Flash Webcam Motion Detection

I need to make an interactive application through a webcam using actionscript 2. I already make the camera detection and the movement detection (http://www.franciscoalmeida.com/camera/testwcam.html), but i really need to know how make the color extraction and to identify some points of collision like the examples 3 (Tocando teclado (tem som)) and 5 (Detecção de cor) the following link:


If you can give me a tutorial how i make it :)
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Maybe the technique used in this article would help you on achieving your goal...  

Flash 8: Realtime Video Color Keying


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