research-article

PalmBoard: Leveraging Implicit Touch Pressure in Statistical Decoding for Indirect Text Entry

Authors:

Yuanchun ShiAuthors Info & Claims

CHI '20: Proceedings of the 2020 CHI Conference on Human Factors in Computing Systems

Pages 1 - 13

https://doi.org/10.1145/3313831.3376441

Published: 23 April 2020 Publication History

Abstract

We investigated how to incorporate implicit touch pressure, finger pressure applied to a touch surface during typing, to improve text entry performance via statistical decoding. We focused on one-handed touch-typing on indirect interface as an example scenario. We first collected typing data on a pressure-sensitive touchpad, and analyzed users' typing behavior such as touch point distribution, key-to-finger mappings, and pressure images. Our investigation revealed distinct pressure patterns for different keys. Based on the findings, we performed a series of simulations to iteratively optimize the statistical decoding algorithm. Our investigation led to a Markov-Bayesian decoder incorporating pressure image data into decoding. It improved the top-1 accuracy from 53% to 74% over a naive Bayesian decoder. We then implemented PalmBoard, a text entry method that implemented the Markov-Bayesian decoder and effectively supported one-handed touch-typing on indirect interfaces. A user study showed participants achieved an average speed of 32.8 WPM with 0.6% error rate. Expert typists could achieve 40.2 WPM with 30 minutes of practice. Overall, our investigation showed that incorporating implicit touch pressure is effective in improving text entry decoding.

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Cited By

Lertvittayakumjorn PCai SDou BHo CZhai S(2024)Can Capacitive Touch Images Enhance Mobile Keyboard Decoding?Proceedings of the 37th Annual ACM Symposium on User Interface Software and Technology10.1145/3654777.3676420(1-17)Online publication date: 13-Oct-2024
https://dl.acm.org/doi/10.1145/3654777.3676420
Moon HLiao YLi CLee BOulasvirta A(2024)Real-time 3D Target Inference via Biomechanical SimulationProceedings of the 2024 CHI Conference on Human Factors in Computing Systems10.1145/3613904.3642131(1-18)Online publication date: 11-May-2024
https://dl.acm.org/doi/10.1145/3613904.3642131
Yang YGuo BLiang YZhao KYu Z(2024)Cross-device free-text keystroke dynamics authentication using federated learningPersonal and Ubiquitous Computing10.1007/s00779-024-01832-628:3-4(491-505)Online publication date: 10-Sep-2024
https://dl.acm.org/doi/10.1007/s00779-024-01832-6
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Index Terms

PalmBoard: Leveraging Implicit Touch Pressure in Statistical Decoding for Indirect Text Entry
1. Human-centered computing
  1. Human computer interaction (HCI)
    1. Interaction techniques
      1. Text input

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cover image ACM Conferences

CHI '20: Proceedings of the 2020 CHI Conference on Human Factors in Computing Systems

April 2020

10688 pages

ISBN:9781450367080

DOI:10.1145/3313831

General Chairs:
Regina Bernhaupt
Eindhoven University of Technology, Netherlands
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Florian 'Floyd' Mueller
Monash University, Australia
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David Verweij
Newcastle University, UK
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Josh Andres
RMIT, Australia
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Program Chairs:
Joanna McGrenere
University of British Columbia, Canada
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Andy Cockburn
University of Canterbury, New Zealand
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Ignacio Avellino
University of Maryland Baltimore County, USA
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Alix Goguey
Grenoble Alpes University, France
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Pernille Bjørn
University of Copenhagen, Denmark
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Shengdong (Shen) Zhao
National University of Singapore, Singapore
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Briane Paul Samson
Future University Hakodate, Japan & De La Salle University, Philippines
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Rafal Kocielnik
University of Washington, USA

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Published: 23 April 2020

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Beijing Key Lab of Networked Multimedia
National Key Research and Development Plan
Natural Science Foundation of China

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CHI '20: CHI Conference on Human Factors in Computing Systems

April 25 - 30, 2020

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Cited By

Lertvittayakumjorn PCai SDou BHo CZhai S(2024)Can Capacitive Touch Images Enhance Mobile Keyboard Decoding?Proceedings of the 37th Annual ACM Symposium on User Interface Software and Technology10.1145/3654777.3676420(1-17)Online publication date: 13-Oct-2024
https://dl.acm.org/doi/10.1145/3654777.3676420
Moon HLiao YLi CLee BOulasvirta A(2024)Real-time 3D Target Inference via Biomechanical SimulationProceedings of the 2024 CHI Conference on Human Factors in Computing Systems10.1145/3613904.3642131(1-18)Online publication date: 11-May-2024
https://dl.acm.org/doi/10.1145/3613904.3642131
Yang YGuo BLiang YZhao KYu Z(2024)Cross-device free-text keystroke dynamics authentication using federated learningPersonal and Ubiquitous Computing10.1007/s00779-024-01832-628:3-4(491-505)Online publication date: 10-Sep-2024
https://dl.acm.org/doi/10.1007/s00779-024-01832-6
Yi XLiang CChen HSong JYu CLi HShi Y(2023)From 2D to 3DProceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies10.1145/35808297:1(1-25)Online publication date: 28-Mar-2023
https://dl.acm.org/doi/10.1145/3580829
Yi XZhang SPan ZShi LHan FKong YLi HShi Y(2023)Squeez’In: Private Authentication on Smartphones based on Squeezing GesturesProceedings of the 2023 CHI Conference on Human Factors in Computing Systems10.1145/3544548.3581419(1-15)Online publication date: 19-Apr-2023
https://dl.acm.org/doi/10.1145/3544548.3581419
Faleel SLiu YCody RRey BDu LYu JHuang DIrani PLi W(2023)T-Force: Exploring the Use of Typing Force for Three State Virtual KeyboardsProceedings of the 2023 CHI Conference on Human Factors in Computing Systems10.1145/3544548.3580915(1-15)Online publication date: 19-Apr-2023
https://dl.acm.org/doi/10.1145/3544548.3580915
Komninos A(2022)The Value of Open Data in HCI: A Case Report from Mobile Text Entry ResearchMultimodal Technologies and Interaction10.3390/mti60900716:9(71)Online publication date: 23-Aug-2022
https://doi.org/10.3390/mti6090071
Zhang MZhai SWobbrock J(2022)TypeAnywhere: A QWERTY-Based Text Entry Solution for Ubiquitous ComputingProceedings of the 2022 CHI Conference on Human Factors in Computing Systems10.1145/3491102.3517686(1-16)Online publication date: 29-Apr-2022
https://dl.acm.org/doi/10.1145/3491102.3517686
He ZLutteroth CPerlin K(2022)TapGazer: Text Entry with Finger Tapping and Gaze-directed Word SelectionProceedings of the 2022 CHI Conference on Human Factors in Computing Systems10.1145/3491102.3501838(1-16)Online publication date: 29-Apr-2022
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Zhang QWang DZhao RYu YJing J(2021)Write, Attend and SpellProceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies10.1145/34781005:3(1-25)Online publication date: 14-Sep-2021
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