January 9, 2014 report
New smartphone app helps blind find their way inside buildings
While it might seem that vision-based smartphones don't offer the blind much utility, researchers around the world have been proving such assumptions unfounded. Smartphones come with cameras that can be used to connect with image recognition software. Also, GPS coordinates can be connected to apps that read maps and send instructions out via the speaker. The problem with calling out directions via the speaker, though, is that sometimes there is other noise in the area that makes it difficult to hear what is being said. To get around that problem, the researchers on this new effort chose to use haptic feedback in a way that is already familiar to many people who use a cane to help them get around. The new app doesn't warn of objects in the path, but instead allows for following a predetermined path that is free of obstacles, ensuring a safe and direct route to a desired destination.
One impediment to the use of such an app is, of course, the lack of sites using the tape to guide users. Some sighted people may regard putting tape on the floor to serve as a guide to be unsightly. To get around that problem, the researchers are looking into adding infrared line recognition—the camera could see the lines, but people could not. While it's not clear if an arrangement could be made to incorporate the necessary floor tape in public spaces (similar to the removal of physical barriers for those in wheelchairs) it seems obvious that the app would be a major advancement for use in locations dedicated to serving the blind.
ARIANNA stands for pAth Recognition for Indoor Assisted Navigation with Augmented perception. It is a flexible and low cost navigation system for vi- sually impaired people. Arianna permits to navigate colored paths painted or sticked on the floor revealing their directions through vibrational feedback on commercial smartphones.
© 2014 Phys.org