Palani, H. – VEMI Lab /vemi 91±¬ΑΟ Fri, 07 Jul 2017 15:25:50 +0000 en-US hourly 1 https://wordpress.org/?v=6.8.5 Visual, tangible, and touch-screen: Comparison of platforms for displaying simple graphics /vemi/publication/visual-tangible-touch-screen-comparison-platforms-displaying-simple-graphics/ Sun, 26 Jun 2016 18:51:55 +0000 /vemi/?post_type=publication&p=1287 Abstract:

Four different platforms were compared in a task of exploring an angular stimulus and reporting its value. The angle was explored visually, tangibly as raised fine-grit sandpaper, or on a touchscreen with a frictional or vibratory signal. All platforms produced highly accurate angle judgments. Differences were found, however, in exploration time, with vision fastest as expected, followed by tangible, vibration, and friction. Relative to the tangible display, touchscreens evidenced greater noise in the perceived angular value, with a particular disadvantage for friction. The latter must be interpreted in the context of a first-generation display and a rapidly advancing technology. On the whole, the results point both to promise and barriers in the use of refreshable graphical displays for blind users.

Citation: 

Gershon, P., Klatzky, R. L., Palani, H., & Giudice, N. A. (2016). Visual, tangible, and touch-screen: Comparison of platforms for displaying simple graphics. Assistive Technology. 28(1), 1-6.

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]]> Learning non-visual graphical information using a touch-based vibro-audio interface /vemi/publication/learning-non-visual-graphical-information-using-touch-based-vibro-audio-interface/ Thu, 02 Aug 2012 16:00:29 +0000 /vemi/?post_type=publication&p=1088 Abstract: This paper evaluates an inexpensive and intuitive approach for providing non-visual access to graphic material, called a vibroaudio interface. The system works by allowing users to freely explore graphical information on the touchscreen of a commercially available tablet and synchronously triggering vibration patterns and auditory information whenever an onscreen visual element is touched. Three studies were conducted that assessed legibility and comprehension of the relative relations and global structure of a bar graph (Exp 1), Pattern recognition via a letter identification task (Exp 2), and orientation discrimination of geometric shapes (Exp 3). Performance with the touch-based device was compared to the same tasks performed using standard hardcopy tactile graphics. Results showed similar error performance between modes for all measures, indicating that the vibro-audio interface is a viable multimodal solution for providing access to dynamic visual information and supporting accurate spatial learning and the deve

Citation: Giudice, N.A., Palani, H., Brenner, E., & Kramer, K.M., (2012). Learning non-visual graphical information using a touch-based vibro-audio interface. Proceedings of the 14th International ACM SIGACCESS Conference on Computers and Accessibility (Assets’12), Pp. 103-110).

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