铜仁学院学报
銅仁學院學報
동인학원학보
JOURNAL OF TONGREN UNIVERSITY
2014年
4期
71-75
,共5页
Ad hoc网络%多描述编码%多路径%抗误码性
Ad hoc網絡%多描述編碼%多路徑%抗誤碼性
Ad hoc망락%다묘술편마%다로경%항오마성
Ad hoc network%multiple description coding%multiple routing%error resilient
为增强无线多跳网络（Ad hoc网络）中视频传输的抗误码性能，提出了一种面向Ad hoc网络的视频多描述编码及其传输方法。首先，通过判断两个相邻帧运动矢量的差值，自适应地在视频序列中插入参考帧以提高帧间编码效率；然后分别抽取出视频序列中的奇数帧和偶数帧形成两个描述；最后，在确保传输路径可靠性的基础上，选取两个质量较高的节点不相交路径分别传输视频序列的两个描述，以提高视频传输的可靠性。OPNET Modeler中的仿真实验结果表明，与目前Ad hoc网络中典型的多描述编码及传输方法MDC_AODV相比，本文提出的方法有效地增强了视频传输的抗误码性，提高了接收端的视频质量。
為增彊無線多跳網絡（Ad hoc網絡）中視頻傳輸的抗誤碼性能，提齣瞭一種麵嚮Ad hoc網絡的視頻多描述編碼及其傳輸方法。首先，通過判斷兩箇相鄰幀運動矢量的差值，自適應地在視頻序列中插入參攷幀以提高幀間編碼效率；然後分彆抽取齣視頻序列中的奇數幀和偶數幀形成兩箇描述；最後，在確保傳輸路徑可靠性的基礎上，選取兩箇質量較高的節點不相交路徑分彆傳輸視頻序列的兩箇描述，以提高視頻傳輸的可靠性。OPNET Modeler中的倣真實驗結果錶明，與目前Ad hoc網絡中典型的多描述編碼及傳輸方法MDC_AODV相比，本文提齣的方法有效地增彊瞭視頻傳輸的抗誤碼性，提高瞭接收耑的視頻質量。
위증강무선다도망락（Ad hoc망락）중시빈전수적항오마성능，제출료일충면향Ad hoc망락적시빈다묘술편마급기전수방법。수선，통과판단량개상린정운동시량적차치，자괄응지재시빈서렬중삽입삼고정이제고정간편마효솔；연후분별추취출시빈서렬중적기수정화우수정형성량개묘술；최후，재학보전수로경가고성적기출상，선취량개질량교고적절점불상교로경분별전수시빈서렬적량개묘술，이제고시빈전수적가고성。OPNET Modeler중적방진실험결과표명，여목전Ad hoc망락중전형적다묘술편마급전수방법MDC_AODV상비，본문제출적방법유효지증강료시빈전수적항오마성，제고료접수단적시빈질량。
The multiple description video coding and video transmission scheme in Ad hoc network is presented in this paper in order to improve the quality of video and enhanced error resilience of video transmission. To improve the inter-coding efficiency, one or more reference frames were added between two adjacent frames by determining the magnitude of the difference of motion vectors of adjacent frames. Then the odd frame and the even frame were extracted from the video sequence and formed two descriptions respectively. On the basis of maximum reliability of routes, two descriptions of video frequency were transmitted to two disjoint routes respectively, which can increase the robustness of video transmission. The simulation on OPNET Modeler shows that the error resilience of video transmission has been improved and the video quality has been enhanced compared with MDC_AODV.
