A comparison of subjective picture quality evaluation methods for different television systems

This paper describes a comparison of two methods that evaluate picture qual ity in different television systems. One presents a pair of test sequences simultaneously on two identical HDTV monitors and the other presents them s uccessively on a single monitor. New viewing conditions modifying the conve ntional ones for a single monitor are proposed then, sensitivity to impairm ents in the test using two monitors is compared with that using a single mo nitor. The method using two monitors has merits and drawbacks, therefore, a new method containing the advantages of both methods is proposed and its v alidity is verified. In addition, it is clear that in the paired comparison (PC), the way in which a pair of sequences is presented may affect the ass essors' opinion scores; therefore, they should be presented twice in the re verse order or in the opposite position.