Introduction Sensitive fingers of blind readers were the only decoding tool and quality evaluation measure of embossed Braille until present. It uses a standard flatbed scanner and a standard PC computer. Sighted people receive a tool for easy communication with the Braille world. Producers of Braille prints are offered ways how to decrease material and maintenance expenses by introducing new methods of objective Braille dot and Braille paper quality characterization. Recognition is slow and tiring, but possible.
Similar information is available from the standard flatbad scanner.
Results of transfer of the tiring job to the computer are presented in this article. Image of a dot formed towards the scanner window differs from the image of dot formed backwards. Thus, the picture of embossed Braille sheet captured by a standard flatbed scanner contains information about the Braille coded text. Its design is based upon advanced methods of mathematics, statistics and computer vision. The Braille dots embossed on the same side of paper perform pictures similar each other.