Turn right: Analysis of rotation errors in turn-by-turn navigation for individuals with visual impairments

Dragan Ahmetovic, Sergio Mascetti, Uran Oh, Chieko Asakawa

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

16 Scopus citations

Abstract

Navigation assistive technologies aim to improve the mobility of blind or visually impaired people. In particular, turn-by-turn navigation assistants provide sequential instructions to enable autonomous guidancetowardsadestination.Aproblem frequently addressed in the literature is to obtain accurate position and orientation of the user during such guidance. An orthogonal challenge, often overlooked in the literature, is how precisely navigation instructions are followed by users. In particular, imprecisions in following rotation instructions lead to rotation errors that can significantly affect navigation. Indeed, a relatively small error during a turn is amplified by the following frontal movement and can lead the user towards incorrect or dangerous paths. In this contribution, we study rotation errors and their effect on turn-by-turn guidance for individuals with visual impairments. We analyze a dataset of indoor trajectories of11 blind participants guided along three routes throughamulti-story shopping mall using NavCog, a turn-by-turn smartphone navigation assistant. We find that participants extend rotations by 17° on average. The error is not proportional to the expected rotation; instead, it is accentuated for "slight turns"(22.5°-60°), while "ample turns"(60°-120°)are consistently approximated to 90°.We generalize our findings as design considerations for engineering navigation assistance in real-world scenarios.

Original languageEnglish
Title of host publicationASSETS 2018 - Proceedings of the 20th International ACM SIGACCESS Conference on Computers and Accessibility
PublisherAssociation for Computing Machinery, Inc
Pages333-339
Number of pages7
ISBN (Electronic)9781450356503
DOIs
StatePublished - 8 Oct 2018
Event20th International ACM SIGACCESS Conference on Computers and Accessibility, ASSETS 2018 - Galway, Ireland
Duration: 22 Oct 201824 Oct 2018

Publication series

NameASSETS 2018 - Proceedings of the 20th International ACM SIGACCESS Conference on Computers and Accessibility

Conference

Conference20th International ACM SIGACCESS Conference on Computers and Accessibility, ASSETS 2018
Country/TerritoryIreland
CityGalway
Period22/10/1824/10/18

Keywords

  • Navigation Assistive Technologies
  • Orientation and Mobility
  • Visual impairments and Blindness

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