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EVALUATION OF SUBJECTIVE VIDEO QUALITY ON MOBILE DEVICES

Satu Jumisko-Pyykkö {@tut.fi , Tampere University of Technology}. Jukka Häkkinen {@helsinki.fi , University of Helsinki and Nokia Research}. ABSTRACT

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EVALUATION OF SUBJECTIVE VIDEO QUALITY ON MOBILE DEVICES

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  1. Satu Jumisko-Pyykkö {@tut.fi, Tampere University of Technology} Jukka Häkkinen {@helsinki.fi, University of Helsinki and Nokia Research} ABSTRACT Subjectively perceived video quality is a critical factor when adopting new mobile video applications. When video is used in mobile networks the most important requirements are related to low bitrates, framerates and the screen size of mobile device. In two tests we investigated the effects of codecs and combinations of audio and video streams with low bitrates and different contents on the perceived video quality of mobile devices. The first test showed that the codec H.264 produced the most satisfying video quality, but the quality was not high enough for the presentation of textual information. In the second test, the audio-video ratio 32/128kbps was found to be the most pleasant, but there were content dependent variations. THE VIDEO STUDY The most satisfying codec for visual quality RESEARCH METHOD Participants:75(18-65 years) stratified by age, gender, <20% professionals Test procedure Single stimulus method(ITU-R T.500-11) Contents Parameters RESULTS H.264 the most satisfying (p<0.001) In tele-text content, not difference between the codecs (p>0.05) DISCUSSION AND CONCLUSIONS H.264 produces the most satisfying quality for typical TV contents. The quality in details, e.g. text quality is needed to be improved for providing the satisfying quality. Parameters • THE AUDIO-VIDEO STUDY • The optimal audio-video bitrate ratio • RESEARCH METHOD • Participants: 60 (18-65 years) • stratified by age, gender, <20% professionals • Test procedure • Single stimulus method (ITU-R T.500-11) • Pre-test: Sensory tests, demographic survey • Test: Anchoring, training, actual test • Post-test: Content survey, interview • Contents • Potential for mobile TV, popular • Spatial and temporal resolution • Parameters • RESULTS • The highest quality score given for the ratio 32/128kbps • DISCUSSION AND CONCLUSIONS • Audio and video ratios were strongly dependant on contents. • Content dependant requirements are necessary to take into account for bandwidth optimization to deliver acceptable quality in new products such as mobile television. EVALUATION OF SUBJECTIVE VIDEO QUALITY ON MOBILE DEVICES

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