主观评价指标
主观评价指标
常见的两个主观评价指标:
- MOS (Mean Opinion Score):表示为一个归一化后的单一有理数,范围为1-5,其中1是最低的感知质量,5是最高的感知质量。
- MOS↑ 图像质量↑。
- DMOS (Differential Mean Quality Score):是全参考测试中”无失真”和”有失真”两者之间MOS的差异。
- DMOS↓ 图像质量↑。
待续…
测试方法
- ACR (Absolute Category Rating)
- ACR-HR (Absolute Category Rating with Hidden Reference)
- DCR (Degradation Category Rating)
- PC (Pair Comparison)
主客观映射
严格来说,主客观指标之间并不能映射,下表映射关系仅为经验总结,供参考。
PSNR | SSIM | VMAF | MOS | Quality | Describe |
---|---|---|---|---|---|
37+ | 0.93+ | 80-100 | 5 | Excellent | 极好 |
31-37 | 0.85-0.93 | 60-80 | 4 | Good | 好 |
25-31 | 0.75-0.85 | 40-60 | 3 | Fair | 一般 |
20-25 | 0.55-0.75 | 20-40 | 2 | Poor | 差 |
0-20 | 0-0.55 | 0-20 | 1 | Bad | 极差 |
References
- T-REC-P.910 : Subjective video quality assessment methods for multimedia applications https://www.itu.int/rec/T-REC-P.910-202207-I/en
- Mohamed, Samir, and Gerardo Rubino. “On the Accuracy of PSNR and PSQA Video Quality Measures.” IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDEO TECHNOLOGY, n.d., 17.
- Botia, Diego, Natalia Gaviria, J.Menedez, and David Jimenez Bermejo. An Approach to Correlation of QoE Metrics Applied to VoD Service on IPTV Using a Diffserv Network, 2012.
- VMAF:未毕之旅 - 腾讯云开发者社区-腾讯云 https://cloud.tencent.com/developer/article/1525375
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