Home // International Journal On Advances in Intelligent Systems, volume 11, numbers 3 and 4, 2018 // View article
Authors:
Yoshihiko Nomura
Yoshiaki Kashino
Tokuhiro Sugiura
Keywords: tactile sensation; slippage; interface; multiple strokes; presentation and recognition strategy
Abstract:
The objective of this study is to examine presentation strategies for line-drawing recognition by using a finger-tactile interface, i.e., an “active-wheel mouse,” which can present slippages to users via users’ fingertip skin. The interface embodies an active wheel being rotatable in any direction, with any speed and for any time-duration. Through the slippage stimuli, the interface can present stroke motions with any direction, velocity and length to users. In this paper, we proposed two kinds of presentation strategies, called an “after-recognition-go strategy” and a “while-perceiving-go strategy” for single-stroke line-drawings. The former strategy employs an open-loop control scheme with no-feedback, and the latter one does a closed-loop control scheme with online-feedback. Next, the perceptual performances were compared between the two strategies via a psychophysical experiment, in which single-stroke line-drawing consisting of up to three straight-line segments were recognized. In the experiment, the length, direction, and velocity were randomly chosen within 50 - 150 mm, 0 - 359 deg, and 12 - 50 mm/s, respectively. In order to examine performance, we introduced objective and subjective evaluation values. As for the objective evaluation variables, the mean and the variance were calculated for (root mean squared errors (RSMEs) of the motion-related variables such as lengths, angles, and mean-velocities and for RSMEs of the time-durations, while, as for the subjective evaluation variable, questionnaire survey was conducted. As a result of the experiment, in comparison with the while-perceiving-go strategy, the after-recognition-go strategy was recommended for further development of the finger-tactile interface, based on the significant reduction of time-duration and on no mental-fatigue reports in a questionnaire: in the case of for the after-recognition-go strategy, the means and the standard deviations of RSMEs were -19.3 ± 40.7 mm (for length), 5.0 ± 15.9 degree (for angle), and 9.2 ± 22.3 mm/s (for mean-velocity).
Pages: 290 to 298
Copyright: Copyright (c) to authors, 2018. Used with permission.
Publication date: December 30, 2018
Published in: journal
ISSN: 1942-2679