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The difference between perceived video quality and objective video quality

机译：感知视频质量和客观视频质量之间的差异

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We select 93 video sequences encoded/decoded by Microsoft MPEG-4 software to classify them into six different content characteristics by the cluster analysis and the discriminant analysis in this study. We compare the peak signal noise ratio (PSNR) of objective video quality evaluation with the mean opinion score of subjective quality evaluation to understand their difference by varying different bit rate. We find that the acceptable satisfaction of user perceived quality for different motion and texture characteristics is significantly different in varying the bit rates. For the low motion and simple texture characteristic (Type 1) and the low motion and complex texture characteristic (Type 4), when the bit rate is 2,000 kbps, the tolerable discarded ratio is allowed to 44% and 49%, and the PSNR is 41.7 dB and 41.0 dB, subjects could perceive the acceptable satisfaction of video quality. For the middle motion and simple texture characteristic (Type 2) and the high motion and simple texture characteristic (Type 3), when the bit rate needs around 3,000 kbps, the tolerable discarded ratio must be controlled below 12% and 34%, and the PSNR is 45.2 dB and 41.7 dB, subjects could perceive the acceptable satisfaction of video quality. For the middle motion and complex texture characteristic (Type 5) and the high motion and complex texture characteristic (Type 6), when the bit rate is 6,000 kbps, the tolerable discarded ratio is allowed to 14%, and the PSNR is 43.2 dB and 42.9 dB, subjects could perceive the acceptable satisfaction of video quality.
机译：我们通过聚类分析和判别分析，选择了由Microsoft MPEG-4软件编码/解码的93个视频序列，将它们分类为六个不同的内容特征。我们将客观视频质量评估的峰值信号噪声比（PSNR）与主观质量评估的平均意见得分进行比较，以通过改变不同的比特率来了解它们的差异。我们发现，对于不同的运动和纹理特征，用户感知质量的可接受满意度在改变比特率方面存在显着差异。对于低速运动和简单纹理特征（类型1）和低速运动和复杂纹理特征（类型4），当比特率为2,000 kbps时，允许的丢弃率分别为44％和49％，PSNR为41.7 dB和41.0 dB，对象可以感觉到视频质量的可接受满意度。对于中间运动和简单纹理特征（类型2）以及高速运动和简单纹理特征（类型3），当比特率需要3,000 kbps左右时，必须将可容忍的丢弃率控制在12％和34％以下，并且PSNR分别为45.2 dB和41.7 dB，被摄对象可以感觉到可接受的视频质量满意度。对于中速运动和复杂纹理特征（类型5）以及高运动和复杂纹理特征（类型6），当比特率为6,000 kbps时，允许的舍弃率为14％，PSNR为43.2 dB，并且42.9 dB，对象可以感觉到视频质量的可接受的满意度。

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