Assistive tech for people with visual impairments to identify scientific images on a computer screen
Purdue University researchers are developing software in a "haptic device" that could give people with visual impairments the ability to identify scientific images on a computer screen using their other senses.
Ting Zhang, a graduate student in the Purdue School of Industrial Engineering, is developing a system that involves a specially designed joystick attached to a computer. The joystick controls a cursor. When the cursor moves across an object on the screen, force feedback, vibrations and sound cues give the user information about the object's size, shape, texture and color to help them identify the information displayed on a computer screen.
Working under the guidance of Brad Duerstock, associate professor of engineering practice in the School of Industrial Engineering and Weldon School of Biomedical Engineering, and Juan Wachs, associate professor in the School of Industrial Engineering, Zhang is trying to address the number of students with visual impairments who become involved in STEM studies. A 2014 National Science Foundation publication reports that no more than 1 percent of people who are visually impaired are involved in advanced science and engineering research and receive doctoral degrees.
"How science is conducted and how findings are typically represented is usually quite visual, making it difficult for students with visual impairments," Duerstock said.
"We're hoping this technology can be used by schools in the future to assist students with visual impairments study science," Zhang said
Conventional methods to assist such students include printing tactile representations of computerized images on expensive 3-D sheets of material.
"The method is much less expensive and allows a person to directly interface with a computerized image using a haptic device and other sensory interfaces," Duerstock said.
Haptic devices are handheld devices that give users feedback with forces when used with a computer system, such as controllers common with modern home video game systems.
David Schwarte, assistive technology specialist for Information Technology at Purdue, or ITaP, has been testing the system with Duerstock and Wachs' team. He has a visual impairment.
"I think this has a possibility of making things easier for people with a visual impairment," Schwarte said. "The big advantage is that it's electronic and more real time."
In addition to students of all ages, Zhang believes the system would be useful for scientists with visual impairments.
"We think the technology could be extended to other users as well, such as people without disabilities needing to get details about objects that only exist in the virtual state," Zhang said.
Duerstock and Wachs' team has a working prototype of the system and plans to do field trials this summer. The team also is looking for collaborators and investors to expedite the commercialization of the technology.
Zhang also plans to create a startup company to market the technology.