Motion estimation is an important part of H.264/AVC encoding progress, with high com- putational complexity. Therefore, it is quite necessary to find a fast motion estimation algorithm for real-time applications. The ...Motion estimation is an important part of H.264/AVC encoding progress, with high com- putational complexity. Therefore, it is quite necessary to find a fast motion estimation algorithm for real-time applications. The algorithm proposed in this letter adjudges the macroblocks activity degree first; then classifies different video sequences, and applies different search strategies according to the result. Experiments show that this method obtains almost the same video quality with the Full Search (FS) algorithm but with reduced more than 95% computation cost.展开更多
分析了通用数据传输服务质量(quality of service,QoS)技术,探讨了实时传输及实时传输控制协议(real-time transport protocol/real-time transport control protocol,RTP/RTCP)、H.264分层编码与码率控制、信道自适应的传输等相关技术...分析了通用数据传输服务质量(quality of service,QoS)技术,探讨了实时传输及实时传输控制协议(real-time transport protocol/real-time transport control protocol,RTP/RTCP)、H.264分层编码与码率控制、信道自适应的传输等相关技术在跨层视频传输过程的作用,指出自适应多速率(adaptive multirate auto rate fallback,AMARF)协议的缺陷,提出改进的E-AMARF(Extend-AMARF)协议并进行仿真实验,基于以上技术提出一种跨层视频传输QoS控制策略,并将其应用于本团队自主研发的无线局域网可视电话(WLAN video phone,WVphone)终端上。仿真实验表明,在节点数目不多时,E-AMARF协议相较AMARF协议具有明显的优越性。WVphone终端测试结果显示,添加QoS保障后,WVphone具有实时、高清的效果,说明本跨层视频传输QoS控制策略是有效的。展开更多
文摘Motion estimation is an important part of H.264/AVC encoding progress, with high com- putational complexity. Therefore, it is quite necessary to find a fast motion estimation algorithm for real-time applications. The algorithm proposed in this letter adjudges the macroblocks activity degree first; then classifies different video sequences, and applies different search strategies according to the result. Experiments show that this method obtains almost the same video quality with the Full Search (FS) algorithm but with reduced more than 95% computation cost.
文摘分析了通用数据传输服务质量(quality of service,QoS)技术,探讨了实时传输及实时传输控制协议(real-time transport protocol/real-time transport control protocol,RTP/RTCP)、H.264分层编码与码率控制、信道自适应的传输等相关技术在跨层视频传输过程的作用,指出自适应多速率(adaptive multirate auto rate fallback,AMARF)协议的缺陷,提出改进的E-AMARF(Extend-AMARF)协议并进行仿真实验,基于以上技术提出一种跨层视频传输QoS控制策略,并将其应用于本团队自主研发的无线局域网可视电话(WLAN video phone,WVphone)终端上。仿真实验表明,在节点数目不多时,E-AMARF协议相较AMARF协议具有明显的优越性。WVphone终端测试结果显示,添加QoS保障后,WVphone具有实时、高清的效果,说明本跨层视频传输QoS控制策略是有效的。