探究主观评分与感知阈值的关系，发现高分段质量评估存在模糊性。
Is there a relationship between Mean Opinion Score (MOS) and Just Noticeable Difference (JND)?
- 通过降级类别评分实验，分析MOS与JND的对应关系
- 75%用户满意点的MOS值与理论预期一致（如4.75）
- 小样本研究难以区分参考视频与JND视频的差异
评估视频感知质量对现代流媒体应用的用户体验至关重要。尽管现有主观数据集和视频质量度量（VQMs）覆盖广泛的质量范围，但许多高端应用场景需更高精度的细粒度评估。刚刚可察觉差异（JND）已成为建模高阶感知阈值的关键概念，在感知码率阶梯构建中发挥重要作用。然而，JND与更广泛应用的平均意见得分（MOS）之间的关系仍不明确。本文基于现有JND数据集开展降级类别评分（DCR）主观实验，考察MOS如何对应第一、第二阶JND的75%满意用户比率（SUR）点。结果表明，尽管各阶JND点的MOS值大致符合理论预期（如第一阶为4.75），但从MOS反推JND存在歧义，因不同感知质量等级（PVS）的置信区间重叠。统计显著性分析显示，参与者数量有限的DCR研究可能无法有效检测参考视频与JND视频间的显著差异。
原文摘要 · Abstract (English)
Evaluating perceived video quality is essential for ensuring high Quality of Experience (QoE) in modern streaming applications. While existing subjective datasets and Video Quality Metrics (VQMs) cover a broad quality range, many practical use cases especially for premium users focus on high quality scenarios requiring finer granularity. Just Noticeable Difference (JND) has emerged as a key concept for modeling perceptual thresholds in these high end regions and plays an important role in perceptual bitrate ladder construction. However, the relationship between JND and the more widely used Mean Opinion Score (MOS) remains unclear. In this paper, we conduct a Degradation Category Rating (DCR) subjective study based on an existing JND dataset to examine how MOS corresponds to the 75% Satisfied User Ratio (SUR) points of the 1st and 2nd JNDs. We find that while MOS values at JND points generally align with theoretical expectations (e.g., 4.75 for the 75% SUR of the 1st JND), the reverse mapping from MOS to JND is ambiguous due to overlapping confidence intervals across PVS indices. Statistical significance analysis further shows that DCR studies with limited participants may not detect meaningful differences between reference and JND videos.
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