臉部參數之無線環境傳輸｜國立清華大學博碩士論文庫

簡易檢索 / 詳目顯示

回結果列表

研究生：	劉建宏 Chien-Hung Liu
論文名稱：	臉部參數之無線環境傳輸 MPEG4 Facial Animation over Wireless Network
指導教授：	陳永昌 Yung-Chang Chen
口試委員:
學位類別：	碩士 Master
系所名稱：	電機資訊學院 - 電機工程學系 Department of Electrical Engineering
論文出版年：	2004
畢業學年度：	92
語文別：	英文
論文頁數：	46
中文關鍵詞：	超低位元傳輸、臉部參數、錯誤更正
外文關鍵詞：	very low bit-rate communication, Facial Animation Parameter, Error Control
相關次數：	點閱：3 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

無線通訊已經成為現代人生活中不可或缺的一部份，而自從寬頻時代來臨後，通訊的定義也漸漸由聲音的傳輸轉變為影像的傳輸。為了達到多媒體的通訊的目標，許多相關的規格被訂定，如H.264 (ITU)和MPEG4 (ISO)等。雖然如此，但是要達到一定品質的傳輸，頻寬仍然不足。為了在有限的頻寬上使用，MPEG4定義了超低位元傳輸 ( very low bit-rate communication )，利用68個重要的參數(FAP)，描述動態臉部的表情動作，利用此傳輸技術，可在1k的有限頻寬下，達到即時 ( real-time )的對談。但是在頻寬變動及多干擾的通訊環境下，資料被破壞相當嚴重，且由於FAP是十分重要的參數，只要有少許的錯誤，就會立即的造成畫面被毀滅，所以我們應該如何有效的保護這些參數，就成為了十分重要的問題。本論文針對MPEG4所定義超低位元編碼的形式，對不同的BER討論burst error和packet loss的影響以及保護的方法。

Wireless communication including WIFI has become an essential part in modern society. In the meanwhile, multimedia communication is shifting voice dominance into video accompanying when bandwidth gets broader. For the purpose of multimedia communication, many related standards have been defined, such as H.264 (ITU) [1] and MPEG-4 (ISO) [2], etc. Nevertheless, the bandwidth is still insufficient for high quality service. To meet the bit-rate requirement, MPEG4 defines the very low bit rate communication [3], which uses 68 significant facial animation parameters (FAP) to describe facial expression and can achieve real-time transmission even under 1 kbps. However, the data will be seriously ruined in the environment with fluctuating bandwidth and noisy channel. Owing to the significance of the FAPs, a frame may be entirely destroyed even though there are only few errors. It has become an important issue about how to protect these parameters. This thesis focuses on the efficient protection from bursty errors and packet losses at different bit error rates (BER) in the very low bit-rate format defined by MPEG-4.

Abstract 　　　　　　　　　　　　　　　  　　　　　 　I

Contents 　　　　　　　　　　　　　　　　　　　　  　II

Chapter 1: Introduction 　　　　　　　　　　　　　　　1
1 Background .　　　　　　　　　　　　　　　　　　　1
1.1 MPEG-4 Facial Animation on transmission 　　　　1
1.2 Convolution Encoder                             4
1.3 BCH Encoder                                     5
2 Motivation                                        5
3 Thesis organization                               6

Chapter 2: UDP-Lite                                   8

Chapter 3: Communication System for FAPs              11
1 System architecture                               11
1.1 Convolution Encoder                             12
1.2 BCH Encoder                                     15
2 Packet Format                                     15
3 BitMask Protection                                16
4 Protection of FAP values                          20

Chapter 4: Switch Mode                                23
1 Switch Mode                                       23
2 Error Concealment                                 29
2.1 Error Concealment of BitMask                    30
2.2 Error Concealment of FAP value                  31
3 Error concealment over WIFI                       31

Chapter 5: Experimental Result                        33
1 Simulation Environment                            33
2 Error Resilience                                  33
2.1 BitMask Protection                              34
2.2 FAP value Protecion                             35
3 Switch Mode                                       39
3.1 DBCH and BCH                                    39
3.2 Error Concealment of BitMask                    39
3.3 Error Concealment of FAP values                 40
4 Error Concealment over WIFI                       41

Chapter 6: Conclusion and Future work                 43

Reference                                             45

                                

[1]Text of ISO/IEC FDIS 14496-10 ,Advanced Video Coding, Final Draft, 2003 .
[2]Text of ISO/IEC FDAM2 14496-1, Systems, AMENDMENT, Final Draft, 2002.
[3]Text of ISO/IEC FDIS 14496-2 : Visual, “ISO/IEC JTC1/SC29/WG11 N2502, Atlantic City MPEG MEETING, Oct, 1998.
[4]Worral,S.T., Sadka,A.H., Kondoz,A.M., ”3D facial animation for very low bit rate mobile video” Proceedings of 35th Annual Simulation Symposium ,2002 .
[5]Murat Tekalp and Jorn Ostermann, MPEG4 FACIAL ANIMATION PROJECT, http://www.cs.technion.ac.il/~gip/projects/s2002/Dmitry_Vadim_MPEG4/index.htm .
[6]Maria Fresia, Carlo Bonamico, Fabio Lavagetto, Roberto Pockaj, “An Encoding/Packetization Solution for MPEG-4 Facial Animations Delivery over RTP ”, Proc. of IWDC'02 - Tyrrenian International Workshop on Digital Communications, 2002
[7]Larzon, L.-A., et al., “The UDP-Lite Protocol”, Internet Draft, Internet Engineering Task Force, Dec. 2002. Work in Progress.
[8]H. Zheng and J. Boyce. “An improved UDP protocol for video transmission over internet-to-wireless networks”. IEEE Trans. on Multimedia. 3(3): 356-365. 2001.
[9]Toshio Miki, Toshiro Kawahara and Tomoyuki Ohya, “Revised Error Pattern Generation Programs for Core Experiments on Error Resilience ”, ISO/IEC JTC1/SC29/WG11 MPEG96/1492, 1996
[10]Di Giacomo,T ; Joslin, C.;Garchery, S ; Magnenat-Thalmann,N. “Adaptation of facial and body animation for MPEG-based architectures”, Proceedings, 2003 Intermational Conference on Cyberworlds, 2003, 21-228 .

全文公開日期本全文未授權公開 (校內網路)
全文公開日期本全文未授權公開 (校外網路)

簡易檢索 / 詳目顯示

相關論文