View Full Version : Tracking application

May 14, 2005, 06:17:46
I'm looking for a suggestion:

I am trying to track a ball moving across a fixed background.

I have successfully isolated the ball by splitting my source video, and putting a delay on one of the splits, then sending the original and the delayed feed into the absolute difference filter.

The output is my moving ball isolated in a nice black background.

How can I now get the x,y coordinates and size of this object? The Blob Finder doesn't seem to pick it up.

Thanks for any suggestions!

Bernd Peretzke
May 17, 2005, 14:01:07

The MV Blob Finder should do this job. Have you played around with the pre-processing parameter, like threshold ...?
Maybe you could post an image from your ball.


May 20, 2005, 05:05:17
Thanks Bernd - that worked after some trial and error.

Is there more documentation about the Blob Pre Processing parameters? I only found a phrase about each parameter in the documentation.