Billie Jean effect



  • For a assessment, I'm setting up an isadora stage. The purpose is as movement is detected where the white square is on screen, the square will appear and light up that part of the stage. Currently I'm struggling to figure out how to make the square not appear at the start of the scene, as well as this the square will redo its appearing animation if movement is detected in the square after its appeared 919e53-screen-shot-2015-02-06-at-11.20.15.png 81a0c6-screen-shot-2015-02-26-at-16.51.47.png



  • What do you mean:”as well as this the square will redo its appearing animation if movement is detected in the square after its appeared”?

    First you do not need to use Video In Watcher more than once unless you have more than one camera. 
    Then you can show(trigger) the square whenever you need.
    Search for background subtraction(tere is a sample patch)- it may help you to track movement when it happens better.


  • Look at this. Maybe this helps. 0852d7-square-tracking-test.izz


  • Tech Staff

    @1314266

    So do I understand that right, if nothing is detected in the upper left corner you don't see the square, if something enters that area the square appears if the area is left again the square dissapears? Or do you want the square to follow the movement of an object?

    Best
    Michel



  • your patch should work, but could be more simple. you could use your Difference into [Calc Brightness and Comparator] instead of Eyes, with an up envelope activated when the brightness goes over a certain threshold and a down envelope activated when it drops to zero. (assuming a person entering that area will continue some slight movement until they have left that area)



  • Michel, yes ideally if nothing is detected in that area the square won't be visible. Once something is detected in the area, the square appears and remains on a constant brightness. Currently the square has to be manually reset to zero intensity to begin with, and once it appears it will redo its appearance animation whenever movement is picked up in the area after its appearence. Cheers for your suggestions everyone!

    H T Warrell 

  • Tech Staff

    @1314266

    You are using the row col chg output but I would say use the enter and exit trigger outputs with the enter you trigger your envelope generator that goes from 0 to 100 and with the exit you trigger another envelope generator that goes from 100 to 0.

    Best
    Michel


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