[nabs-l] FW: Virtual Maps For The Blind

[Sarah alawami]

Oone more time in case this didn't get throgh. it's not showing up in my
sent items.
 
 
 
ScienceDaily (Sep. 10, 2009) — The blind and visually impaired often rely on
others to provide cues and information on navigating through their
environments. The problem with this method is that it doesn't give them the
tools to venture out on their own, says Dr. Orly Lahav of Tel Aviv
University's School of Education and Porter School for Environmental
Studies.
 

To give navigational "sight" to the blind, Dr. Lahav has invented a new
software tool to help the blind navigate through unfamiliar places. It is
connected to an existing joystick, a 3-D haptic device, that interfaces with
the user through the sense of touch. People can feel tension beneath their
fingertips as a physical sensation through the joystick as they navigate
around a virtual environment which they cannot see, only feel: the joystick
stiffens when the user meets a virtual wall or barrier. The software can
also be programmed to emit sounds — a cappuccino machine firing up in a
virtual café, or phones ringing when the explorer walks by a reception desk.
 
Exploring 3D virtual worlds based on maps of real-world environments, the
blind are able to "feel out" streets, sidewalks and hallways with the
joystick as they move the cursor like a white cane on the computer screen
that they will never see. Before going out alone, the new solution gives
them the control, confidence and ability to explore new streets making
unknown spaces familiar. It allows people who can't see to make mental maps
in their mind.
 
Dr. Lahav's software takes physical information from our world and digitizes
it for transfer to a computer, with which the user interacts using a
mechanical device. Her hope is that the blind will be able to explore the
virtual environment of a new neighborhood in the comfort of their homes
before venturing out into the real world.
 
A touchy-feely virtual white stick
 
"This tool lets the blind 'touch' and 'hear' virtual objects and deepens
their sense of space, distance and perspective," says Dr. Lahav. "They can
'feel' intersections, buildings, paths, and obstacles with the joystick, and
even navigate inside a shopping mall or a museum like the Louvre in a
virtual environment before they go out to explore on their own."
 
The tool transmits textures to the fingers and can distinguish among
surfaces like tiled floors, asphalt, sidewalks and grass. In theory, any
unknown space, indoors or out, can be virtually pre-explored, says Dr.
Lahav. The territory just needs to be mapped first — and with existing
applications like GIS (geography information system), the information is
already there.
 
A new road to independence
 
The tool, called the BlindAid, was recently unveiled at the "Virtual
Rehabilitation 2009 International Conference," where Dr. Lahav demonstrated
case studies of people using the tool at the Carroll Center for the Blind, a
rehabilitation center in Newton, Massachusetts. There, a partially blind
woman first explored the virtual environment of the center — as well as the
campus and 10 other sites, including a four-story building. After just three
or four sessions, the woman was able to effectively navigate and explore
real-world target sites wearing a blindfold.
 
The virtual system becomes a computerized "white cane" for the blind, says
Dr. Lahav. "They get feedback from the device that lets them build a
cognitive map, which they later apply in the real world. It's like a
high-tech walking cane," she says. "Our tool lets people 'see' their
environment in advance so they can walk in it for real at a later time."
 
Today the blind and visually impaired are very limited in their movements,
which necessarily influences their quality of life. This solution could help
them find new options, like closer routes from train or bus stations to the
safety of home. "Ultimately, it helps the blind determine their own paths
and gives them the ability to take control of their lives," says Dr. Lahav,
who first began this research at Tel Aviv University, under Prof. David
Mioduser, where she now works. She then further developed it with her MIT
colleagues Dr. Mandayam Srinivasan and Dr. David W. Schloerb.