基于感兴趣区的MPEG-4FGS增强层码率分配算法  

ROI-Based Rate Allocation Algorithm for MPEG-4 FGS

作　　者：陈强[1] 卓力[1] 沈兰荪[1] 

机构地区：[1]北京工业大学信号与信息处理研究室,北京100022

出　　处：《电子与信息学报》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

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.

关 键 词：MPEG-4 FGS 选择性增强 感兴趣区 率失真模型 码率分配 

分 类 号：TN919.8[电子电信—通信与信息系统]