Influence of camera and in-scene motion on perceived video quality in MPEG-2 adaptive coding

Abstract

This paper describes an experiment that studies perceived video quality, with the goal to get a better understanding of whether a temporal or a spatial MPEG-2 based adaptation method should be used for video transmission over variable bandwidth. The research focused on the relation between in-scene motion and camera motion on spatial as well as temporal distortions in video sequences. Participants were tested on their sensitivity and appreciation for spatial and temporal distortions using the scale paradigm of direct comparison. Footage was shot to create video material of three scenes with a systematic manipulation of in-scene motion and camera motion, which produced twelve different video sequences. Results show a relation trend between the two types of motion and the two types of distortion in video sequences. The main result indicates that participants generally rated spatial distortions as better video quality than the same video sequence containing temporal distortions; even though video sequences containing spatial distortions were coded at an overall lower bitrate than video sequences containing temporal distortions.