Ashish Derhgawen has done lots of interesting work with vision. You can see all of his projects on his Ashish’s Programming Journal. Best of all the vision is captured with a simple webcam which makes these projects possible for any hobbyist. Here are a few links to my favorite projects of his.
Laser Pointer used as a Mouse (first video).
Pan Tilt Webcam using a Mouse (second video). This project uses a Pan Tilt module from our friends over at Trossen.
Cell Phone Controlled Door (third video) Not a webcam vision project but too cool to leave out. 🙂
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Cool, but what does a cell-phone-controlled lock have to do with a webcam?
I wonder if you could point the webcam at the screen, and actually be able to point at things on the screen to click them.
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Very true, I was originally only going to reference the first two projects but the third was too good to leave out. So I guess it is an unrelated bonus. 🙂