Evaluating experiment design with unrepeated scenes for video quality subjective assessment

The conventional video subjective test design, in which subjects view and rate multiple versions of each source video sequence, was used for decades. New technology, like adaptive streaming, makes it almost impossible to use this design since much longer sequences are needed. In this paper we examine three experiment designs: the conventional design and two alternatives that use each source sequence only once. Based on data collected by three laboratories, we compare the accuracy and scoring behavior of these three designs. We check whether there is a significant difference in scoring behavior between the experiment designs. One of the proposed experiment designs is proposed for immediate use.