Commercial Braille Recognition SoftwareOptical Braille Recognition (Neovision) is a Windows software that translates the Braille information into plain texts. The price is 895 EUR and it’s one and only one I can find in the Web.
Companies such TVI, SNOW, Karishma Enterprises, Index Braille and Accessibility (M) Sdn Bhd also sells OBR, but they seem to be local distributors of Neovision’s OBR
Some Research Works A. Antonacopoulos and D. Bridson, "A Robust Braille Recognition System," in Document Analysis Systems VI, 2004, pp. 533-545. http://usir.salford.ac.uk/1815/ http://www.springerlink.com/content/b335hyg2qp4r62nm
“an inexpensive flatbed scanner is used and the system requires minimal interaction with the user.” S. Zhang and K. Yoshino, "A Braille Recognition System by the Mobile Phone with Embedded Camera," 2007, pp. 223-223. http://doi.ieeecomputersociety.org/10.1109/ICICIC.2007.4
Braille Sensing with Tactile SensorsIn my opinion, most tactile or touch sensors are not suitable to digitally scan Braille characters due to the lack of sensing resolution. But researchers at MIT has showed off new kind of tactile sensor called GelSight at SIGGRAPH 2009. As shown in figures below, the sensing resolution is high enough to be applied to Braille scanning. In addition, developers say that the sensor can be made big. I think GelSight might be a good solution to recognize analogue Braille documents.
[Figures from : A. Raj, M. Johnson, and E. Adelson, "An interactive retrographic sensor for touch, texture, and shape," 2009, p. 15. http://people.csail.mit.edu/kimo/publications/retrographic/sensor.pdf]