| 视频Internet传输的率失真优化运动估计算法 |
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| 引用本文： | 杨静,方向忠.视频Internet传输的率失真优化运动估计算法[J].计算机工程,2008,34(8):246-248. |
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| 作者姓名： | 杨静 方向忠 |
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| 作者单位： | 1. 上海海事大学信息工程学院,上海,200135
2. 上海交通大学图像通信与信息处理研究所,上海,200240 |
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| 基金项目： | 国家高技术研究发展计划(863计划) |
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| 摘 要： | 通过对端到端失真的成因进行分析，研究运动矢量的选择对误码扩散大小的影响。针对传统运动估计算法只考虑信源端的情况，提出一种基于端到端预测误差的计算方法并据此对运动矢量进行率失真优化选择。基于H.264编码平台的仿真试验表明，采用所提出的率失真优化运动估计算法可以进一步提高在Internet误码条件下的低码率视频流鲁棒性及解码质量。
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| 关 键 词： | 率失真优化 运动估计 低码率 互联网 |
| 文章编号： | 1000-3428(2008)08-0246-03 |
| 修稿时间： | 2007年4月6日 |
Rate-distortion Optimized Motion Estimation Algorithm for Video Transmission over Internet |
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| YANG Jing,FANG Xiang-zhong.Rate-distortion Optimized Motion Estimation Algorithm for Video Transmission over Internet[J].Computer Engineering,2008,34(8):246-248. |
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| Authors: | YANG Jing FANG Xiang-zhong |
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| Affiliation: | (1. College of Information Engineering, Shanghai Maritime University, Shanghai 200135; 2. Institute of Image Comm. & Info. Processing, Shanghai Jiaotong University, Shanghai 200240) |
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| Abstract: | By analyzing the end-to-end distortion, the influence of motion vector selection on error propagation is studied. Allowing for that traditional motion estimation algorithm only takes into account the prediction error within source encoding framework, which is no longer accurate in lossy environment, an end-to-end prediction error calculation method is proposed. This prediction error is used in the rate-distortion optimized selection of motion vectors. Simulations have been done based on H.264 standard. The results show that for low-bit-rate video transmission over Internet, the robustness of video stream and the decoded video quality are improved by appling the proposed algorithm. |
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| Keywords: | rate-distortion optimization motion estimation low-bit-rate Internet |
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