The effects of digital video quality on learner comprehension in an american sign language assessment environment
Date
2007Author
Hooper, Simon
Miller, Charles
Rose, Susan
Veletsianos, George
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Show full item recordAbstract
The effects of digital video framerate and size on American Sign Language (ASL) learner
comprehension were investigated. Fifty-one students were randomly assigned to one of three
video size treatment groups: 480x360, 320x240, and 240x180 pixels. Within each treatment,
students were presented three 30-second videos of signed narratives at framerates of 6, 12, and
18 frames per second. Participants used ASL to retell each story and performances were captured
by a digital video camera and archived for evaluation. Three ASL experts evaluated the video
performances and generated a fluency score for each student. The results indicate that framerate
and the interaction between framerate and ASL level had significant effects on learner
comprehension, but video size did not significantly affect learner comprehension. These results
are used to generate framerate and video-size recommendations for displaying and recording
student performance and instructor feedback videos in an ASL performance assessment software
environment.
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