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• Evaluating Intelligibility and Battery Drain of Mobile Sign Language Video Transmitted at Low Frame Rates and Bit Rates

  Jessica J. Tran, Eve A. Riskin, Richard E. Ladner, Jacob O. Wobbrock · 2015 · ACM Transactions on Accessible Computing (TACCESS)

  This paper investigates the lower limits of intelligible sign language video on mobile devices, seeking to determine the minimum frame rate and bit rate that still allow deaf users to understand ASL video conversations. Mobile video communication is essential for deaf and…

  deaf and hard of hearing · sign language · video communication · mobile accessibility · bandwidth

• A Web-Based Intelligibility Evaluation of Sign Language Video Transmitted at Low Frame Rates and Bitrates

  Jessica J. Tran, Rafael Rodriguez, Eve A. Riskin, Jacob O. Wobbrock · 2013 · Proceedings of the 15th International ACM SIGACCESS Conference on Computers and Accessibility (ASSETS)

  This paper evaluates the perceived lower limits of intelligible sign language video for mobile communication, testing how much video quality can be sacrificed while maintaining comprehensibility for ASL users. The ITU-T recommends sign language video be transmitted at 25 fps at…

  sign language · American Sign Language · deaf accessibility · video compression · frame rate

• Evaluating Quality and Comprehension of Real-Time Sign Language Video on Mobile Phones

  Jessica J. Tran, Joy Kim, Jaehong Chon, Eve A. Riskin, Richard E. Ladner, Jacob O. Wobbrock · 2011 · Proceedings of the 13th International ACM SIGACCESS Conference on Computers and Accessibility (ASSETS 2011)

  This paper investigates the relationship between objective video quality metrics (PSNR — peak signal-to-noise ratio), subjective quality preferences, and actual comprehension of American Sign Language (ASL) video transmitted at very low bitrates on mobile phones. At the time of…

  deaf · American Sign Language · video compression · mobile accessibility · video quality

• Multiple View Perspectives: Improving Inclusiveness and Video Compression in Mainstream Classroom Recordings

  Raja S. Kushalnagar, Anna C. Cavender, Jehan-François Pâris · 2010 · Proceedings of the 12th International ACM SIGACCESS Conference on Computers and Accessibility (ASSETS 2010)

  This paper presents Multiple View Perspectives (MVP), a system that captures and presents multiple focused video views of a classroom for deaf and hard of hearing (DHH) students. DHH students in mainstream classrooms face a fundamental visual attention problem: they must…

  deaf and hard of hearing · lecture capture · video accessibility · classroom accessibility · sign language interpreting

• A Web-Based User Survey for Evaluating Power Saving Strategies for Deaf Users of MobileASL

  Jessica J. Tran, Tressa W. Johnson, Joy Kim, Rafael Rodriguez, Sheri Yin, Eve A. Riskin, Richard E. Ladner, Jacob O. Wobbrock · 2010 · Proceedings of the 12th International ACM SIGACCESS Conference on Computers and Accessibility (ASSETS 2010)

  This paper presents research on power-saving video compression algorithms for MobileASL, a project enabling real-time, two-way video communication on mobile phones so Deaf people can communicate in American Sign Language. Running video calls drains phone batteries rapidly — only…

  deaf and hard of hearing · sign language · American Sign Language · mobile technology · video compression

• Variable frame rate for low power mobile sign language communication

  Neva Cherniavsky, Anna C. Cavender, Richard E. Ladner, Eve A. Riskin · 2007 · Proceedings of the 9th International ACM SIGACCESS Conference on Computers and Accessibility (ASSETS '07)

  This paper from the University of Washington MobileASL team — Neva Cherniavsky, Anna Cavender, Richard Ladner, and Eve Riskin — addresses a then-emerging problem: enabling Deaf people in the United States to hold real-time American Sign Language conversations over the cellular…

  American Sign Language · sign language · fingerspelling · Deaf community · video phone

• MobileASL: Intelligibility of Sign Language Video as Constrained by Mobile Phone Technology

  Anna Cavender, Richard E. Ladner, Eve A. Riskin · 2006 · Proceedings of the 8th International ACM SIGACCESS Conference on Computers and Accessibility (Assets '06)

  This paper presents MobileASL, a video compression research project aimed at enabling Deaf people to communicate in American Sign Language (ASL) over mobile phone networks. In 2006, Deaf people in the US were limited to text messaging on mobile phones, forcing communication in…

  deaf · American Sign Language · mobile phone · video compression · video relay

• Dual Level Intraframe Coding for Increased Video Telecommunication Bandwidth

  David M. Saxe, Richard A. Foulds, Arthur W. Joyce · 1998 · Proceedings of the Third International ACM Conference on Assistive Technologies (Assets '98)

  This paper from the Applied Science and Engineering Laboratories at the University of Delaware presents a dual-level video compression approach designed to make sign language transmission viable over bandwidth-limited telephone networks. The authors identify a fundamental…

  sign language · deafness · video conferencing · video compression · telecommunications

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