and for the very curious, my bachelor thesis is on shapecatcher, http://shapecatcher.com/B_Milde%20-%20On%20The%20Security%20Of%20reCAPTCHA%20-%20Bachelor%20The

and for the very curious, my bachelor thesis is on shapecatcher, http://shapecatcher.com/B_Milde%20-%20On%20The%20Security%20Of%20reCAPTCHA%20-%20Bachelor%20Thesis.pdf http://shapecatcher.com/B_Milde%20-%20On%20The%20Security%20... There is a whole chapter on shape contexts in it, which I use with shapecatcher, too.