<p>Communication tools such as text-based instant messaging, voice and video relay services, real-time video chat and mobile SMS and MMS have successfully been used among Deaf people. Several years of field research with a local Deaf community revealed that disadvantaged South African Deaf  / people preferred to communicate with both Deaf and hearing peers in South African Sign Language as opposed to text. Synchronous video chat and video  / relay services provided such opportunities. Both types of services are commonly available in developed regions, but not in developing countries like South  / Africa. This thesis reports on a workaround approach to design and develop an asynchronous video communication tool that adapted synchronous video  /   / codecs to store-and-forward video delivery. This novel asynchronous video tool provided high quality South African Sign Language video chat at the  / expense of some additional latency. Synchronous video codec adaptation consisted of comparing codecs, and choosing one to optimise in order to  / minimise latency and preserve video quality. Traditional quality of service metrics only addressed real-time video quality and related services. There was no  / uch standard for asynchronous video communication. Therefore, we also enhanced traditional objective video quality metrics with subjective  / assessment metrics conducted with the local Deaf community.</p>
| Identifer | oai:union.ndltd.org:UNWC/oai:UWC_ETD:http%3A%2F%2Fetd.uwc.ac.za%2Findex.php%3Fmodule%3Detd%26action%3Dviewtitle%26id%3Dgen8Srv25Nme4_2950_1370593938 |
| Date | January 2009 |
| Creators | Ma, Zhenyu |
| Source Sets | Univ. of Western Cape |
| Language | English |
| Detected Language | English |
| Type | Thesis and dissertation |
| Format | |
| Coverage | ZA |
| Rights | Copyright: University of the Western Cape |
Page generated in 0.0025 seconds