Acceptance Threshold: A Bidimensional Research Method for User-Oriented Quality Evaluation Studies

Table 1

Overview to overall quality evaluation methods.

Method	ACR	QoP	Method of limit
Presentation	Single stimulus, Independently	Single stimulus, Independently	Continuous, gradually decreasing or increasing the intensity of the stimulus
Duration of stimuli	≤10 s	App. 30 s	210 s, quality changes every 30 s
Scales	5/9/11-point scales, MOS	Satisfaction (0–5) Enjoyment Objective quality Information assimilation: ratio of right answers	Binary acceptable/unacceptable
Applied	Audio-video bitrates, codecs, resolution, packet loss [8, 19, 20, 22, 23, 47]	Framerate, delay, jitter, devices, [12, 13, 17]	Framerate, quantization, audio-video bitrate, resolution, text quality, [9, 10, 14, 25, 48]