I have recently made an AS3 IR Led tracker for this whack-a-Pyramid game, where children stamp a pyramid model onto a projected table surface to catch a pyramid as the Nile scenery passes by. As i only need to track one LED i decided to do all the tracking within the adobe air framework and found this method for the tracking – http://play.blog2t.net/fast-blob-detection. I have simply adapted this method to include some camera calibration (see below). (Threshold, flip axis, and X and Y offsets calibration).
All this does is save an XML file to the documents directory and the main app then uses the same data and tracking class. In this example i am just using my DVD remote control.