H.264畫面跳張轉換編碼之研究

以作者查詢圖書館館藏

、以作者查詢臺灣博碩士

、以作者查詢全國書目

、勘誤回報

、線上人數：76

、訪客IP：18.118.163.176

姓名

江仲豪(Jhong-Hao Jiang) 查詢紙本館藏

畢業系所

通訊工程學系

論文名稱

H.264畫面跳張轉換編碼之研究
(Study of Frame Skipping Transcoding for H.264)

相關論文

★ 10Gb/s MM XFP光收發模組設計與實現	★ 資訊產品自動化測試之研究
★ 高電流密度鰭式氮化鎵高電子遷移率電晶體研究	★ 電子郵件及壓縮檔案解碼之研究
★ 渦輪碼在光學記錄系統上之應用	★ 離散餘弦轉換硬體架構之研究
★ 動態影像之錯誤隱藏研究	★ 即時性無失真壓縮編碼之研究
★ 類神經網路在手寫數字辨識之研究	★ 事後機率演算法則在資料儲存系統之研究
★ 紅外線傳輸協定及通道之研究	★ 低密度同位元檢查碼在數位資料儲存系統之研究
★ 一種新型的JPEG2000竄改偵測與還原技術	★ 即時性無失真壓縮之研究
★ 混合快速模式決策演算法之研究	★ 光學記錄MEPR2通道系統之時序恢復探討與研究

檔案

[Endnote RIS 格式]

[Bibtex 格式]

[相關文章]

[文章引用]

[完整記錄]

[館藏目錄]

[檢視]

[下載]

本電子論文使用權限為同意立即開放。
已達開放權限電子全文僅授權使用者為學術研究之目的，進行個人非營利性質之檢索、閱讀、列印。
請遵守中華民國著作權法之相關規定，切勿任意重製、散佈、改作、轉貼、播送，以免觸法。

摘要(中)

H.264為現在壓縮效果及畫面品質都很好的視訊標準，相較於以往MPEG-2和H.263，H.264在相同位元率下之影像品質獲得大幅改善，因此H.264在多媒體裝置及網路應用上扮演著越來越重要的角色，然而，在不同網路環境下，其傳輸頻寬不同，如何使視訊串流滿足各種頻寬要求是一大課題，而轉換編碼是其中一種可以克服此問題的技術，而本篇論文利用畫面跳張(frame-skipping)的方式將高位元率之H.264視訊串流轉換編碼成為較低位元率的H.264視訊串流，使其能適應不同的頻寬限制，而轉換編碼最直接的作法就是不利用原始資訊直接重新編碼，然而這樣運算複雜度過高，但若完全再利用(reuse)原始資訊將導致編碼效能嚴重下降，因此，為了降低複雜度並維持一定的效能，我們利用原始資訊分別針對區塊模式與移動向量提出了轉換編碼演算法來幫我們簡化移動估測，實驗結果也顯示，能在維持一定的畫面品質效能下，大幅降低轉換編碼的時間。

摘要(英)

The emerging H.264/AVC achieves better coding performance compared with prior video coding standards, and applications of H.264/AVC become popular and important in networked multimedia services, such as teleconferencing, video on demand, and distance learning. However, because different networks might have different limitations of channel bandwidth, it is often needed to reduce the bit-rate of the coded video bit streams. Frame-skipping transcoding is one key technology to provide such interoperability between different systems and devices. The most straightforward method for frame-skipping transcoding is to decode the video stream and re-encode the reconstructed video sequences after frame-skipping. However, the computational complexity of the fully decoding and re-encoding process, referred to as complex cascaded pixel domain transcoding (CCPDT), is extremely high.
Reusing information existing in the original incoming video stream, referred to as simple cascaded pixel domain transcoding (SCPDT) can reduces computational complexity but lead to severe degradation in coding performance due to mode and motion vector mis-matched problems. Consequently, to reduce the computation cost and maintain high coding performance during transcoding, we propose an efficient inter/intra mode decision algorithm and an efficient motion vector composition method. The experimental results show that our proposed transcoding algorithms can maintain high coding performance and speed up transcoding process simultaneously for a reduced frame rate video transcoder.

關鍵字(中)

★ 移動再估測
★ 區塊模式決策
★ 畫面跳張轉換編碼

關鍵字(英)

★ motion re-estimation
★ mode decision
★ frame-skipping transcoding

論文目次

第一章緒論
1.1 H.264視訊壓縮標準簡介 1
1.2 動機與目的 2
1.3 論文架構 3
第二章 H.264 基本原理及視訊轉換編碼器介紹
2.1 轉換編碼(Transcoding)系統簡介 4
2.2 畫面跳張轉換編碼演算法文獻回顧 7
2.3 H.264視訊編碼系統簡介 8
2.3.1畫面間(Inter)預測模式 8
a. 可變區塊大小(variable block size) 8
b. 非整數點移動向量(fractional motion estimation) 9
c. 多幅參考畫面(multi-reference frame) 10
2.3.2畫面內(Intra)預測模式 14
第三章畫面跳張轉換編碼中區塊模式決策演算法之研究
3.1 畫面跳張轉換編碼系統簡介 17
3.1.1轉換編碼之旁資訊擷取 18
3.2 區塊模式決策演算法之分析與探討 21
3.2.1 複雜型像素域轉換編碼 22
3.2.2簡易型像素域轉換編碼 22
3.3 區塊模式預測分佈機率統計與分析 24
3.4 增強型(Enhanced)區塊模式決策演算法之分析與探討 30
3.4.1固定型雙向搜尋演算法 30
3.4.2加強型雙向搜尋演算法 34
3.5 綜合效能分析與比較 41
3.6 結論 45
第四章畫面跳張轉換編碼中移動估測演算法之研究
4.1 移動估測演算法之分析與探討 46
4.1.1簡易型像素域轉換編碼 46
4.2 相鄰多幅參考畫面選擇演算法 49
4.3 基於相鄰多幅參考畫面選擇之移動向量合成演算法探討 54
4.3.1 平均權重之預測向量 56
4.3.2 前向式主導向量選取演算法 60
4.3.3 加強型前向式主導向量選取 61
4.3.4 權重型向量選取演算法 62
4.4 合成移動向量之區域搜尋(zonal search)演算法 71
4.4.1 強化型區域搜尋演算法 72
4.4.2 進階強化型區域搜尋演算法 78
4.5 結論 81
第五章結論和未來展望 82
參考文獻 83

參考文獻

[1] “Draft ITU-T recommendation and final draft international standard of Joint Video Specification (ITU-T Rec. H.264 | ISO/IEC 144496-10 AVC),” Joint Video Team of ISO/IEC and ITU-T, Nov. 2007.
[2] “Generic coding of moving pictures and associated audio information,” ISO/IEC 13818-2: Video (MPEG-2), May 1996.
[3] “Video coding for low bit rate communication, version 1,” ITU-T Recommendation H.263, 1995.
[4] “Coding of audio-visual objects - part 2: visual,” in ISO/IEC 14496-2 (MPEG-4 Visual Version 1), April 1999.
[5] T. Wiegand, G.J. Sullivan, G.. Bjontegaard and A. Luthra, “Overview of the H.264/AVC video coding standard,” IEEE Transactions on Circuits and Systems for Video Technology, vol.13, pp.560-576, July 2003.
[6] C. D. Wu and Y. Lin, “Efficient inter/intra mode decision for H.264/AVC inter frame transcoding,” in Proc. IEEE International Conference on Image Processing, 2009, pp. 3697-3700.
[7] J. Youn, M. T. Sun and C. W. Lin, “Motion vector refinement for high-performance transcoding,” IEEE Transactions on Multimedia, vol. 1, no. 1, pp. 30-40, March 1999.
[8] M. J. Chen, M. C. Chu and C. W. Pan, “Efficient motion estimation algorithm for reduced frame-rate video transcoder,” IEEE Transactions on Circuits and Systems for Video Technology, vol. 12, no. 4, pp. 269-275, April 2002.
[9] K. T. Fung, Y. L. Chan and W. C. Siu, “Low-complexity and high-quality frame-skipping transcoder for continuous presence multipoint video conference,” IEEE Transactions on Multimedia, vol. 6, no. 1, pp. 31-46, February 2004.
[10] K. T. Fung, Y. L. Chan and W. C. Siu, “New architecture for dynamic frame-skipping transcoder,” IEEE Transactions on Image Processing, vol. 11, no. 8, pp. 886-900, August 2004.
[11] W. J. Lee and W. J. Ho, “Adaptive frame-skipping for video transcoding,” in Proc. IEEE International Conference on Image Processing, September 2003, vol. 1, pp. I-165-8, 14-17.
[12] J. N. Hwang, T. D. Wu, and C. W. Lin, “Dynamic frame-skipping in video transcoding,” in Proc. IEEE Second Workshop on Multimedia Signal Processing, Dec. 1998, pp. 616-621, 7-9.
[13] J. Youn, and M. T. Sun, “Fast motion vector composition method for temporal transcoding,” in Proc. IEEE International Symposium on Circuits and Systems, June 1999, vol. 4, pp. 243-246.
[14] S. Yang, D. Kim, Y. Jeon, and J. Jeong, “An efficient motion re-estimation algorithm for frame-skipping video transcoding,” in Proc. IEEE International Conference on Image Processing, September 2005, vol. 3, pp. III - 668-71.
[15] J. D. Wu, Study of H.264 intra frame coding and transcoding, NCU, Taiwan, July 2008.
[16] W. C. Teng, Study of spatial downsizing transcoding for H.264, NCU, Taiwan, June 2009.
[17] H. H. Hsu, H.264/H.263/MPEG-2 to H.264 intra and inter frame transcoding, NCU, Taiwan, June 2009.
[18] J. Youn, and M. T. Sun, “Motion estimation for high performance transcoding,” in Proc. IEEE International Conference on Consumer Electronics, June 1998, pp. 136-137.
[19] B. Shen, I. E. Sethi and B. Vasudev, “Adaptive motion vector resampling for compressed video down-scaling,” in Proc. IEEE International Conference on Image Processing, Oct. 1997, vol. 1, pp. 771-774.
[20] F. Lonetti and F. Martelli, “Motion vector composition algorithm in H.264 transcoding,” in Proc. IEEE International Conference on Image Processing, June 2007, no. 4, pp. 401-401.
[21] F. Pan, Z. P. Lin, X. Lin, S. Rahardja, W. Juwono and F. Slamer, “Content adaptive frame skipping for low bit rate video coding,” in Proc. IEEE International Conference on Information, Communications and Signal, Dec 2003, vol. 1, pp. 230-234.
[22] Joint Video Team software JM12.2
http://iphome.hhi.de/suehring/tml/download/

指導教授

林銀議(Yinyi Lin)

審核日期

2010-7-19

推文