before). Mistaken input due to instability in pointing is as follows 4 cases : R,T,R,V.
Toward this, the results of re-input using the discrimination formula (T1 = 0.2sec) showed that undesired data input caused by "pointing instability due to the tension or tremble " had dropped 25% as shown in Figure 3 (error: after).
Using the thinking described above, it was confirmed that a particular "discrimination formula" could be set for each disabled subject.
In addition to these time parameters, keyboard covers were useful to disabled subjects prone to shaking and rigidity. The usefulness of adjusting the size of the keyboard in accordance with the range of movement in the hand was also confirmed in tests.
We analyzed of key input movement characteristics, and parameters that control key input were decided. And we check that an input system suitable for users can be obtained through adjusting parameters.
Next, we researched how to set the discrimination formula from statistical processing that takes into account a wide range of input data, and we confirmed the improvement in key input.
More, we decided all the factors for the discrimination formula.
We consider to evaluation of an appropriate input system based on the set discrimination formula, and promote tests of other targets of research (switch, breathing, and voice input).
1. Arifuku, others: research into suitable input for users at communications terminalsstudy of a discrimination formula for judging keyboard input-, technical telecommunications information, TECHIMCAL REPORT OF IEICE, HCS9829(1998-09) pp. 73-80
2. Arifuku, others: research into suitable input for users at communications terminalsevaluation of particular discrimination formula for each user for key input (1)-, 13th, rehabilitation engineering conference paper ( 1998.8), pp.39-44
3. Yasuko Miyazaki, Kazuhiro Fujita ( 1995) Study of the key input confirmation time for cerebral palsy sufferers, 10th rehabilitation engineering conference paper, pp245-248, 1995
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Publication information: Book title: Human-Computer Interaction:Ergonomics and User Interfaces. Volume: 1. Contributors: Hans-Jörg Bullinger - Editor, Jürgen Ziegler - Editor. Publisher: Lawrence Erlbaum Associates. Place of publication: Mahwah, NJ. Publication year: 1999. Page number: 78.