WiMAX環境下基於傳輸速率最佳化之可適性視訊編碼傳輸品質增進

簡易檢索 / 詳目顯示

回結果列表

研究生：	陳冠宇 Kuan-yu Chen
論文名稱：	WiMAX環境下基於傳輸速率最佳化之可適性視訊編碼傳輸品質增進 SVC Video Quality Improvement Based on Optimized Transmission Rate over WiMAX
指導教授：	吳中實 Jung-shyr Wu
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 Department of Communication Engineering
畢業學年度：	99
語文別：	中文
論文頁數：	52
中文關鍵詞：	可適性視訊編碼
外文關鍵詞：	Scalable Video Coding
相關次數：	點閱：17 下載：0
分享至:	分享至facebook 分享至twitter

查詢本校圖書館目錄查詢臺灣博碩士論文知識加值系統勘誤回報

可適性視訊編碼(Scalable Video Coding；SVC)為H.264/AVC 影像編碼技術的延伸，除了原本H.264/AVC 的低位元輸出率、高抗錯性及網路友善性的優點，還加入了分層編碼的概念，提供了三種可調性：時間、空間及訊噪比可調性，可以依據網路的狀況和用戶端的裝置動態調整至至最適當的bitstream。
即使SVC 有分層的概念，但當SVC 在無線的環境傳輸時，因為無線的環境下頻寬的資源有限，且通道變化大，因為SVC 分層的特性使得每一層的碼率及重要性皆不相同，若在傳輸每一個Layer 皆採用相同的實體層設定，則較無法充份利用SVC 之特性進行傳輸。
因此，本文要探討的範圍在IEEE 802.16e Mobile WiMAX 的環境下，基於SVC 各層採用不同的實體層設定，如何針對訊噪比、傳輸速率及誤碼率之間選擇最適合該層的調變與編碼環境。

The Scalable Video Coding (SVC) is an extension of H.264/AVC. In addition to the advantage of original H.264/AVC with output of the low bit rate,high resistance of fault and network friendliness, it also owns the concept of layered coding, and offers three scalability: temporal, spatial and SNR which can be based on network conditions and client devices to dynamically adjust to the most appropriate bitstream.
When the SVC transmitting in the wireless environment,because the bandwidth of the wireless environment is limited, and channel condition changes, the layered coding makes the SVC bit-rate and the importance of each layer are not the same if each layer in the transmission has the same PHY configuration. It is unable to take full advantage of the characteristics of SVC
transmission. Here, we propose a mechanism based on ILA that lets PHY Layer configuration for each SVC layer to optimizing the transmission rate for each SVC layer.

摘要 ........................................................................................................................................ Ⅰ
Abstract ................................................................................................................................. Ⅱ
誌謝 ........................................................................................................................................ Ⅲ
目錄 ........................................................................................................................................ Ⅳ
圖目錄 ................................................................................................................................... Ⅵ
表目錄 ................................................................................................................................... Ⅷ
第一章 序論 ........................................................................................................................ 1
1.1 前言 ....................................................................................................................... 1
1.2 研究動機 .............................................................................................................. 2
1.3 論文架構 .............................................................................................................. 2
第二章 相關背景及研究 ................................................................................................. 4
2.1 H.264/SVC .............................................................................................................. 4
2.1.1 視訊編碼層(Video Coding Layer) ....................................................... 7
2.1.2 網路提取層(Network Abstraction Layer) ......................................... 8
2.1.3 NAL unit ..................................................................................................... 11
2.1.4 時間可調性(Temporal Scalability) .................................................. 13
2.1.5 空間可調性(Spatial Scalability) ....................................................... 14
2.1.6 訊噪比可調性(SNR Scalability) ...................................................... 14
2.2 802.16e Mobile WiMAX.................................................................................. 15
2.2.1 實體層 ....................................................................................................... 15
2.2.2 可適性調變及編碼 ................................................................................ 16
2.2.3 ARQ ............................................................................................................. 17
第三章 SVC 傳輸速率最佳化之策略 ..................................................................... 19
3.1 Bit Extraction Process .................................................................................... 19
3.2 Transmission SVC over WiMAX ............................................................... 20
3.2.1 Intelligent Link Adaptation .................................................................... 22
3.2.2 在傳輸容量限制下得到最佳影像品質 ............................................ 23
3.3 Intelligent Link Adaptation Plus ..................................................................... 24
3.3.1 Dynamic Modulation Selection ............................................................ 26
3.3.2 影像品質的增進 ...................................................................................... 28
第四章 模擬數據與討論 .............................................................................................. 30
5.1 模擬環境參數 ................................................................................................. 30
5.2 實驗數據與分析 ............................................................................................. 32
第五章 結論 ..................................................................................................................... 38
參考文獻 .............................................................................................................................. 39

                                

[1] H. Schwarz, D. Marpe, and T. Wiegand, “Overview of the
scalable H.264/MPEG4-AVC extension,” in Proc. IEEE ICIP,
Oct. 2006, pp.161–164.
[2] Iain E G Richardson, “”H.264 and MPEG-4 Video Compression:Video Coding for Next Generation Multimedia,” John Wiley & Sons, 2003
[3] ITU-T and ISO/IEC JTC 1, “Advanced Video Coding for
Generic Audiovisual Services, ”ITU-T Recommendation H.264
and ISO/IEC 1449610 (MPEG-4 AVC),Version 8 (including
SVC extension):Consented in July 2007.
[4] WENGER Stephan, WANG Ye-kui and HANNUKSELA Miska
M., “RTP payload format for H.264/SVC scalable video coding,”Journal of Zhejiang University SCIENCE A, 2006 7(5):657-667
[5] JR Ohm, “Advances in Scalable Video Coding,” Proceedings of the IEEE, Vol.93, No.1, pp.42-56, Jan.2005”
[6] Jeffrey G. Andrews, Arunabha Ghosh, Rias Muhamed, “Fundamentals of WiMAX: understanding broadband wireless networking,” ISBN 0-13-222552-2,Pwarson Education,Inc.,2007
[7] Y. Pourmohammadi-Fallah, H. Mansour, S. Khan, P. Nasiopoulos, and H. Alnuweiri, “A Link Adaptation Technique
for Efficient Transmission of H.264 Scalable Video Over
MultirateWLANs,” IEEE Transactions on Circuits and Systems
for Video Technology, vol. 18, no. 7, pp. 875–887, July 2008.
[8] IEEE 802.16 Working Group, “IEEE Standard for Local and
Metropolitan Area Networks–Part 16: Air Interface for Fixed
Broadband Wireless Access Systems, Amendment 2: Physical
and Medium Access Control Layers for Combined Fixed and
Mobile Operation in Licensed Bands,” IEEE Std. 802.16e-2006,Feb 2006.
[9] Mai Tran, George Zaggoulos, Andrew Nix, and Angela Doufexi.Mobile WiMAX: Performance Analysis and comparison with experimental results. In Proc. IEEE VTC, pages 1–5, September2008. 52
[10] Text of ISO/IEC 14496-4:2001/PDAM 19 Reference Software for SVC, Joint Video Team (JVT) of ISO-IEC MPEG & ITU-T VCEG, N9195,Sep. 2007.
[11] I. Amonou, N. Cammas, S. Kervadec, and S. Pateux, “Optimized rate-distortion extraction with quality layers,” IEEE Trans. Circuits Syst.Video Technol., vol. 17, no. 9, pp. 1186–1193, Sep.2007

簡易檢索 / 詳目顯示

相關論文