H.264快速畫面內模式決策之研究

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姓名

黃功勝(Gon-shen Huang) 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快速畫面內模式決策之研究
(Study of H.264 fast intra mode decision)

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摘要(中)

新一代的視訊壓縮標準H.264/AVC 比目前的影像標準可獲得更高的壓縮率及影像品質。為此，效能的提升也必須使用龐大的計算量來達到此效果。因此，如何降低畫面內預測的複雜度，將是本篇論文討論的方向。根據統計分析結果，我們提出模糊區間低頻交流值快速畫面內模式預測，經由修改低頻交流值演算法架構，在畫面內模式預測加入模糊區間，利用不同大小區間，在固定參數模式用來做畫面內模式預測。藉以提高演算法的影像品質、降低位元率以及減少運算的時間。由實驗效能分析結果，在些微的效能品質降低的情況下，可以節省平均50%的編碼時間。

摘要(英)

H.264 supports many advanced compression techniques that can achieve better coding performance than the previous standards. However, the compression techniques require high computational complexity, increase the encoding time .One important technique is intra mode decision. We present an enhanced AClow intra mode decision for H.264/AVC to reduce the computation complexity while maintaining coding performance. The correct rate of ambi AClow algorithm is increased to 87% when considering ambiguous region. To obtain high coding efficiency, SATD-based intra mode decision is also applied to intra mode decision. The experimental results show that our proposed algorithm can achieve 50% of time saving on average

關鍵字(中)

★ 畫面內模式決策

關鍵字(英)

★ intra mode decision
★ H.264

論文目次

第一章緒論………………………………………………………..…………1
1.1 研究背景與動機…………………………………………………..……1
1.2 H.264視訊壓縮標準介紹………………………………………..…….2
1.2.1 H.264架構介紹…………………………………………….……..3
1.2.2 畫面內(intra)預測模式…………………………………..……….3
1.2.3 畫面間(inter)預測模式………………………………….………..8
1.2.4 轉換、量化與熵編碼………………………………………..……8
1.3 架構…………………………………………………………………….9
第二章快速畫面內編碼的演算法回顧……………………………………11
2.1 絕對轉換誤差和(SATD-based)之快速畫面內演算法[10][11]……...11
2.2低頻交流值(AClow )畫面內編碼的演算法…………………….…...…12
2.3基於熵區塊模式決策(entropy feature)畫面內編碼演算法[15]…..…17
2.4基於支配邊的方向(DED)之快速畫面內演算法[20]…………………18
2.5低頻交流值與熵區塊模式決策畫面內編碼效能分析[22]…………...19
2.5.1環境参數設定………………………………………………..……20
2.5.2效能分析…………………………………………………………..22
2.5.3結論………………………………………………………………..28
第三章增強型低頻交流值快速畫面內編碼的演算法…………………....30
3.1在固定量化参數不同K值對模糊區間影響………………………….30
3.1.1固定量化参數不同效能比較………………………………….31
3.1.2固定量化参數效能比較…………………………………………..39
3.1.3非固定量化参數效能比較………………………………………..42
3.2增強型低頻交流值效能分析 (M_AClow) ……………………………44
3.2.1固定量化参數效能比較…………………………………………..44
3.2.2非固定量化参數效能比較…………………………………….….47
3.2.3增強型快速畫面內模式決策結論……………………..…………51
第四章結論與未來展望…………………………………………………....53
參考文獻…………………………………………...…………………………54

參考文獻

[1] “Advanced Video Coding for Generic Audiovisual Services ” (ITU-T Rec. H.264 | ISO/IEC 144496-10 AVC),” Joint Video Team of ISO/IEC and ITU-T, March 2005.
[2] “Video codec for audio visual services at px64 k bits/s,” ITU-T recommendation H.261, 1990.
[3] ISO/IEC International Standard 11172-2, Information technology – Coding of moving pictures and associated audio for digital storage media up to about 1.5 Mbits/s – Part 2: Video, Aug. 1993.
[4] ISO/IEC International Standard11172-2, Information technology – Coding of moving pictures and associated audio for digital storage media up to about 1.5 Mbits/s – Part 2: Video, first edition, Aug. 1993.
[5] ISO/IEC International Standard 13818-2, Generic coding of moving pictures and associated audio – Part 2: Video, 1995.
[6] ITU-T T.81, Information Technology – Digital Compression and Coding of Continuous-Tone Still Images – Requirements and Guidelines, Sep. 1992.
[7] W. B. Pennebaker and J. L. Mitchell, JPEG Still Image Data Compression Standard,” Feb.1992, vol.38, no.3, pp.860-874
[8] ITU-T Recommendation H.263, Video Coding for Low Bit Rate Communication, version 1, Nov. 1995; version2, Jan. 1998; version 3, Nov. 2000.
[9] K. Rijkse, “H.263: video coding for low-bit-rate communication,” IEEE on Communication Magazine, vol.34, no.12, pp42-45, May. 1996.
[10]Y. T. Sun and Y. Lin, “SATD-based intramode decision for H.264/AVC video coding,” Proceeding of IEEE International Conference on Multimedia and Expo, June.2008, pp.61-64
[11] ]Y. M. Lee, Y. T. Sun and Y. Lin, “SATD-based intra mode decision for H.264/AVC video coding,” IEEE Transactions on Circuits and Systems for Video Technology, vol. 20, no. 3, pp. 463-469, Mar. 2010.
[12] W. Lin, A. Tsai, J. Wang and J. Yang, “A simple direction detection algorithm for fast H.264 intra prediction,” Proceeding of IEEE Technical conference, Oct. 2007, pp. 1-4
[13] Z. Wei, H. Li and K. N. Ngan, “An efficient intra mode selection algorithm for H.264 based on fast edge classification,” IEEE Transactions on Circuits and Systems, pp. 3630-3633, May. 2007.
[14] C. Kim , H.H. Shih and C. J. Kuo, “Feature-based intra-prediction mode,” Proceeding of IEEE Technical conference, Oct. 2004, vol 2, pp. 769-772
[15] G. F. Tian, T. Zhang, X. H. Wei and S. Goto, “A block type decision algorithm for H.264/AVC intra prediction based on entropy feature,” Proceeding of IEEE Asia Pacific Conference on Circuits and Systems, Dec. 2008, pp. 1348-1351
[16] H.264/AVC reference software JM12.2, [online].available: http://iphome.hhi.de/suehring/tml/
[17] Y. Huang, B. Hsieh and U. Chen, “Analysis, fast algorithm and VLSI architecture design for H.264/AVC intra frame coder,” IEEE Transactions on Circuits and System for Video Technology, vol.15, pp. 378-401, Mar.2005.
[18]Z. Wei, H. Li and K. N. Ngan, “An efficient intra mode selection algorithm for H.264 based on fast edge classification,” Proceeding of IEEE International Symposium on Circuits and Systems, pp. 3630-3633, June. 2007.
[19] Y.K. Lin and T. S. Chang, “Fast block type decision algorithm for intra prediction in H.264 FRext,” Proceeding of IEEE International Conference on Image Proceeding, Sep.2005, vol.1, pp. 585-588
[20] B. La, M. Eom and Y. Choe, “Fast mode decision for intra prediction in
H.264/AVC encoder,” Proceeding of IEEE Technical conference, Sept. 2007, pp. V-321-V-324
[21] C. H. Tseng, H. M. Wang and J. F. Yang, “Enhanced intra-4x4 mode decision for H.264/AVC coders,” IEEE Transactions on Circuits and Systems for Video Technology, Vol.16, pp .1027-1032, May.2006.
[22] Y. M. Lee, J. D. Wu and Y. Lin, “An improved SATD-based intra mode decision algorithm for H.264/AVC,” Proceeding of International Conference on Acoustics, Speech and Signal Processing (ICASSP), pp. 1029-1032, Apr. 2009.

指導教授

林銀議(Yinyi Lin)

審核日期

2010-7-13

推文