MPEG-2到H.264畫面間轉換編碼之研究

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姓名

蘇詮智(Cyuan-Jhih Su) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

MPEG-2到H.264畫面間轉換編碼之研究
(Study of MPEG2 to H.264 inter frame transcoding)

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摘要(中)

目前有許多的影像資料都是採用MPEG-2標準去儲存和傳送，像是DVD和DTV等不同方面的應用，而H.264是目前最新的視訊壓縮標準之一，它適合較低頻寬的網路傳送，與MPEG-2相比，也能達到較佳的編碼效率，既然過去的檔案資料是不能捨棄的，從MPEG-2到H.264的轉換編碼系統就變的十分重要，我們試圖去發展一個轉換編碼系統，它可以降低計算複雜度又不會造成影像品質的大量衰退。
轉換編碼系統最主要的問題，在於如何在編碼端將解碼端獲取的資訊做再利用並避免多餘的編碼程序計算，這篇論文裡面所討論的是畫面間轉換編碼，而畫面間轉換編碼包含了畫面內和畫面間的模式預測，在畫面間模式預測中，我們先擷取解碼端的資訊，將MPEG-2的影像區塊作分類，再利用零區塊偵測和快速移動估計的演算法去加速整個轉換編碼系統；在畫面內模式預測則是利用零區塊偵測和絕對誤差轉換和演算法去做加速，最後我們將這兩部分的演算法合併，提出一個整合型的快速畫面間轉換編碼演算法，實驗的模擬數據顯示，我們的演算法能大幅的縮短編碼時間，而且該演算法在影像品質上所造成的衰減也是可以忽略的。

摘要(英)

There are many videos sources recorded and transmitted in the MPEG-2 format for DVD and DTV applications. H.264 is one of the latest video compression standards, and suitable for low-bandwidth networks such as wireless network. It can achieve better coding efficiency than MPEG-2. Since we can’t abandon the files recorded in MPEG-2 format, transcoding system from MPEG-2 to H.264 has become very important. We should develop a transcoding system which can reduce the computation complexity without reducing video quality extensively.
The key problem to speed the transcoding system is how to reuse the decoded information into encoding process to avoid redundant encode computation. We will discuss the inter frame transcoding here. Inter frame transcoding includes intra mode prediction and inter mode prediction. In inter mode prediction, we retrieve decoded information in MPEG-2 and classify them into different type. Then we use ZBD detection and FME algorithm to speed up the transcoding system. In intra frame prediction, we use ZBD and SATD-based to speed up the transcoding system. In the end, we combine the two system into a conformable transcoding system. According to the simulation results, the proposed algorithm can reduced the computation time extensively. The degradation in video quality caused by proposed algorithm is negligible.

關鍵字(中)

★ H.264
★ 畫面間
★ 轉換編碼
★ MPEG-2

關鍵字(英)

★ Inter frame
★ H.264
★ MPEG-2
★ Transcoding

論文目次

第一章緒論..................................1
1.1 視訊壓縮標準簡介........................1
1.2 動機與目的..............................1
1.3 論文架構................................2
第二章轉換編碼系統..........................3
2.1 轉換編碼(Transcoding)系統簡介................3
2.2 MPEG-2和H.264視訊編碼系統簡介...............5
2.2.1 編碼的預測模式.............................5
2.1.2參考畫面的數目.............................10
2.2.3 影像解析度................................11
2.2.4 離散餘弦轉換(DCT)與量化(Quantization)過程.12
2.2.5 其他特性與總結............................15
第三章快速畫面內(Intra frame)預測轉換編碼演算法簡介.17
3.1 MPEG-2畫面內預測資訊擷取.............................17
3.2 基於絕對誤差轉換和(SATD-based)之快速畫面內預測演算法.18
3.3基於低頻交流值( )之快速畫面內預測轉換編碼演算法.......20
3.3.1 演算法流程.........................................20
3.3.2 效能分析...........................................22
3.4加強型快速畫面內預測轉換編碼演算法....................25
3.4.1 演算法流程.........................................25
3.4.2 效能分析...........................................25
第四章快速畫面間(Inter frame)預測轉換編碼演算法研究.28
4.1 MPEG-2畫面間預測資訊擷取............................28
4.2 畫面間預測轉換編碼演算法之回顧......................30
4.2.1 畫面間預測轉換編碼演算法之回顧....................31
4.2.2 MPEG-2與H.264編碼模式的統計分析...................33
4.3 快速畫面間模式(Inter mode)預測演算法探討............36
4.3.1 基於零區塊預測之畫面間模式預測演算法..............36
a) 零區塊演算法的回顧...................................36
b) 零區塊演算法的統計分析與模式決策.....................38
c) 效能分析.............................................43
4.3.2 移動向量之再利用..................................44
a) 於零區塊偵測演算法之再利用...........................44
b) 於移動搜尋之再利用...................................46
c) 效能分析.............................................50
4.4 快速畫面內模式(Intra mode)預測演算法探討............54
4.4.1 演算法流程........................................54
4.4.2 效能比較..........................................55
4.5 整合型快速畫面間預測轉換編碼演算法..................55
4.5.1 演算法流程........................................57
4.5.2 效能比較..........................................58
4.6 結論................................................61
第五章結論及未來展望..................................62
參考文獻……………………………………………………………………...63

參考文獻

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[15] MPEG-2 Encoder/Decoder, Ver1.2, July1996
ftp://ftp.mpeg.org/pub/mpeg/mssg/
[16] H.264 Encoder/Decoder, Ver12.2,
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[18] Jun Xin, Jianjun Li, Anthony Vetro and Shun-ichi Sekiguchi, “Motion Mapping and Mode Decision for MPEG-2 to H.264/AVC Transcoding” Multimedia Tools and Applications. Appl (2007).
[19] Yu-Ming Lee and Yinyi Lin, “An Improved Zero-Block Mode Decision Alrorithm for H.264/AVC.” ICIP 2007
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指導教授

林銀議(Yin-Yi Lin)

審核日期

2008-7-11

推文