About 314 million people are visually impaired worldwide, 45 million of them are blind. About 85% of the world’s visually impaired live in developing countries. Around 1.4 million children under age 15 are blind.

For the blind students, they can read the Braille to learn the knowledge; it is hard to understand the shape information, such as graphics in mathematics, physics, art, etc. …

Tactile device is one of the most important and most essential to perceive and deliver the graphics information for the visually impaired people

Based on an initial user study carried out in a school for the blinds which helps us refine the basic elements and units about how materials show semantic information using tactile attributes instead of visual forms, we build Pixie, an 80*64 tactile graphic display, utilizing Shape Memory Alloy technique.

System overview

For the signal processing part, we use several image processing methods to generate pictures which are easy to present on the tactile display with lots of sematic information.

For the hardware, we send the processed image information to the device via Bluetooth, which will activate the micro-controller to actuate the Shape Memory Alloy to react.

Author: admin on March 8, 2014

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