Does context matter in quality evaluation of mobile television?
Proceedings of the 10th international conference on Human computer interaction with mobile devices and services
Descriptive quality of experience for mobile 3D video
Proceedings of the 6th Nordic Conference on Human-Computer Interaction: Extending Boundaries
A Hybrid Method for Quality Evaluation in the Context of Use for Mobile (3D) Television
Multimedia Tools and Applications
Investigating the influence of QoS on personal evaluation behaviour in a mobile context
Multimedia Tools and Applications
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In new mobile video applications, the subjectively perceived visual and audiovisual qualities are critical factors in the wide audience adoption of mass products. The critical factors in mobile video coding are related to low bitrates, framerates and screen size of the devices. The first part of this study examined the effects of codecs, bitrates and picture ratio on the perceived visual video quality. In the second study, effects of two audio---video bitrate ratios are presented as factors in the perceived audiovisual video quality and the results are compared to the previous study that showed the content dependency in the audio---video bitrate ratio comparisons. In the results of the visual quality study, H.264 was rated as the most satisfying, but the quality was still not enough for text legibility and perceiving important details of image due to the QCIF picture ratio. The codec XviD was in generally experienced as worse than the H.264, but with the screen size SIF-SP with XviD codec was rated better with several contents. In the audiovisual study, the results also showed that in the low total bitrates the significance of audio is increased. However, the higher and lower bitrates had similar content dependent effects.