Absolute Category Rating (ACR) is a test method used in quality tests.P.910 : Subjective video quality assessment methods for multimedia applications. ITU-T Recommendation, approved in 1999-09. Retrieved on 2008-05-29.
The levels of the scale are, sorted by quality in decreasing order: Excellent Good Fair Poor Bad
In this method, a single test condition (generally an image or a video sequence) is presented to the viewers once only. They should then give a quality rating on an ACR scale. Test conditions should be presented in a random order per test person.
The ACR scale is evaluated based on numbers that are assigned to the individual items, where Excellent equals to 5 and Bad equals to 1. The average numeric score over all experiment participants, for each test condition that was shown, is called the mean opinion score. It may also be used for telephony voice quality to give a mean opinion score.
See also Mean opinion score Subjective video quality
References
External links Video Quality Experts Group (VQEG)