适用於WiMAX之H.264视讯编解码器.pdf

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2008/10/23 1 適用於WiMAX之視訊編解碼器 國立台北科技大學資訊工程研究所 指導教授:楊士萱 學生:顏仁暉 2008/10/23 2 Outline † 動機與目的 † WiMAX Introduction † Error Resilience Tool † Error Concealment Method † 實驗比較項目 † 程式操作流程 † 未來工作 † Reference 2008/10/23 3 研究動機與目的 † 動機 „ WiMAX與結合發展殺手級應用 † 目的 „ 找出適用於WiMAX 之 Error Resilience Tool and Error Concealment Method 參數設定並搭配QoS機制 以提升視訊傳輸的服務品質。 2008/10/23 4 WiMAX(1/2):Introduction [2] Service-specific convergence sublayer (CS) MAC common part sublayer (MAC CPS) Security sublayer Physical layer (PHY) CS SAP MAC SAP PHY SAP IEEE reference model 2008/10/23 5 WiMAX(2/2):QoS Service Flow [2] QoS Category Applications QoS Specifications UGS Unsolicited Grant Service VoIP †Maximum Sustained Rate †Maximum Latency Tolerance †Jitter Tolerance rtPS Real-Time Polling Service Streaming Audio or Video †Minimum Reserved Rate †Maximum Sustained Rate †Maximum Latency Tolerance †Traffic Priority ErtPS Extended Real-Time Polling Service Voice with Activity Detection(VoIP) †Minimum Reserved Rate †Maximum Sustained Rate †Maximum Latency Tolerance †Jitter Tolerance †Traffic Priority nrtPS Non-Real-Time Polling Service File Transfer Protocol (FTP) †Minimum Reserved Rate †Maximum Sustained Rate †Traffic Priority BE Best-Effort Service Data Transfer, Web Browsing, etc. †Maximum Sustained Rate †Traffic Priority 2008/10/23 6 Use Case 2008/10/23 7 Error Resilience Tool † Intra Placement † Parameter Sets † Flexible Macroblock Ordering † Redundant Slice † ASO † Data Partition † SP/SI Frame Add in 2008/10/23 8 Error Resilience 實驗結果[5] Encoder PSNR[dB] No error Resilience IDR PS DP FMO All tools together Y U V Encoder No errorresilience IDR PS DP FMO All tools together Output Bit Rate [kbit/s] Decoder SNR[dB] No error Resilience IDR PS DP FMO All tools together Y U V 2008/10/23 9 Error Concealment † For Frame Loss „ Frame Copy „ Motion Copy † For Slice Loss „ Intra „ Inter Exit a picture Caculate MV per MB for the frame EC start Is I slice? Using intra EC Using inter EC MV per MB > THR? Y N Using inter trial Y Using direct copy EC end N For Slice Loss [3] 2008/10/23 10 程式操作流程 2008/10/23 11 傳送方(1/3):設定接收方 IP Address 2008/10/23 12 傳送方(2/3):設定編碼參數 選取編碼視訊 設定畫面張數與畫面速率設定編碼參數 設定Error Resilience參數 2008/10/23 13 傳送方(3/3):開始編碼與傳輸 2008/10/23 14 接收方(1/5):設定本地端 IP Address 2008/10/23 15 接收方(2/5):選擇Error Concealment 2008/10/23 16 接收方(3/5):解碼視訊(資料無誤時) 2008/10/23 17 接收方(4/5)：解碼重建視訊(有封包遺 失時)，不啟動錯誤回復工具 不啟動FMO且不啟動 error concealment 不啟動FMO但啟動error concealment (frame copy) 不啟動FMO但啟動error concealment (motion copy) 2008/10/23 18 接收方(5/5)：解碼重建視訊(有封包遺 失時)，啟動錯誤回復工具 啟動FMO但不啟動error concealment 啟動FMO且啟動error concealment (frame copy) 啟動FMO且啟動error concealment (motion copy) 2008/10/23 19 未來工作 † 修改尚未完成的程式。 „ “Start Information”,“Header”,”I Frame” and “End Information” by TCP † 確定實驗比較項目。 2008/10/23 20 Reference 1. Moawad, Roukoz,St. Joseph Univ.,Mkalles,”IPTV over Wimax:Overview on the video path from the server to the Wimax end- user.”,Communications Workshop, Lebanon 2. Bo Li,Yang Qin,Chor Ping Low,Choon Lim Gwee,”A Survey on Mobile WiMAX”,Communications Magazine,IEEE,December 2007 3. Chi-Chung Tsai,Zen-Shiang Sun,Jia-Yuen Wu and Jiann-Jone Chen,”A HYBRID MACROBLOCK-BASED SPATIAL/TEMPORAL ADAPTIVE ERROR CONCEALMENT SCHEME”,2007 Computer Vision,Graphics and Image Processing Conference. 4. Sunil Kumar,Liyang Xu,Mrinal K. Mandal and Sethuraman Panchanathan,”Error Resiliency Schemes in Standard.”,Elsevier J. of Visual Communication & Image Representation(Special issue on Emerging Video Coding Standard),Vol. 17(2),April 2006 5. Jan MOCHNAC,Stanislav MARCHEVSKY,”Error Resilience Tools in the MPEG-4 and Video Coding Standards”,Radioelektronika,2008 18th International Conference 2008/10/23 21 報告結束 適用於WiMAX之視訊編解碼器 Outline 研究動機與目的 WiMAX(1/2):Introduction [2] WiMAX(2/2):QoS Service Flow [2] Use Case Error Resilience Tool Error Resilience 實驗結果[5] Error Concealment 傳送方(1/3):設定接收方 IP Address 傳送方(2/3):設定編碼參數 傳送方(3/3):開始編碼與傳輸 接收方(1/5):設定本地端 IP Address 接收方(2/5):選擇Error Concealment 接收方(3/5):解碼視訊(資料無誤時) 接收方(4/5)：解碼重建視訊(有封包遺失時)，不啟動錯誤回復工具 接收方(5/5)：解碼重建視訊(有封包遺失時)，啟動錯誤回復工具 未來工作 Reference