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研究生:邱垂益
研究生(外文):Chui-Yi Chiu
論文名稱:根據網路頻寬動態調整MPEG-4視訊流
論文名稱(外文):Dynamically Adjusting MPEG4 Video Streams Based on Network Bandwidth
指導教授:黃胤傅
指導教授(外文):Yin-Fu Huang
學位類別:碩士
校院名稱:國立雲林科技大學
系所名稱:電子與資訊工程研究所碩士班
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2004
畢業學年度:92
語文別:中文
論文頁數:60
中文關鍵詞:視訊隨選系統升(降)級視訊流MPEG-4標準動態調整頻寬演算法
外文關鍵詞:MPEG-4video on demandbandwidthobject match algorithmstreamingdynamically adjusting algorithmthresholddegradeupgradeQoS
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隨選視訊無疑是下一代最熱門的視訊產業,而為了有效利用最少的資源與傳輸頻寬,卻能達到最多同時服務使用者的要求一直是我們努力的目標。在此,我們引用了最新多媒體標準MPEG-4的概念,對物件做適當處理。首先預定現實網路頻寬是有限的,當使用者達到上線邊緣時,我們藉由所演譯的動態調整頻寬演算法,去利用一些影像處理的技術對物件做處理、且評估物件在此視訊流中的重要性決定是否傳送,如此便可節省頻寬達到增加使用者的目的。我們將影片依評估所得之臨界值分為4個等級,每當有新使用者要求服務時,視頻寬的剩餘來決定因應策略,如有剩餘便直接分配頻寬給其使用,若有不足便降級已存在使用者的服務品質,所得頻寬給予新使用者使用,直至所有使用者皆已降級至可接受之最低服務品質時,便已達到此系統使用者之最大上限。
The video on demand system certainly is the popular industry in the next generation. Our goal that employs the less resources and bandwidth effectively is to achieve the most users at the same time. After having the overview of the system and analysis the threshold value explicitly, we hope to develop an algorithm that can greatly improve the performance in the system.
Here we reference a concept of MPEG-4 standard that is the newest standard in multimedia to process objects appropriately. First, we assumed the bandwidth is finite. When the number of user is achieving the upper-bound of the system, we follow our Dynamic Allocate Scheme that employs some image processing technology to process objects. Furthermore estimating the importance of object in the stream and deciding whether the object is send. This can save bandwidth that increases users to achieve our goal. We classify four service levels based on the estimated threshold value. Running our scheme according to the remaining bandwidth whenever a new user is to request service. If the system has enough bandwidth, we allocate to users directly. Otherwise we degrade the existed users to save bandwidth up to can service the new user or all users in the system are serviced a lowest QoS. This is the maximum user of the system.
目 錄

目錄 …………………………………………………………………………v
表目錄 ………………………………………………………………………...vi
圖目錄 ………………………………………………………………………..vii
一、 緒論……………………………………………………………………1
二、 系統模型………………………………………………………………3
2.1 假設條件………………………………………………………………3
2.2 檔案分類與臨界值之分析……………………………………………4
2.3 問題定義………………………………………………………………5
三、 針對頻寬的調整策略…………………………………………………6
3.1 檔案格式………………………………………………………………6
3.2 臨界值的分析和物件比對演算法……………………………………7
3.2.1 臨界值的分析…………………………………………………………7
3.2.2 物件比對演算法………………………………………………………9
3.3 動態調整頻寬演算法……………………………………………..…10
四、 效能評估……………………………………………………………..16
4.1 實驗模型……………………………………………………………..16
4.2 模擬實驗參數………………………………………………………..17
4.2.1 不同檔案特性分析…………………………………………………..17
4.2.2 系統整體效能分析…………………………………………………..17
4.3 實驗與分析…………………………………………………………..18
五、 結論與未來工作……………………………………………………..24
參考文獻…………………………………………………………………………….25
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[3]Shao-Yi Chien, Shyh-Yih Ma, and Liang-Gee Chen, “Efficient moving object segmentation algorithm using background registration technique,” IEEE Trans. Circuits and System for Video Technology, Vol. 12, No. 7, 2002, pp. 577-586.
[4]Hideaki Goto and Hirotomo Aso, “Character pattern extraction based on local multilevel thresholding and region growing,” Proc. 15th IEEE International Conference on Pattern Recognition, 2000, pp. 430-433.
[5]Sangjoong Kim, Yonggil Kim, Kangbin Yim, Hwaja Chung, Kyunghee Choi, Yongdeak Kim, and Gihyun Jung, “A fast motion estimator for real-time system,” IEEE Trans. Consumer Electronics, Vol. 43, No. 1, 1997, pp. 24-33.
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[8]Furini Marco and Donald F. Towsley, “Real-time traffic transmissions over the internet,” IEEE Trans. Multimedia, Vol. 3, No. 1, 2001, pp. 33-40.
[9]Michael Merz, Konrad Froitzheim, Peter Schulthess, and Heiner Wolf, “Iterative transmission of media streams,” Proc. 5th ACM International Conference on Multimedia, 1997, pp. 283-290.
[10]MPEG Video Group, “MPEG-4 video verification model - version 2.1,” ISO/IEC JTC1/SC29/WG11, 1996.
[11]T. Sikora, “The MPEG-4 video standard verification model,” IEEE Trans. Circuits and System for Video Technology, Vol. 7, No. 1, 1997, pp. 19-31.
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