H.264至HEVC轉換編碼之量化參數配置優化研究｜國立中央大學博碩士論文系統

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研究生：	林美芬 LIN, MEI-FEN
論文名稱：	H.264至HEVC轉換編碼之量化參數配置優化研究 Efficient quantization parameter configuration for H.264-to-HEVC transcoding
指導教授：	張寶基 Pao-Chi Chang
口試委員:
學位類別：	碩士 Master
系所名稱：	資訊電機學院 - 通訊工程學系在職專班 Executive Master of Communication Engineering
論文出版年：	2017
畢業學年度：	105
語文別：	中文
論文頁數：	124
中文關鍵詞：	H.264/AVC 、HEVC 、轉碼、量化參數、降取樣、升取樣
相關次數：	點閱：18 下載：0
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視訊壓縮標準H.265/HEVC是由JCT-VC (ISO/IEC MPEG和 ITU-TVCEG)所開發與制定，其編碼效率相較於過去的視訊壓縮標準H.264/AVC有大幅的提升，僅需約H.264/AVC之50%的位元率，即能達到與之相同的序列品質，然而還無法取代目前最普及的視訊壓縮標準H.264/AVC。此外，隨著硬體設備品質要求越來越高的情況下，例如電視的超高畫質序列(Ultra High Definition, UHD)等等，因此，H.264有效率地轉碼至HEVC編碼架構是目前探討的重要課題。
本論文探討優化H.264轉碼至HEVC的編碼架構，其中分為兩部分，第一部分為討論將原始的解析度序列進行H.264及HEVC編解碼，參考不同的量化參數配置、序列特性及實驗配置，決定經過H.264編解碼後的序列是否值得再進行HEVC轉碼；第二部分則改變輸入序列，將原始的解析度序列進行降取樣，接著由H.264及HEVC編解碼，之後再將輸出序列進行升取樣。實驗結果顯示，與序列由H.264進行編碼且量化參數為27的結果相比，序列以H.264進行編碼且量化參數為23轉碼至HEVC編碼且量化參數為27可以降低61%位元率，且PSNR仍然維持約38.12dB的序列品質。

The newest video compression standard H.265/HEVC is developed by JCT-VC (ISO / IEC MPEG and ITU-TVCEG), and it could achieve high coding efficiency compared with H.264/AVC. However, it could not replace H.264/AVC which is the most popular video compression currently. In addition, as the quality requirements of hardware devices become higher and higher, such as Ultra High Definition (UHD), and so on. Therefore, transcoding for H.264 to HEVC efficiently is currently important study .
Efficient quantization parameter configuration for H.264-to-HEVC transcoding in this thesis to optimize the transcoding for H.264 to HEVC. The study is divided into two parts, the first part is coding and decoding the original sequence on H.264 and HEVC, and utilize different quantization parameters, image characteristics and experimental environment. Furthermore, the second part is to change the input sequence, up-sampling and down-sampling the original sequence, then followed by H.264 and HEVC codec. Experimental results show that the sequence which is encoded by H.264 and QP is 23 then transcode to HEVC and QP is 27 could reduce 61% bitrate and PSNR is still about 38.12 dB, compared to the sequence coded by H.264 and QP is 27.

摘要     V
ABSTRACT    VI
致謝     VII
目錄     VIII
附圖索引    XI
附表索引    XIV
第一章 緒論    1
1 研究背景    1
2 研究動機與目的    1
3 論文架構    2
第二章 HEVC 視訊編碼標準介紹    4
1 HEVC 視訊編碼介紹    4
1.1 HEVC與H.264/AVC視訊編碼標準發展與應用    4
1.2 編碼流程介紹    6
2 HEVC視訊編碼架構介紹    7
2.1 編碼單位 (Coding Unit, CU)    7
2.2 預測單位 (Prediction Unit, PU)    8
2.2.1畫面內預測 (Intra prediction)    9
2.2.2 畫面間預測 (Inter prediction)    11
2.3 轉換單位 (Transform Unit, TU)    11
2.3.1 轉換 (Transform)    12
2.3.2 量化 (Quantization)    12
2.4 殘餘四分樹 (Residual Quad-tree)    13
3環境設定及視訊樣本介紹    14
3.1 環境設定    14
3.2 視訊樣本介紹    17
第三章 基於H.264轉HEVC研究介紹    19
1模擬編碼架構    19
2序列在原解析度之複雜度探討    21
2.1 序列用JM和HM編碼之R_D關係    21
2.2序列JM轉HM之位元失真表現    30
2.2.1 序列在AI實驗環境    30
2.2.1 序列在LD_P實驗環境    37
2.2.1 序列在LD_B實驗環境    43
2.2.1 序列在RA實驗環境    49
3 降解析度序列複雜度之探討    55
3.1 降取樣序列JM和HM編碼之R_D關係    56
3.2 降取樣序列JM轉HM之位元失真表現    65
3.3.1 低解析度序列在AI實驗環境    65
3.3.2 低解析度序列在LD_P實驗環境    72
3.3.3 低解析度序列在LD_B實驗環境    79
3.3.4 低解析度序列在RA實驗環境    86
第四章 實驗結果與討論    94
1實驗參數環境設定    94
2 序列優化之分析    95
2.1 AI實驗環境結果    95
2.2 LD_P實驗環境結果    98
2.3 LD_B實驗環境結果    101
2.4 RA實驗環境結果    104
第五章 結論及未來展望    107
參考文獻    108

                                

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