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Modeling Two Dimensional Touch Pointing.

Yu-Jung Ko1, Hang Zhao1, Yoonsang Kim1

  • 1Department of Computer Science, Stony Brook University, Stony Brook, NY, United States.

Proceedings of the ACM Symposium on User Interface Software and Technology. ACM Symposium on User Interface Software and Technology
|July 30, 2021
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Summary
This summary is machine-generated.

This study generalizes Finger-Fitts Law to 2D touch pointing, improving models for touchscreen interfaces. The new 2D Finger-Fitts Law effectively addresses finger ambiguity and enhances pointing accuracy predictions.

Keywords:
Fitts’ lawfinger inputpointing models

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Area of Science:

  • Human-Computer Interaction
  • Usability Engineering
  • Ergonomics

Background:

  • Touch pointing is a fundamental user action on touchscreen devices.
  • Conventional Fitts' Law does not account for the 'fat finger' problem in touch interactions.
  • Finger-Fitts Law previously extended Fitts' Law to 1D touch pointing.

Purpose of the Study:

  • To generalize the Finger-Fitts Law to two-dimensional (2D) touch pointing.
  • To develop more accurate models for predicting touch pointing performance on touchscreens.
  • To enhance the design and development of intuitive touchscreen interfaces.

Main Methods:

  • Extended two prominent 2D Fitts' Law forms to incorporate finger ambiguity.
  • Utilized nominal target width and height for defining 2D pointing constraints.
  • Evaluated the derived 2D Finger-Fitts Law models against existing 2D Fitts' Laws.

Main Results:

  • The generalized 2D Finger-Fitts Law models effectively accommodate finger ambiguity.
  • Nominal target dimensions proved to be a simple and effective approach for 2D pointing.
  • The proposed 2D models demonstrated superior performance compared to existing 2D Fitts' Laws based on regression coefficients and information criteria.

Conclusions:

  • The developed 2D Finger-Fitts Law provides a principled and powerful framework for modeling touch pointing.
  • These models offer advancements in understanding touch pointing behavior.
  • The 2D Finger-Fitts Law serves as a foundation for improved touch interface design and research.