重庆邮电大学学报(自然科学版)
重慶郵電大學學報(自然科學版)
중경유전대학학보(자연과학판)
JOURNAL OF CHONGQING UNIVERSITY OF POSTS AND TELECOMMUNICATIONS(NATURAL SCIENCE EDITION)
2009年
5期
595-598
,共4页
比特率控制%场景变化检测%巴氏距离%Cholesky分解
比特率控製%場景變化檢測%巴氏距離%Cholesky分解
비특솔공제%장경변화검측%파씨거리%Cholesky분해
Bit rate control%scene change detection%Bhattacharyya distance%Cholesky factorization
探讨了提高H.264视频编码性能的场景自适应比特率控制问题.通过计算高维空间中多模式聚集的最大特征向量距离,提出了基于巴氏距离的场景变化度量,并有效采用低秩Cholesky分解计算近似巴氏距离.在此基础上,提出了自适应的GOP结构和量化参数调整策略.实验模拟了视频样本序列.由于具有差错复原和较低的计算复杂度等特点,实验结果表明该方法十分有效.
探討瞭提高H.264視頻編碼性能的場景自適應比特率控製問題.通過計算高維空間中多模式聚集的最大特徵嚮量距離,提齣瞭基于巴氏距離的場景變化度量,併有效採用低秩Cholesky分解計算近似巴氏距離.在此基礎上,提齣瞭自適應的GOP結構和量化參數調整策略.實驗模擬瞭視頻樣本序列.由于具有差錯複原和較低的計算複雜度等特點,實驗結果錶明該方法十分有效.
탐토료제고H.264시빈편마성능적장경자괄응비특솔공제문제.통과계산고유공간중다모식취집적최대특정향량거리,제출료기우파씨거리적장경변화도량,병유효채용저질Cholesky분해계산근사파씨거리.재차기출상,제출료자괄응적GOP결구화양화삼수조정책략.실험모의료시빈양본서렬.유우구유차착복원화교저적계산복잡도등특점,실험결과표명해방법십분유효.
This paper studies scene adaptive bit rate control to improve the performance of existing H.264 video codec. By maximizing the feature vector distance between multi-modal clusters in a hyper-sphere space, a Bhattacharyya distance based metrics has been utilized to quantify the scene change. Moreover, a low rank Cholesky factorization has been adopted to compute the approximate Bhattacharyya distance quite efficiently. Then an adaptive GOP structure and quantization parameter adjustment is proposed to optimize the rate control. Video sequence in the video trace database is simulated and the experimental results demonstrate that our proposed approaches are quite effective with the characteristics of the error resilience to network packet losses and low complexity.