I would like to identify for example the letter A drawn by a finger. Gesture doesn't work as it's dependent on the way you draw the shape and seems not to work if you lift your finger (as far as I can tell). I want to have some learning programs for kids to draw letters and for Lua code to be able to examine them. For many use cases this is just as useful as physics is.

Would like to see a library such as these supported
http://luaforge.net/projects/luatesser/
http://code.google.com/p/ocropus/