Inlämning av Examensarbete / Submission of Thesis

Hossein Ghodosi Fard; Bie Chuangjun MCS-2011-12, pp. 68. COM/School of Computing, 2011.

The work

Författare / Author: Hossein Ghodosi Fard, Bie Chuangjun,
Titel / Title: Braille-based Text Input for Multi-touch Screen Mobile Phones
Abstrakt Abstract:

“The real problem of blindness is not the loss of eyesight. The real problem is the misunderstanding
and lack of information that exist. If a blind person has proper training and opportunity, blindness
can be reduced to a physical nuisance.”- National Federation of the Blind (NFB)
Multi-touch screen is a relatively new and revolutionary technology in mobile phone industry.
Being mostly software driven makes these phones highly customizable for all sorts of users
including blind and visually impaired people. In this research, we present new interface layouts
for multi-touch screen mobile phones that enable visionless people to enter text in the form of
Braille cells. Braille is the only way for these people to directly read and write without getting
help from any extra assistive instruments. It will be more convenient and interesting for them to
be provided with facilities to interact with new technologies using their language, Braille.
We started with a literature review on existing eyes-free text entry methods and also text input
devices, to find out their strengths and weaknesses. At this stage we were aiming at identifying
the difficulties that unsighted people faced when working with current text entry methods. Then
we conducted questionnaire surveys as the quantitative method and interviews as the qualitative
method of our user study to get familiar with users’ needs and expectations. At the same time we
studied the Braille language in detail and examined currently available multi-touch mobile phone
At the designing stage, we first investigated different possible ways of entering a Braille “cell”
on a multi-touch screen, regarding available input techniques and also considering the Braille
structure. Then, we developed six different alternatives of entering the Braille cells on the device;
we laid out a mockup for each and documented them using Gestural Modules Document and
Swim Lanes techniques. Next, we prototyped our designs and evaluated them utilizing Pluralistic
Walkthrough method and real users. Next step, we refined our models and selected the two bests,
as main results of this project based on good gestural interface principles and users’ feedbacks.
Finally, we discussed the usability of our elected methods in comparison with the current method
visually impaired use to enter texts on the most popular multi-touch screen mobile phone,
iPhone. Our selected designs reveal possibilities to improve the efficiency and accuracy of the
existing text entry methods in multi-touch screen mobile phones for Braille literate people. They
also can be used as guidelines for creating other multi-touch input devices for entering Braille in
an apparatus like computer.

Ämnesord / Subject: Datavetenskap - Computer Science\Effects on Society

Nyckelord / Keywords: Text entry, Multi-touch screen mobile phone, Braille

Publication info

Dokument id / Document id: houn-8gresb
Program:/ Programme Datavetenskapligt program/Computer Science
Registreringsdatum / Date of registration: 05/11/2011
Uppsatstyp / Type of thesis: Masterarbete/Master's Thesis (120 credits)


Handledare / Supervisor: Professor Bo Helgeson
Examinator / Examiner: Niklas Lavesson
Organisation / Organisation: Blekinge Institute of Technology
Institution / School: COM/School of Computing

+46 455 38 50 00
I samarbete med / In co-operation with: Synskadades Riksförbund (SRF)

Files & Access

Bifogad uppsats fil(er) / Files attached: bth2011hossein.pdf (3947 kB, öppnas i nytt fönster)