As the titles says, I am trying to compare a live video stream to a saved picture in a data file, then display a letter character on screen.  Something like a sign language translator.  My current code outlines an object or body part. 

I know this is possible using matlab and other signal processing software but is this even possible with processing. I have searched the forum but can not find any advice.. 

I will take any advice or suggestions. Thanks in advance.