Tracking of points

Hello everyone,
is there any "standard" algorithm for tracking a lower number of points (i.e. ~ 5 ) in a sequence of frames?
At the current point, I'm able to analyse a video stream and search for the center points of circles. Now i have to determine in each frame, which center point belongs to which circle - thats where i need to track these points.
Is this very complicated? I cant seem to find any method on the web on how to do this Oo
Thx a lot in advance!!
greets,
Binom

Hello Alan,
i must admit the "question" was a bit confusing.
What I am doing is capturing a real time video stream (a video file right now, but should be a stream from a camera in the real application) and analysing this stream frame by frame, or "picture by picture" as you can say. This is what I meant by calling these "frames".
I'm trying to track a special target, which is built out of 5 spheres in order to constantly track the position and direction of the target. There should be 4 cameras, each of these capturing a 2D view of the target (I dont have to care about the environment of the target, because i capture the spheres in infrared, so nothing else should be recorded).
So, i have to analyse each of those camera views in 2D - first step would be circle recognition (for the center points), this is something i hope that works just ok right now.( After analysing all 2D views I have to bring them togeteher(somehow^^) to calculate the 3D information [namely: position and direction] ). I search for the circle by using the DSJ Wrapper (a directshow wrapper for Java) to capture the video stream and then using some sort of "Flood Fill" algorithm on each frame to find the circles.
So the tracking of the center points is the challenging part of this: For each frame(or picture) from the video stream, i have the 2D position center points of the circles as x and y coordinates in the resolution of the picture in the video frame. By now, these coordinates are stored in an array. These are the points i need to track."Tracking" means i have to check which point in the array belongs to which sphere on the target. I know the relation of centers to sphere in the first frame (meaning at the start of the video i know which center belongs to which sphere), because this is a special initialization postiion. From this point on , the relation must be calculated by the tracking algorithm...
I only found one tracking concept, called "IPAN Tracker", but it seems to me a bit overloaded since i dont have such a great number of points to track and I wonder if there is an easier solution for just 5 points...
Thanks for reading all this, hope this wasnt too long Oo
greetings,
Binom
Edited by: ThirdBinom on Aug 22, 2008 5:25 AM

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