBidirectionalError',70);
    initialize(pointTracker,[barycentre1 ; barycentre2],videoFrame);
    runloop=1;

      while runloop
          frame=getsnapshot(vid);
          point = step(pointTracker,frame);

          % define the marker
          out = insertMarker(frame,point,'+','Color','green');

          % Display the video
          step(videoPlayer,out);
          drawnow update
          if ~isOpen(videoPlayer)
              break
          end
      end
      release(pointTracker);
  end

[Stephen23]

I suspect "sensible" in the title should be "sensitive":

https://www.thelocal.fr/20160707/false-friends-france-english

[Arnaud Tullio]

Exactly, sorry...

Answer 1

[Zeinab Moradi]

it is my problem too,

vision.pointtracker can not track after a while

could you please help??!!