This article describes an experimental system for administering multiple-choice math tests to students who are visually impaired or otherwise print disabled. Using a new audio-tactile computer peripheral device called the Talking Tactile Tablet, the authors created a preliminary version of a self-voicing test that included 12 items, all of which referred to a graphical element. Users could take the test, working through the items at their own speed and learning about associated tactile graphic diagrams by pressing on various features to hear appropriate audio descriptions.
We propose a new approach for converting graphical and pictorial information into tactile patterns that can be displayed in a static or dynamic tactile device. The key components of the proposed approach are (1) an algorithm that segments a scene into perceptually uniform segments; (2) a procedure for generating perceptually distinct tactile patterns; and (3) a mapping of the visual textures of the segments into tactile textures that convey similar concepts. We used existing digital halftoning and other techniques to generate a wide variety of tactile textures. We then conducted formal and informal subjective tests with sighted (but visually blocked) and visually-impaired subjects to determine the ability of human tactile perception to perceive differences among them. In addition to generating perceptually distinguishable tactile patterns, our goal is to identify significant dimensions of tactile texture perception, which will make it possible to map different visual attributes into independent tactile attributes. Our experimental results indicate that it is poosible to generate a number of perceptually distinguishable tactile patterns, and that different dimensions of tactile texture perception can indeed be identified.
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