Stabilizing viewing distances in subjective assessment of mobile video

Abstract

The perceptual quality of mobile video is affected by many factors, including codec selection, compression rate, network performance and device characteristics. Given the options associated with generating and transmitting mobile video, there is an industry requirement for video quality measurement tools to ensure that the best achievable quality is delivered to customers. International standards bodies are now considering alternative multimedia perceptual quality methods for mobile video. In order to fairly evaluate the performance of objective perceptual quality metrics, it is important that the subjective testing provides stable and reliable subjective data. This paper describes subjective studies examining the effect of viewing distance in subjective quality assessment of low resolution video.

Modelling of spatio–temporal interaction for video quality assessment

“…The chosen viewing distance follows the guidelines set-up by VQEG [24] as well as ITU-T Recommendation P.910 [19]. Brotherton et al examined the effect of viewing distance in subjective quality assessment of low-resolution video [25]. In their study, two laboratories conducted two experiments with QCIF videos and one with CIF videos.…”

Visual experience of quality degradation when viewing computer and notebook displays from an oblique angle

“…Based on this and results from a study that specifically looked at the impact on video quality whether the head movements where controlled or not, which concluded that it did not affect the result in a significant way, see Ref. 13. The head-and-chin rest was not used in this part of the test.…”