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Index › Programming Questions & Help › Syntax Questions › Selecting half the window
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Selecting half the window (Read 600 times)
noche.sucio
Selecting half the window
May 10th, 2010, 11:26am  
Hello all,

I'm attempting to use frame differencing to have movement trigger some actions.  The problem I am running across is that my video capture image is on the right hand side of the window, while I have a running movie on the left.  Thus, my frame differencing syntax is seeing this running movie as movement.  Is there anyway, via array math or whatever, to select the pixels on just the right side of the screen?  Thank you very much for your help.
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Smitty
Re: Selecting half the window
Reply #1 - May 10th, 2010, 12:12pm  
Two options I can think of:

The copy() method can be used to copy pixels from one image to another.  So, you could create a PImage the size of the frame-capture area, copy the frame capture images to the PImage each frame, and run the frame-differencing algorithm on that.  Or some other variation, like have your video playback render to a separate image, and run the frame-differencing algorithm on the main window, then paste the video image in at the end of each frame just before you show it to the user.

Or you could use the napplet library to set up two separate "sub sketches" that display side by side in the same window.  (Disclaimer: They say when you have a hammer, every problem looks like a nail, and I happen to be the inventor of this particular hammer.  But this really is exactly the sort of thing I had in mind for napplet.)
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