Methods of Selecting Threshold for the QoE-Based Video Output Scheme SCS

SCS is a video output scheme which is designed to maximize QoE in audio-video IP transmission; it is featured by the applicability to end-terminals independent of the type of used networks. SCS switches between video error concealment and video frame skipping by comparing the percentage of error-concealed video slices in a frame to a threshold value, which is a key parameter for successful implementation of SCS. This paper proposes two practical methods of threshold selection for SCS: a table lookup method and a user selection method. We compare the two proposed methods with the pure error concealment and the pure video frame skipping. We conducted subjective experiments on the four methods for combinations of several contents and picture patterns and then evaluated QoE in terms of the psychological scale. As a result, we observe that the table lookup method and the user selection method can achieve higher QoE than the other two conventional methods.