Mean opinion score
Mean opinion score (MOS) is a measure used in the domain of Quality of Experience and telecommunications engineering, representing overall quality of a stimulus or system. It is the arithmetic mean over all individual “values on a predefined scale that a subject assigns to his opinion of the performance of a system quality”. Such ratings are usually gathered in a subjective quality evaluation test, but they can also be algorithmically estimated.
MOS is a commonly used measure for video, audio, and audiovisual quality evaluation, but not restricted to those modalities. ITU-T has defined several ways of referring to a MOS in Recommendation P.800.1, depending on whether the score was obtained from audiovisual, conversational, listening, talking, or video quality tests.
Rating scales and mathematical definition
The MOS is expressed as a single rational number, typically in the range 1–5, where 1 is lowest perceived quality, and 5 is the highest perceived quality. Other MOS ranges are also possible, depending on the rating scale that has been used in the underlying test. The Absolute Category Rating scale is very commonly used, which maps ratings between Bad and Excellent to numbers between 1 and 5, as seen in below table.
Other standardized quality rating scales exist in ITU-T recommendations (such as P.800 or P.910). For example, one could use a continuous scale ranging between 1–100. Which scale is used depends on the purpose of the test. In certain contexts there are no statistically significant differences between ratings for the same stimuli when they are obtained using different scales.
Where are the individual ratings for a given stimulus by subjects.
Properties of the MOS
The MOS is subject to certain mathematical properties and biases.
When the MOS is acquired using a categorical rating scales, it is based on – similar to Likert scales – an ordinal scale. In this case, the ranking of the scale items is known, but their interval is not. Therefore, it is mathematically incorrect to calculate a mean over individual ratings in order to obtain the central tendency; the median should be used instead. However, in practice and in the definition of MOS, it is considered acceptable to calculate the arithmetic mean.
It has been shown that for categorical rating scales (such as ACR), the individual items are not perceived equidistant by subjects. For example, there may be a larger “gap” between Good and Fair than there is between Good and Excellent. The perceived distance also depends on the language into which the scale is translated.
Several other biases are present in the way MOS ratings are typically acquired. In addition to the above-mentioned issues with scales that are perceived non-linearly, there is a so-called “range-equalization bias”: subjects, over the course of a subjective experiment, tend to give scores that span the entire rating scale. This makes it impossible to compare two different subjective tests if the range of presented quality differs. In other words, the MOS is never an absolute measure of quality, but only relative to the test in which it has been acquired.
For the above reasons – and due to several other contextual factors influencing the perceived quality in a subjective test –, a MOS value should only be reported if the context in which the values have been collected in is known and reported as well. MOS values gathered from different contexts and test designs therefore should not be directly compared. ITU-T Recommendation P.800.2 prescribes how MOS values should be reported. Specifically, P.800.2 says:
it is not meaningful to directly compare MOS values produced from separate experiments, unless those experiments were explicitly designed to be compared, and even then the data should be statistically analysed to ensure that such a comparison is valid.
MOS for speech and audio quality estimation
MOS historically originates from subjective measurements where listeners would sit in a "quiet room" and score a telephone call quality as they perceived it. This kind of test methodology had been in use in the telephony industry for decades and was standardized in ITU-T recommendation P.800. It specifies that “the talker should be seated in a quiet room with volume between 30 and 120 dB and a reverberation time less than 500 ms (preferably in the range 200–300 ms). The room noise level must be below 30 dBA with no dominant peaks in the spectrum.” Requirements for other modalities were similarly specified in ITU recommendations later.
MOS estimation using quality models
Obtaining MOS ratings may be time-consuming and expensive as it requires the recruitment of human assessors. For various use cases such as codec development or service quality monitoring purposes – where quality should be estimated repeatedly and automatically – MOS scores can also be predicted by objective quality models, which typically have been developed and trained using human MOS ratings.
- Absolute Category Rating
- Likert scale
- MUSHRA (ITU-R Recommendation BS.1534)
- Objective video quality
- Subjective video quality
- ITU-T Rec. P.10 (2006) Vocabulary for performance and quality of service.
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- Streijl, Robert C., Stefan Winkler, and David S. Hands. "Mean opinion score (MOS) revisited: methods and applications, limitations and alternatives." Multimedia Systems 22.2 (2016): 213-227.
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