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研究生: 康文俊
論文名稱: 視訊串流傳輸的適應性JSCC模組
An Adaptive JSCC Model for Video Streaming Transmission
指導教授: 許奮輝
口試委員:
學位類別: 碩士
Master
系所名稱: 電機資訊學院 - 資訊工程學系
Computer Science
論文出版年: 2004
畢業學年度: 92
語文別: 中文
論文頁數: 44
中文關鍵詞: 資料傳輸結合編碼畫框集合錯誤回復編碼頁框參照突波性遺失暴力法
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  • 對於視訊串流傳輸越來越被渴望的情況下,許多的問題也浮現出來,同時有許多的方法被提出來解決這樣的問題。JSCC(Joint Source / Channel Coding)的概念,被廣泛的研究著。在這篇論文裡我們由龐大的實驗數據分析及長期研究這個問題的經驗,推論出一個相當簡潔的JSCC解決方法,對於任何頁框參照(frame-dependence)的壓縮影片,在任一網路情況均可立即求得一組JSCC的參數,包括GOP結構,頁框速率(frame rate),預先錯誤修正碼(FEC)的配置,此外我們的JSCC模組考慮到實用上的真實環境,引入了可適用於相異場景的頁框大小模組(frame size model),這是壓縮影像轉碼(source transcoding)常被忽略的。最後的模擬實驗都顯示出我們的JSCC模組可以適用於場景特性相異的數種影片,不論在一定範圍的封包遺失率下,或是不同的流量限制條件裡,我們的JSCC模組都可以達到相當接近於由全域最佳搜尋(brute-force search)的效能,甚至在包含變動封包遺失長度(burst loss length)的模擬環境裡,測試結果顯示我們方法的效能超越了全域最佳預測搜尋的結果,更重要的是,我們JSCC的時間複雜度遠低於全域最佳預測搜尋所耗費的時間成本。因此,對於在具有封包遺失特性的網路環境下,透過我們的JSCC模組的處理後可以讓使用者端得到較佳的畫框速率。


    摘 要 誌 謝 第1章 簡 介 1 第2章 相關研究及問題概述 5 第3章 頁框大小模組 8 3.1 P-FRAME SIZE的統計及逼近模組 10 3.2 B-FRAME SIZE的統計及逼近模組 12 3.3 頁框大小模組推導 14 第4章 特性分析及方法推論 16 4.1 模擬環境設定 16 4.2 分析數據 18 4.2.1 平均頁框大小對於FPS效能的影響 19 4.2.2 發送端FPS對於接收端FPS效能的影響 20 4.2.3 FEC ratio 對於FPS效能的影響 21 4.3 方法推論 23 第5章 我們的JSCC方法模組 24 5.1 SC及CC的頻寬分配 25 5.2 SC的參數決定 25 5.2.1 平均頁框大小最小的GOP結構 25 5.2.1.1 參數 及 的設定 26 5.2.1.2 參數n的決定 26 5.2.2 發送端FPS的決定 27 5.3 CC的FEC REDUNDANCY分配 27 第6章 實驗模擬及效能評論 30 6.1 模擬環境設定 31 6.1.1 測試影片樣本及網路流量限制 31 6.1.2 封包遺失事件(Loss events) 33 6.2 效能探討 34 6.2.1 在不同流量限制下的效能比較 34 6.2.2 在Burst packet loss環境的效能比較 36 6.2.3 頁框大小模組的影響 39 第7章 缺點及問題討論 42 第8章 結 論 44 附錄一 參考文獻 A

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