EXFO EXpert IPTV Test Tools (FTB-200v2) - Manual (Page 63)

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Table below lists some of the perceptual quality metrics reported by VQmon/HD,
including acceptable ranges for each. (A complete list and description of the TVQM
Video Quality Metrics reported by VQmon/HD is provided in Appendix C.)
A.2.3.1 Mean Opinion Scores (MOS)
VQmon/HD reports estimated Mean Opinion Scores (MOS) for picture quality
(MOS‐V), audio quality (MOS‐A), and multimedia quality (MOS‐AV) for each
monitored video stream. MOS scores range from 1 to 5, with 1 considered
“Unacceptable” and 5 “Excellent.” MOS scores are reported as instantaneous (per‐
frame), minimum, maximum, and average values. Interval MOS scores are also
reported as instantaneous and average values.
For picture quality, VQmon/HD reports both Relative MOS‐V and Absolute MOS‐V
scores: