HEVC低位元率視訊編碼之研究

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姓名

張惟焜(Wei-kun Chang) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

HEVC低位元率視訊編碼之研究
(Low Bitrate Video Coding for HEVC)

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摘要(中)

近年來，愈來愈多裝載高解析度裝置諸如智慧型手機、平板電腦及數位相機等，伴隨高解析度而來的是龐大的資料量，所以視訊壓縮技術儼然成為一門重要的課題。目前最新的視訊壓縮技術HEVC(High Efficiency Video Coding)，雖然比起以往的H.264/AVC有更好的壓縮率，但其編碼複雜度也增加許多。本論文為了降低編碼運算複雜度，所以提出簡單型零區塊模式決策演算法(Simple Zero Block Mode Decision, S_ZBMD)，利用零區塊的分佈特性，來選擇合適區塊大小及預測模式，以提前終止CU遞迴的切割來達到節省編碼時間之目的。為了提升HEVC標準架構的編碼效益，利用改良型雙向絕對誤差和(Modified Sum of Absolute Bi-Prediction Differences, MSABPD)演算法，以節省編碼傳輸位元。最後將MSABPD與S_ZBMD結合，由數據結果顯示，在低位元率下可以節省30.6%的編碼時間，BDBR又可以節省2.56%。

摘要(英)

In recent years, lots of high resolution devices, such as smart phones, tablet, and digital camera…etc. Video compression technology becomes an important issue due to the significant increasing of data storage. A new generation of video compression standard HEVC has better performance than H.264. HEVC has improved video quality and compression efficiency, but the coding complexity also increases a lot. In this thesis, we proposed Simple Zero Block Mode Decision(S_ZBMD) in inter prediction to reduce HEVC computation complexity. We early terminate the CU size by using zero block distribution to select suitable block size and prediction mode for coding time saving. In order to improve the coding efficiency of standard HEVC, we use Modified Sum of Absolute Bi-Prediction Differences algorithm (MSABPD) to save transmitted bits. We eventually combine MSABPD and S_ZBMD to achieve both efficiency improving and time saving. Experimental results show that our proposed algorithm achieve 30.6% time saving and 2.56% BDBR saving compared with HEVC encoder in low bitrate.

關鍵字(中)

★ HEVC
★ 低位元率
★ 模式決策

關鍵字(英)

★ HEVC
★ Low Bitrate
★ Mode Decision

論文目次

第一章緒論
1.1 HEVC視訊壓縮標準介紹
1.2 動機與目的
1.3 論文架構
第二章 HEVC畫面間預測介紹
2.1 高效率視訊編碼架構
2.2 畫面間預測(Inter Prediction)介紹
2.2.1 畫面間模式決策( Inter Mode Decision )
2.2.2 合併模式決策(Merge Mode Decision)
第三章 HEVC畫面間預測之快速模式決策(Fast Mode Decision)研究
3.1 零區塊(Zero Block)演算法介紹及相關文獻回顧
3.2 先進型零區塊模式決策(Advanced Zero Block Mode Decision) 論文回顧
3.3 簡單型零區塊模式決策(Simple Zero Block Mode Decision) 研究
3.3.1 高位元率及低位元率下預測模式之統計特性
3.3.2 效能分析與討論
第四章 HEVC畫面間編碼效能改善之探討
4.1 改良型雙向絕對誤差和(Modified Sum of Absolute Bi-Prediction)決策演算法介紹
4.2 改良型雙向絕對誤差和(MSABPD)決策在合併模式 (Merge Mode)的應用
4.3 改良型雙向絕對誤差和(MSABPD)決策在畫面間模式 (Inter Mode)的應用
4.4 畫面間快速模式決策(Fast Mode Decision)之編碼效能改善
4.4.1 快速畫面間模式決策與改良型合併模式 (MSABPD for Merge Mode)結合之效能
4.4.2 快速畫面間模式決策與改良型畫面間模式(MSABPD for Inter Mode)結合之效能
4.4.3 快速畫面間模式決策編碼效能改善之綜合(MSABPD for both Merge Mode amd Inter Mode)數據分析
第五章結論
參考文獻

參考文獻

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指導教授

林銀議(Yin-yi Lin)

審核日期

2014-7-24

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