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• Deep Learning Compensation of Rotation Errors During Navigation Assistance for People with Visual Impairments or Blindness

  Dragan Ahmetovic, Sergio Mascetti, Cristian Bernareggi, João Guerreiro, Uran Oh, Chieko Asakawa · 2019 · ACM Transactions on Accessible Computing (TACCESS)

  This paper addresses a critical but often overlooked problem in turn-by-turn navigation assistance for people with visual impairments or blindness (VIB): rotation errors at turning points. While much navigation research focuses on improving localization accuracy, this work…

  navigation assistance · visual impairment · blindness · deep learning · turn-by-turn navigation

• NavCog3 in the Wild: Large-scale Blind Indoor Navigation Assistant with Semantic Features

  Daisuke Sato, Uran Oh, João Guerreiro, Dragan Ahmetovic, Kakuya Naito, Hironobu Takagi, Kris M. Kitani, Chieko Asakawa · 2019 · ACM Transactions on Accessible Computing (TACCESS)

  This paper presents NavCog3, a smartphone-based indoor navigation assistant for people with visual impairments that combines high-accuracy Bluetooth beacon localization with rich semantic environmental features. The system uses off-the-shelf BLE beacons installed in the…

  indoor navigation · visual impairment · blindness · Bluetooth beacons · localization

• Turn Right: Analysis of Rotation Errors in Turn-by-Turn Navigation for Individuals with Visual Impairments

  Dragan Ahmetovic, Uran Oh, Sergio Mascetti, Chieko Asakawa · 2018 · Proceedings of the 20th International ACM SIGACCESS Conference on Computers and Accessibility (ASSETS '18)

  This paper examines a frequently overlooked problem in navigation assistance for blind and visually impaired (BVI) people: how accurately users execute rotation instructions during turn-by-turn guidance. While much research has focused on improving localization accuracy (knowing…

  navigation · blindness · orientation and mobility · indoor navigation · assistive technology

• Variability in Reactions to Instructional Guidance during Smartphone-Based Assisted Navigation of Blind Users

  Eshed Ohn-Bar, João Guerreiro, Kris Kitani, Chieko Asakawa · 2018 · Proceedings of the ACM on Interactive, Mobile, Wearable and Ubiquitous Technologies (IMWUT)

  This paper takes a close, sensor-level look at something most indoor-navigation research glosses over: how differently individual blind users actually react to the same spoken instruction. The authors instrumented a smartphone-and-BLE-beacon turn-by-turn system (based on NavCog)…

  indoor navigation · turn-by-turn navigation · blindness · visual impairment · assistive technology

• Modeling Expertise in Assistive Navigation Interfaces for Blind People

  Eshed Ohn-Bar, João Guerreiro, Dragan Ahmetovic, Kris M. Kitani, Chieko Asakawa · 2018 · Proceedings of the 23rd International Conference on Intelligent User Interfaces (IUI)

  This short IUI paper asks a question most assistive-navigation research leaves unasked: what happens as a blind user becomes an expert on a route? Existing smartphone guidance apps deliver the same instruction set on a user's tenth trip down a corridor as on their first,…

  blind navigation · indoor navigation · turn-by-turn navigation · visual impairment · blindness

• Environmental Factors in Indoor Navigation Based on Real-World Trajectories of Blind Users

  Hernisa Kacorri, Eshed Ohn-Bar, Kris M. Kitani, Chieko Asakawa · 2018 · Proceedings of the 2018 CHI Conference on Human Factors in Computing Systems

  This paper addresses a methodological blind spot in blind-navigation research: studies typically report localization accuracy and completion time, but say almost nothing about how the physical environment itself shapes where users go wrong. The authors argue that the same…

  indoor navigation · turn-by-turn navigation · blindness · visual impairment · assistive technology

• Achieving Practical and Accurate Indoor Navigation for People with Visual Impairments

  Dragan Ahmetovic, Masayuki Murata, Cole Gleason, Erin Brady, Hironobu Takagi, Kris Kitani, Chieko Asakawa · 2017 · Proceedings of the 14th International Web for All Conference (W4A)

  This paper presents improvements to the NavCog indoor navigation system that achieve sub-meter localization accuracy for blind pedestrians while significantly reducing the infrastructure cost of deploying BLE (Bluetooth Low Energy) beacon networks. GPS provides outdoor…

  indoor navigation · visual impairment · blindness · BLE beacons · Bluetooth Low Energy

• NavCog: A Navigational Cognitive Assistant for the Blind

  Dragan Ahmetovic, Cole Gleason, Chengxiong Ruan, Kris Kitani, Hironobu Takagi, Chieko Asakawa · 2016 · Proceedings of the 18th International Conference on Human-Computer Interaction with Mobile Devices and Services (MobileHCI '16)

  This paper introduces NavCog, an iPhone-based turn-by-turn navigation assistant designed to guide blind users through unfamiliar indoor and outdoor environments without requiring expensive infrastructure or structural modifications. The authors argue that while blind travellers…

  blind navigation · indoor navigation · wayfinding · orientation and mobility · assistive technology

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