A few years ago I worked on a digitized whiteboard system that could be projected onto any surface. Took input from a Kinect, or other input system and recorded

A few years ago I worked on a digitized whiteboard system that could be projected onto any surface. Took input from a Kinect, or other input system and recorded the history of the entire life of the canvas into a database that could be exported. Even recorded audio and video for final conclusions and wrap up. I think we learned a lot of HCI lessons from that project, mostly about guerilla arm. Smart boards can already do what you're looking for but they're insanely expensive and far from portable which is what we we're tasked to "beat". Oh, forgot the best part, they were networked ,~20 tables at a time and used a server to facilitate connections and store sessions between each other. Point being, what you're looking for exists but is expensive or requires some custom development of your own. I'd open source mine but my grant won't let me do that.