Augmented Reality and the base of the original ARToolkit has taken the flash world by storm with the FLARToolkit and really the speed updates of the AVM2 in Flash9 and Flash10 to be able to pull off the OpenCV calculations needed on the bitmap data from each frame of a camera. It has been around quite some time but now web based engines such as Flash and now Processing can take advantage of this awesome technology.

The Simple ARToolKit Library for Processing (PC) is just a basic port of single marker AR support and it currently only runs on windows.

Den Ivanov did some cool experiments with this kit but adding the capability to do multiple markers.  In his videos the processing runtime seems to process the render pretty quickly.  It seems that most Flash AR is around like 5-10 frames per second for the detection.

*mute the sound*

ARToolkit for processing tests from den ivanov on Vimeo.