detect presense and motion tracking help needed

    Aug 05 2006 | 8:00 am
    I would like to set up a presence detecting/motion tracking module for an installation. I thought I can use the cv.jit objects by J.M> Pelletier []. But i'm a beginner, so I would need some help or advice. I know how to set it up ideally, not really practically. I only have the basic done so far: - grab the image, then use greyscale, then to get a better image for tacking. I guess the idea would be to compare frames, so that new objects woud be detected, then group the deteced pixel into big dots, so that each person would correspond to a dot, then track the x/y position of these dots, and get their number. Another possible idea would be to get their relative position. Any help would be appreciated to implement that. Thanks.

    • Aug 05 2006 | 3:28 pm
      I just came across the Eyes package, but haven't tried it out. Looks promising for this kind of thing--tracking multiple blobs, etc. Another solution is to run EyesWeb (if you have a WinXP-capable box), and OMS the data to Max.
      I also haven't delved deeply into the cv tools, so I can't help you there, but I suspect that, if Eyes is stable, then it might be a more robust solution. Does anyone have any experience with it?
      The usual process goes something like this: capture the scene without the bodies you want to track so you can do a background subtraction on the subsequent capture. Convert to greyscale, then let the software ascertain blobs. Once it identifies them, it should be able to give you all kinds of parameters such as center of gravity, bounding box dimensions, contraction index, quantity of motion, etc. The trick is with the capacity of the software to deal with multiple blobs and not loose track of them. EyesWeb is build from the beginning to deal with the human form, so it is ideal for this kind of work. It looks as if Eyes attempts to do the same, but I have no idea as to its effectiveness.
    • Aug 06 2006 | 7:19 am
      Thanks. But I cannot run winXP, so I guess that this won't work this time. still looking...
    • Aug 19 2006 | 4:55 pm
      hey thanx for the tip, EyesWeb seems to be what I was looking for ! i am a PC user and was hoping to one day find a PC version of david rokeby's softvns...I don't think it will happen dough. If annyone has more tips on motion tracking or detection in Jitter or anny other soft like EyesWeb, please keep me posted !
      Cheers, Charles
    • Aug 21 2006 | 8:17 am
      Hey cedric,
      since i have problems to post messages here, dont know why..and i already wrote a lot stuff, you get some short info this time...:(
      1. > 2up.jit.centroids is an external that we will use in our interactive to track a lot of objects
      2. > Standalone tool that seems to run stable
      Give it a try and good luck!
      Daniel -- visit: