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研究生： 方延能
Yan-Neng Fang
論文名稱： H.264/AVC中B畫面直接模式編碼之研究
Direct Mode Coding for B Slice in H.264/AVC
指導教授： 林銀議
Yinyi Lin
口試委員:
學位類別： 碩士
Master
系所名稱： 資訊電機學院 - 通訊工程學系
Department of Communication Engineering
畢業學年度： 99
語文別： 中文
論文頁數： 68
中文關鍵詞： B畫面 、時間域直接模式 、直接模式
外文關鍵詞： Temporal Direct, Direct Mode, B Slice, H.264
相關次數： 點閱：8  下載：0 
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    • 比起先前的視訊壓縮技術，如MPEG-2以及H.263，H.264/AVC有著更好的編碼效率，這是因為有許多先進的技術被應用在裡面，B畫面中的直接模式就是其中一種，當最佳模式被決策為直接模式時，我們就可以得到較低的位元率。在H.264/AVC中，時間域直接模式利用後一張P畫面中相同位置巨區塊的資訊來取得直接模式移動向量，但是這種方式並未考慮到所有的移動情形，因此除了考慮後一張P畫面中相同位置巨區塊的知訊之外，在本篇論文中，我們將它鄰近巨區塊的資訊也列入考慮，藉此已達成改良直接模式的目的。在本篇論文的最後，實驗結果也顯示出我們所提出的方法可以比原始的方法帶來大約平均3.3%的位元率增益。

    H.264/AVC achieves better coding efficiency than previous coding standard, such as MPEG-2 and H.263. This is because that many advanced techniques are employed. One of important technique is direct mode coding. The encoded bit rate can be saved when the direct mode is chosen as best mode. In H.264/AVC, temporal direct mode only uses the co-located information of previous coded P picture. However the motion in video sequence is not still. In addition to the co-located information, in this thesis we make use of the neighboring information to improve the direct mode coding. The experimental results show that our proposed algorithm can achieve 3.3% of BD bit-rate decrement on average when compared to original algorithm.

    第一章 緒論 1.1 研究動機與簡介 1 1.2 論文架構 2 第二章 H.264中B畫面及直接模式之介紹 2.1 B畫面之介紹 3 2.2 直接模式之介紹 6 2.2.1 時間域直接模式以及空間域直接模式之介紹 8 2.2.2 基於時間域直接模式之移動向量插值演算法 10 第三章 直接模式中的移動向量估測之研究 3.1 移動向量估測演算法之介紹 14 3.2 額外檔頭資訊 21 3.3 效能分析與討論 25 第四章 改良型移動向量估測演算法 4.1 絕對預測誤差和 36 4.2 效能分析 4.2.1 應用在不同區塊組合之效能比較 41 4.2.2 改良型移動向量估測演算法之效能分析 45 第五章 結論 64 參考文獻 66

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