博碩士論文 104523015 詳細資訊




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姓名 林立(Li Lin)  查詢紙本館藏   畢業系所 通訊工程學系
論文名稱 降低一種先導性畫面間預測計算複雜度之研究
(Reduction of Computational Complexity for an Advanced HEVC Inter Prediction)
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摘要(中) 近年來隨著技術進步以及人類需求,許多高解析度的多媒體產品也越來越多,而為了能夠有效壓縮伴隨著高解析度而來的龐大資料量,HEVC使用許多的方法來有效的降低位元率。回顧先前研究,將雙向絕對誤差和(Sum of Absolute Bi-Prediction Differences/SABPD)與模板匹配(Template Matching/TM)演算法應用於擴充型合併模式決策以及畫面間模式決策,相較於HEVC標準架構中的合併模式決策與畫面間模式決策,其利用已編碼完成的資訊來進行預測,在解碼端搜尋到相同預測畫面,如此便能減少需要傳送的標頭檔資訊,以節省傳送的位元率,但編碼時間也因為計算複雜度提升有所增加。為了能夠降低運算複雜度,本篇論文中改變了模板匹配的參考範圍、利用畫面間模式決策之運動向量資訊以及合併模式RDO來提前終止畫面間預測。最後將其做結合,由實驗結果得知,編碼時間減少了19.19%,BDBR僅上升0.09%。
摘要(英) With the advancement of technology and high requirement, multimedia devices that have high resolution started to rapidly increase in numbers. In order to compress the significant increasing of data storage effectively, HEVC utilize multiple techniques to efficiently decrease bitrate。Review the previous work which using Sum of Absolute Bi-Prediction Differences(SABPD) and Template Matching(TM) algorithm in extended merge mode decision and inter prediction mode and utilizing encoded information to predict. With such comparison against merge mode decision and inter mode decision of HEVC, the decoder can predict the same predicted block with the same information, so we can reduce transmitting header information to decrease bitrate. However, the coding time might be longer due to the increase of computational complexity. In order to decrease the computational complexity, we proposed the change of TM range, 〖Early Inter〗_MV and 〖Early Inter〗_RDO to early terminate inter prediction. At last we combine the methods together. According to experimental results, our proposed algorithm receives a result in decreasing the coding time by 19.19% by only increase BDBR by 0.09%
關鍵字(中) ★ HEVC
★ 雙向絕對誤差和
★ 畫面間預測
★ 模板匹配
★ 鄰近RDO
關鍵字(英) ★ HEVC
★ Sum of Absolute Bi-Prediction Differences
★ Inter Prediction
★ Template Matching
★ Neighboring RDO
論文目次 第一章 緒論 1
1.1 HEVC視訊壓縮標準介紹 1
1.2 高效率視訊編碼架構介紹 2
1.3 畫面間預測介紹(Inter Prediction) 9
1.3.1合併模式決策介紹(Merge Mode Decision) 9
1.3.2.畫面間模式決策介紹(Inter Mode Decision) 12
1.4 研究動機及目的 16
1.5 論文架構 16
第二章 合併模式與畫面間模式論文回顧 17
2.1 擴充型合併模式決策回顧 17
2.2畫面間模式決策回顧 26
第三章 降低畫面間模式決策(Inter Mode Decision)複雜度之探討 33
3.1 模板匹配範圍之探討 33
3.1.1 效能分析及討論 34
3.2 根據移動向量資訊之畫面間模式提早決策研究 41
3.2.1 效能分析及討論 44
第四章 降低畫面間預測(Inter prediction)複雜度之探討 49
4.1 利用RDO探討畫面間預測之提早決策研究 49
4.2 調整鄰近RDO之畫面間預測提早決策研究 55
4.2.1改變模板匹配範圍與根據運動向量及RDO資訊之畫 64
面間模式提早決策(InterN/8and Early InterMV+RDO) 64
結合之效能探討 64
第五章 結論 71
參考文獻 73
參考文獻
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指導教授 林銀議(Yin-yi Lin) 審核日期 2017-7-20
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