I've been looking lately at attempted to use the n810 camera as a mouse.
Here's the basic idea.

The n810 camera, while low quality, should work fine to notice and track gross finger movements across the screen.

This would be handy for scrolling motions such as in the browser/microB.

Here's how I would expect it would work. A background process would watch the camera and notice wipe like motions (up / down / left /right) and translate them into events, either keyboard or touch screen equivalents.

Has anyone seen a project like this in the past or have suggestions for how to proceed?

Thanks,
Jeff