TY - GEN
T1 - A web-based user survey for evaluating power saving strategies for deaf users of MobileASL
AU - Tran, Jessica J.
AU - Johnson, Tressa W.
AU - Kim, Joy
AU - Rodriguez, R.
AU - Yin, Sheri
AU - Riskin, Eve A.
AU - Ladner, Richard E.
AU - Wobbrock, Jacob O.
PY - 2010
Y1 - 2010
N2 - MobileASL is a video compression project for two-way, real-time video communication on cell phones, allowing Deaf people to communicate in the language most accessible to them, American Sign Language. Unfortunately, running MobileASL quickly depletes a full battery charge in a few hours. Previous work on MobileASL investigated a method called variable frame rate (VFR) to increase the battery duration. We expand on this previous work by creating two new power saving algorithms, variable spatial resolution (VSR), and the application of both VFR and VSR. These algorithms extend the battery life by altering the temporal and/or spatial resolutions of video transmitted on MobileASL. We found that implementing only VFR extended the battery life from 284 minutes to 307 minutes; implementing only VSR extended the battery life to 306 minutes, and implementing both VFR and VSR extended the battery life to 315 minutes. We evaluated all three algorithms by creating a linguistically accessible online survey to investigate Deaf people's perceptions of video quality when these algorithms were applied. In our survey results, we found that VFR produces perceived video choppiness and VSR produces perceived video blurriness; however, a surprising finding was that when both VFR and VSR are used together, they largely ameliorate the choppiness and blurriness perceived, i.e., they each improve the use of the other. This is a useful finding because using VFR and VSR together saves the most battery life.
AB - MobileASL is a video compression project for two-way, real-time video communication on cell phones, allowing Deaf people to communicate in the language most accessible to them, American Sign Language. Unfortunately, running MobileASL quickly depletes a full battery charge in a few hours. Previous work on MobileASL investigated a method called variable frame rate (VFR) to increase the battery duration. We expand on this previous work by creating two new power saving algorithms, variable spatial resolution (VSR), and the application of both VFR and VSR. These algorithms extend the battery life by altering the temporal and/or spatial resolutions of video transmitted on MobileASL. We found that implementing only VFR extended the battery life from 284 minutes to 307 minutes; implementing only VSR extended the battery life to 306 minutes, and implementing both VFR and VSR extended the battery life to 315 minutes. We evaluated all three algorithms by creating a linguistically accessible online survey to investigate Deaf people's perceptions of video quality when these algorithms were applied. In our survey results, we found that VFR produces perceived video choppiness and VSR produces perceived video blurriness; however, a surprising finding was that when both VFR and VSR are used together, they largely ameliorate the choppiness and blurriness perceived, i.e., they each improve the use of the other. This is a useful finding because using VFR and VSR together saves the most battery life.
KW - American Sign Language
KW - Battery power consumption
KW - Deaf community
KW - Deaf culture
KW - Encoding algorithms
KW - Mobile phones
KW - Video compression
KW - Web-based user survey
UR - http://www.scopus.com/inward/record.url?scp=78650593979&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=78650593979&partnerID=8YFLogxK
U2 - 10.1145/1878803.1878825
DO - 10.1145/1878803.1878825
M3 - Conference contribution
AN - SCOPUS:78650593979
SN - 9781605588810
T3 - ASSETS'10 - Proceedings of the 12th International ACM SIGACCESS Conference on Computers and Accessibility
SP - 115
EP - 122
BT - ASSETS'10 - Proceedings of the 12th International ACM SIGACCESS Conference on Computers and Accessibility
T2 - 12th International ACM SIGACCESS Conference on Computers and Accessibility, ASSETS'10
Y2 - 25 October 2010 through 27 October 2010
ER -