Absolute Category Rating


Absolute Category Rating (ACR) is a test method used in quality tests.[1][2]

A five-level scale for rating quality.

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.

The ACR scale is also used for telephony voice quality to give a mean opinion score.

See alsoEdit


  1. ^ P.910 : Subjective video quality assessment methods for multimedia applications. ITU-T Recommendation, approved in 1999-09. Retrieved on 2008-05-29.
  2. ^ tsbmail. "P.800 : Methods for subjective determination of transmission quality". www.itu.int. Retrieved 2017-02-01.

External linksEdit

  • Video Quality Experts Group (VQEG)