Dynamic Frame Rate Control in Video Transcoding for Multipoint Video Conferencing
碩士 === 國立清華大學 === 電機工程學系 === 88 === Video conference is an Internet application which provides an environment for people to see and talk to other persons who are far away. A video transcoder is required in a multipoint video conference to convert input streams into different format, espec...
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ndltd-TW-088NTHU04420322016-07-08T04:23:17Z http://ndltd.ncl.edu.tw/handle/29195596208006916607 Dynamic Frame Rate Control in Video Transcoding for Multipoint Video Conferencing 應用於多點視訊會議系統中視訊轉換編碼之畫框率之動態調整 Wei-Hao Liao 廖偉豪 碩士 國立清華大學 電機工程學系 88 Video conference is an Internet application which provides an environment for people to see and talk to other persons who are far away. A video transcoder is required in a multipoint video conference to convert input streams into different format, especially different bit-rate. Ordinary transcoder degrades temporal quality by setting a fixed frame-rate, but the requirement of motion smoothness changes with video properties. It’s necessary to adjust the frame-rate to a proper value to achieve better spatial and temporal quality. We propose a dynamic frame rate control scheme to adjust frame-rate to fit the property of video. By using frame-rate and motion level of object as measurement of temporal quality, spatial and temporal quality can be considered at the same time. When bit-rate decreases, frame-rate will be decreased to improve frame quality. When motion level increases, frame-rate will be increased to provide better continuity. Since the adaptive control method is used and all parameters are extracted from original transcoder processing, our proposed scheme is suitable for real-time applications. Yung-Chang Chen 陳永昌 2000 學位論文 ; thesis 46 en_US |
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碩士 === 國立清華大學 === 電機工程學系 === 88 === Video conference is an Internet application which provides an environment for people to see and talk to other persons who are far away.
A video transcoder is required in a multipoint video conference to convert input streams into different format, especially different bit-rate. Ordinary transcoder degrades temporal quality by setting a fixed frame-rate, but the requirement of motion smoothness changes with video properties. It’s necessary to adjust the frame-rate to a proper value to achieve better spatial and temporal quality.
We propose a dynamic frame rate control scheme to adjust frame-rate to fit the property of video. By using frame-rate and motion level of object as measurement of temporal quality, spatial and temporal quality can be considered at the same time. When bit-rate decreases, frame-rate will be decreased to improve frame quality. When motion level increases, frame-rate will be increased to provide better continuity.
Since the adaptive control method is used and all parameters are extracted from original transcoder processing, our proposed scheme is suitable for real-time applications.
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author2 |
Yung-Chang Chen |
author_facet |
Yung-Chang Chen Wei-Hao Liao 廖偉豪 |
author |
Wei-Hao Liao 廖偉豪 |
spellingShingle |
Wei-Hao Liao 廖偉豪 Dynamic Frame Rate Control in Video Transcoding for Multipoint Video Conferencing |
author_sort |
Wei-Hao Liao |
title |
Dynamic Frame Rate Control in Video Transcoding for Multipoint Video Conferencing |
title_short |
Dynamic Frame Rate Control in Video Transcoding for Multipoint Video Conferencing |
title_full |
Dynamic Frame Rate Control in Video Transcoding for Multipoint Video Conferencing |
title_fullStr |
Dynamic Frame Rate Control in Video Transcoding for Multipoint Video Conferencing |
title_full_unstemmed |
Dynamic Frame Rate Control in Video Transcoding for Multipoint Video Conferencing |
title_sort |
dynamic frame rate control in video transcoding for multipoint video conferencing |
publishDate |
2000 |
url |
http://ndltd.ncl.edu.tw/handle/29195596208006916607 |
work_keys_str_mv |
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