Video geometry distortion

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http://www.unix.com – Hi there, I need an expert to get started with output video distortion. I have a box that needs to display a roughly 4000px * 1000px window (it's basically a web page). The problem is that the image is then projected on a wall that is not really flat. So basically, I'm wondering if I can find a piece of software that can take a video input and distort it before sending it to the graphic card so that the image looks flat on a weird wall. I'm a complete newbie in that subject. I have studied hardware solutions where I just send one video signal to another machine that creates the distortion a (HowTos)