【摘要】 为评价网络视频的质量,提出了一种参数规划模型.该模型结合信道和视频特性,对网络丢包引起的视频质量失真进行评价,在保证网络视频业务质量的前提下对网络进行设计和优化.首先,根据网络中的丢包行为和视频的编码特性,从序列受损和帧受损角度分析视频因丢包引起的失真,并结合丢包的概率分布推导出相应的序列损伤因子和帧损伤因子.利用这些因子预测网络视频因丢包引起的失真,并最终构建参数规划模型.实验结果表明,相比于国际标准G.1070模型和T-V模型中的视频质量评价方法,通过该模型计算得到的客观视频质量和通过主观评价得到的主观视频质量的皮尔森相关系数平均提高0.042和0.064,同时,均方根误差分别降低了0.043和0.055.更多还原

【Abstract】 To evaluate the network video quality,aparametric-planning model is presented.Combining the characteristics of the channel and video sequence,the proposed model evaluates the video distortion caused by packet loss.It can be applied to effective network design and optimization on the premise of the quality of the video services.Firstly,by a detailed analysis of the packet loss behaviors and the characteristics of the video coding,a sequence distortion factor and a frame distortion factor are derived by combining the probability distributions of the packet loss event,which can reflect the video distortion from the perspective of the sequence impairment and frame impairment.Utilizing these factors,the video distortion caused by packet loss is evaluated and finally the parametric planning model is established.Experimental results show that compared with G.1070 and T-V models,the proposed model gets an increment of about 0.042and0.064 in Pearson Correlation Coefficient(PCC)and a decrement of about 0.043 and 0.055 in Root Mean Squared Error(RMSE).更多还原