计算机工程与应用
計算機工程與應用
계산궤공정여응용
COMPUTER ENGINEERING AND APPLICATIONS
2014年
5期
11-15
,共5页
错误掩盖%场景检测%失真度估计%H.264/AVC
錯誤掩蓋%場景檢測%失真度估計%H.264/AVC
착오엄개%장경검측%실진도고계%H.264/AVC
error concealment%scene change detection%distortion estimation%H.264/AVC
为了减小视频传输中的错误对解码端重建视频质量的影响,提出了一种基于场景检测的自适应Intra帧差错掩盖算法。该算法利用H.264/AVC的帧内预测模式分布差异检测Intra帧的场景切换,对非场景切换的Intra帧进行空时域掩盖的失真度估算,在此基础上进行自适应的空时域掩盖。实验结果表明,该算法充分利用了Intra帧的时域相关性,与已有的Intra帧差错掩盖算法比较,该算法恢复的视频序列平均峰值信噪比提高了1~2 dB,具有更好的差错掩盖效果。
為瞭減小視頻傳輸中的錯誤對解碼耑重建視頻質量的影響,提齣瞭一種基于場景檢測的自適應Intra幀差錯掩蓋算法。該算法利用H.264/AVC的幀內預測模式分佈差異檢測Intra幀的場景切換,對非場景切換的Intra幀進行空時域掩蓋的失真度估算,在此基礎上進行自適應的空時域掩蓋。實驗結果錶明,該算法充分利用瞭Intra幀的時域相關性,與已有的Intra幀差錯掩蓋算法比較,該算法恢複的視頻序列平均峰值信譟比提高瞭1~2 dB,具有更好的差錯掩蓋效果。
위료감소시빈전수중적착오대해마단중건시빈질량적영향,제출료일충기우장경검측적자괄응Intra정차착엄개산법。해산법이용H.264/AVC적정내예측모식분포차이검측Intra정적장경절환,대비장경절환적Intra정진행공시역엄개적실진도고산,재차기출상진행자괄응적공시역엄개。실험결과표명,해산법충분이용료Intra정적시역상관성,여이유적Intra정차착엄개산법비교,해산법회복적시빈서렬평균봉치신조비제고료1~2 dB,구유경호적차착엄개효과。
In order to reduce the influence of transmission errors on the reconstructed image quality in decoder, a novel adaptive error concealment algorithm based on scene change detection for intra frames of H.264/AVC is proposed. The distribution difference of intra prediction mode for H.264/AVC is used to detect scene change. Then distortion estimation is carried out for these intra frames not happened at the moment of scene change. Finally, combined with distortion estima-tion, the new method adaptively selects the spatial-temporal error concealment schemes. Simulation results show that the presented algorithm can use the high correlation of adjacent frames sequence and effectively suppresses error propagation. Compared with other conventional methods, the proposed algorithm can achieve 1~2 dB gain in terms of average PSNR and provides much better error concealment results.