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姓名 許文川(Wen-Chuan Hsu) 查詢紙本館藏 畢業系所 通訊工程學系在職專班 論文名稱 H.264 可調適多幅參考畫面移動補償
(Adaptive Multiple Reference Frames Motion Compensation in H.264/AVC)相關論文 檔案 [Endnote RIS 格式]
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摘要(中) 新一代的H.264 不管是壓縮率和影像品質都明顯優於以往的視訊標準。這是因為其使用了新的技術可變區塊大小的移動估計、多幅參考畫面的移動估計、整數轉換。
H.264運用了多幅參考畫面移動估計的技術,這技術讓H.264 編碼效益提升許多,但同時也增加了龐大的運算複雜度,我們提出一種演算法基於連續畫面間的相關性以改進多幅參考畫面移動估計之編碼效率。
在本章中,我們修改了幾個先前的演算法,並提出了一種可調適機制,可以利用移動特性來改善先前的作法。在提出的演算法中,我們使用一個簡單的標準分類所有的巨區塊特徵 (穩定區域或非穩定區 域)。
實驗結果顯示,建議的演算法對多幅參考畫面全搜索演算法的比較可以顯著減少計算複雜度,同時保持了良好的編碼性能。
摘要(英) The new video coding standard, H.264/AVC, uses variable block size ranging from 4x4 to 16x16 and multi-reference frame in interframe coding。
We proposed an effective algorithm to improve the multiple reference frame motion estimation scheme in H.264,based upon correlation among successive frames and neighboring blocks。 To improve coding efficiency, in this paper, we modify the previous algorithm and propose an adaptive mechanism, which makes use of motion characteristic to modify previous work。In proposed algorithm, we make use of a simple criterion to distinguish
the macroblock characteristic(stationary region or non-stationary region)。
The experimental results reveal that the proposed algorithm brings out a significant reduction in computation compared to the multiple reference frame
full search algorithm, while maintaining a good coding performance。
關鍵字(中) ★ 多幅參考畫面
★ H.264
★ 單調遞增
★ 選擇性多幅參考畫面移動估計
★ 全零區塊
★ 提前終斷
★ 區域基礎關鍵字(英) ★ H.264
★ multiple reference frames
★ selective multip論文目次 論文摘要.............................................................................................................II
Abstract ............................................................................................................. III
第一章 緒論....................................................................................................... 1
1.1 國際視訊壓縮標準簡介.............................................................. 1
1.2 動機與目地.................................................................................. 4
1.3 論文架構...................................................................................... 5
第二章 多幅參考畫面及提前終斷演算法回顧............................................ 7
2.1 多幅參考畫面移動估計演算法.................................................. 9
2.2 選擇性多幅參考畫面移動估計演算法.................................... 11
2.3 區域基礎演算法........................................................................ 14
2.4 全零區塊演算法........................................................................ 16
2.5 單調演算法................................................................................ 18
2.6 效能分析.................................................................................... 18
2.6.1 環境相關設定..................................................................... 18
2.6.2 統計分析............................................................................. 20
2.7 結論............................................................................................ 25
第三章 不同演算法下的固定參數分析......................................................... 26
3.1 選擇性多幅參考畫面對於不同factor 的影響......................... 27
3.1.1 固定量化參數下的不同factor 編碼效能分析.................. 28
3.1.2 不同量化參數下的不同factor 編碼效能分析.................. 30
3.2 區域基礎對於不同搜索區域大小的影響................................ 34
3.2.1 固定量化參數下的不同搜索區域大小編碼效能分析..... 35
3.2.2 不同量化參數下的不同搜索區域大小編碼效能分析..... 36
3.3 全零區塊對於不同臨界值的影響............................................ 40
3.3.1 固定量化參數下的不同臨界值編碼效能分析................. 40
3.3.2 不同量化參數下的不同臨界值編碼效能分析................. 41
3.4 單調遞增對於提前偵測的影響................................................ 45
3.4.1 固定量化參數下的提前偵測編碼效能分析..................... 45
3.4.2 不同量化參數下的提前偵測編碼效能分析..................... 47
第四章 可調適多幅參考畫面移動估計......................................................... 51
4.1 可調適選擇性多幅參考畫面移動估計.................................... 54
4.2 可調適區域基礎演算法............................................................ 58
4.3 可調適全零區塊演算法............................................................ 62
4.4 可調適單調遞增演算法............................................................ 66
4.5 合併可調適演算法效能分析.................................................... 70
4.6 效能分析.................................................................................... 70
4.6.1 環境參數設定..................................................................... 70
4.6.2 固定量化參數下之編碼效能比較..................................... 70
4.6.3 不同量化參數下之編碼效能比較..................................... 73
第五章 結論及未來展望................................................................................. 77
參考文獻........................................................................................................... 78
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