BRAI 3 盲文检测系统

Braille Labeling of Medicines: Meeting Directive 2004/27/EC
A new European Directive places obligations on the marketing holder of medicinal products for human use concerning the provision of Braille labels. The implementation date is 30th October 2005 for medicinal products approved after this date. The directive applies to all medicinal products starting with 30th October 2010. For the user, the key items on the label are product name, dosage and expiry date.
Braille characters consist of one to six embossed dots which can have 64 different configurations. There are various standards for the size, the spacing and the height of the dots. Most Braille producers in the UK use the Standard American dimensions rather than the English Interpoint dimensions. The EC Guidance recommends the use of Marburg Medium Braille cell size.
A significant problem with Braille is the lack of redundancy in the system.
This means that a single not recognized dot can completely change the
meaning. This has implications for Braille medicine labels since a change
in meaning could have serious consequences for the user.
Braille is usually produced by embossing dots on long-fiberfibre paper. To lessen the risk of dots becoming damaged, the traditional approach has been to spray the back of the paper with shellac. An alternative is to emboss the Braille on plastic sheets but most computer-controlled Braille embossers output on paper not plastic.
The embossing technology destroys the structure of the paper and therefore the readability of the Braille text over time is limited. A new ink jet like technology is now available to print directly Braille labels with dynamic content. This is important especially when printing expire dates. Quickly drying Ink with high viscosity is applied on any possible substrate (paper, plastic, thick plastic, wood, etc), forming a Braille dot.
A Study of Legible Braille Patterns on Capsule Paper: Diameters of Braille Dots and Their Interspaces on Original Ink-printed Paper
WATANABE Tetsuya and OOUCHI Susumu have studied the implications of Braille dot characteristics to the readability of the text in terms of speed and errors. The outcome of the study shows a strong implication of dot diameter, inter dot space and dot height to the readability of the text. In addition the dot shape has a considerable impact on the readability of the text: high, un-sharp dots could be less readable than small-sharp dots.