Parece haver um projeto que pode fazer o que você precisa: link
What's This Whole TIKISI Thing?
TIKISI is the name of the system we're working on to give blind and low vision users access to graphical information. It currently supports multitouch input, keyboard input, and speech input. For output, TIKISI supports visual and speech output, and we're very interested in working on Braille output as well; for example, to bluetooth braille displays, but this depends on what platform TIKISI is run on e.g. IOS, Android, Desktop, etc.