摘要
该文提出了一种基于感兴趣区的MPEG-4 FGS增强层码率分配算法。该算法在建立一种针对感兴趣区的率失真模型的基础上,在等质量的约束条件下,可以实现选择性增强后FGS增强层码率的优化分配。实验结果表明,与平均码率分配算法相比,该算法可以显著降低视频图像中人眼感兴趣区域重建质量的波动。同时,该算法的计算复杂度低,完全能满足视频服务器实时码率分配的要求。
A ROI-based rate allocation algorithm for the MPEG-4 FGS enhancement layer is proposed in this paper. On the basis of the ROI-oriented rate-distortion model, the proposed algorithm can perform optimal rate allocation for the enhancement layer after selective enhancement under equal image quality constraint. The experimental results show that, compared with the conventional average rate allocation algorithm, the proposed algorithm can significantly eliminate the quality fluctuation of ROI. Simultaneously, the computational complexity of the proposed method is low enough to meet the requirements of the real time rate allocation at the video server.
出处
《电子与信息学报》
EI
CSCD
北大核心
2005年第3期402-406,共5页
Journal of Electronics & Information Technology
基金
国家自然科学基金(90304001)北京自然科学基金(40520007
4032008)北京市教委项目(KM200410005022)资助课题
关键词
MPEG-4
FGS
选择性增强
感兴趣区
率失真模型
码率分配
MPEG-4 FGS, Selective enhancement, Region Of Interest (ROI), Rate-distortion model, Rate allocation
