適用於場景切換之強健型H.264/AVC位元率控制

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姓名

詹晨鋒(Chen-feng Chan) 查詢紙本館藏

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通訊工程學系在職專班

論文名稱

適用於場景切換之強健型H.264/AVC位元率控制
(Robust Rate Control Mechanism against Scene Change for H.264/AVC)

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摘要(中)

網路有限的頻寛下，為使解碼端能得到好的編碼影像品質，位元率控制機制扮演重要角色。H.264/AVC參考編碼器JM中的位元率控制主要依JVT-G012文件提案進行實作。JVT-G012位元率控制演算法並未對場景切換進行處理，當遇到場景切換時會造成編碼位元數量大增，此時緩衝區容易滿溢，後續FRAME可用位元數急速下降，造成整體編碼品質下降。本論文利用連續兩張畫面間16x16模式運動估計求得之SAD (Sum of Absolute Differences)比值以進行場景切換之偵測。當偵測到是場景切換畫面後，我們將目前GOP (Group of Pictures)剩餘的畫面當作新的GOP並提出依畫面複雜度和緩衝區狀態的場景切換適合之量化參數。
實驗結果指出，與JM17.2版本模擬比較，我們所提出的方法平均PSNR能提高大約1.07dB並使用較少的緩衝區。

摘要(英)

Under the constraint of limited channel rates, the decoder client might get better video quality by using rate control. The rate control of H.264/AVC reference software JM is implemented according to the technical document JVT-G012. However, the method in JVT-G012 does not particularly deal with scene changes, resulting in coded bits significantly increased. This situation can cause the buffer overflow and even influence the quality of remaining frames. In this thesis, we first propose a scene change detection method by utilizing the SAD ratio of consecutive two frames after performing 16x16 motion estimation. After scene change is detected, we regard the remaining frames in current GOP as a transition GOP and propose a suitable quantization parameter to the first I-frame in transition GOP based on frame complexity and buffer fullness status.
Compared with the method in JM17.2, the proposed method can improve average PSNR by 1.07 dB with less buffer size.

關鍵字(中)

★ 量化參數
★ 場景切換偵測
★ 視訊編碼
★ H.264

關鍵字(英)

★ Quantization Parameter
★ Scene Change Detection
★ Video Coding
★ H.264

論文目次

摘要 ...................................................................................................... I
ABSTRACT ............................................................................................ II
誌謝 .................................................................................................... IV
目錄 ..................................................................................................... V
表目錄 ................................................................................................ VI
圖目錄 ............................................................................................... VII
第一章緒論 ........................................................................................ 1
1.1簡介 ...................................................................................................... 1
1.2研究動機 .............................................................................................. 1
1.3 研究目的 ............................................................................................. 2
1.4 論文架構 ............................................................................................. 2
第二章 H.264 編碼基本介紹與位元率控制 ....................................... 3
2.1 H.264發展歷程與編碼簡介 ................................................................ 3
2.2 H.264 位元率控制 ............................................................................... 8
第三章場景切換位元控制之探討與相關研究 ................................. 18
3.1場景切換對H.264位元率控制影響 ................................................ 18
3.2場景切換之偵測方法 ........................................................................ 26
3.3場景切換後位元率的控制 ................................................................ 30
第四章在場景切換狀態下改善H.264位元率控制 .......................... 36
4.1提出之場景切換偵測方法 ................................................................ 36
4.2提出之位元率控制方法 .................................................................... 40
第五章模擬實驗結果與討論 ........................................................... 54
5.1實驗參數與模擬環境 ........................................................................ 54
5.2適用於場景切換之強健型H.264/AVC位元率控制的結果分析和討
論 ............................................................................................................... 55
第六章結論 ....................................................................................... 69
參考文獻 ........................................................................................... 71

參考文獻

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指導教授

張寶基(Pao-chi Chang)

審核日期

2012-7-24

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