3-D Convex Outputs for the Blind - Image Quality Analysis

Abstract

One of the means by which the blind communicate with the environment is text information in the Braille system and convex graphical images printed on the paper. Printing and reading 3-D images is of a special significance in the process of educating the blind. It is also used in any contact of the blind with the literature, in every-day life (e.g. convex guidebooks) and professional life (letters, documents, etc.).Because of a high diversification of the perception abilities of the blind as well as widespread application of the convex printings, the role of evaluating their quality becomes more significant. Quantitative measurements of the image quality of the convex printouts may be also used for evaluation of printing and copying devices.In the paper one analysed the main techniques of making 3-D printouts and copies for the blind. In the paper one proposed parameters for evaluating the quality of convex images and methodology of measuring them. One provided also preliminary results of measurements of these parameters. Results of the works carried out can be a basis for developing design of devices for printing in the Braille system and for convex copying.