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Vranješ Mario Rimac-Drlje Snježana Vranješ Denis 《Multimedia Tools and Applications》2018,77(16):21053-21082
Multimedia Tools and Applications - When the video is compressed and transmitted over heterogeneous networks, it is necessary to ensure the satisfying quality for the end user. Since human... 相似文献
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Mario Vranješ Snježana Rimac-Drlje Krešimir Grgić 《Signal Processing: Image Communication》2013,28(1):1-19
The use of video-based applications has increased in recent years owing to the development of video technology as well as the widespread use of the Internet. Thus the evaluation of perceptual video quality has become very important and numerous video quality assessment (VQA) metrics have been developed over the past years. In this paper, we give a classification and a short review of objective VQA metrics, with a focus on the full reference metrics. With the aim of conducting a reliable test of the VQA metrics performances, we made two databases, each of them including 90 distorted video sequences. We carried out a subjective quality evaluation on these databases and the data were made available to the research community. Furthermore, we compared the performance of nine different, freely available, objective VQA metrics by using three different databases in different resolutions: LIVE Video Quality Database (768×432 resolution) and our two newly created databases for progressively scanned videos, i.e. ETFOS CIF Video Quality (ECVQ) database and ETFOS VGA Video Quality (EVVQ) database. Five different distortion types were used and the total number of 330 video sequences was evaluated. A comparison of metrics was done with respect to accuracy, monotonicity, stability, as well as complexity vs. accuracy criteria. The results show that the resolution, the content of the sequence and the distortion type have a significant influence on the performances of VQA metrics. Metrics that generally achieve a high correlation with subjective results for all databases and all distortion types are MOtion-based Video Integrity Evaluation (MOVIE) and Foveated Mean Squared Error (FMSE), but MOVIE has significantly higher complexity than FMSE. An exception is the distortion caused by IP transmission for which none of the analyzed metrics has shown satisfying accuracy and stability. 相似文献
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Snježana Rimac-Drlje Mario Vranješ Drago Žagar 《Multimedia Tools and Applications》2010,49(3):425-445
Efficiency of a video coding process, as well as accuracy of an objective video quality evaluation can be significantly improved
by introduction of the human visual system (HVS) characteristics. In this paper we analyze one of these characteristics; namely,
visual acuity reduction due to the foveated vision and object movements in a video sequence. We propose a new video quality
metric called Foveated Mean Squared Error (FMSE) that takes into account a variable resolution of the HVS across the visual field. The highest visual acuity is at the point
of fixation that falls into fovea, an area at retina with the highest density of photoreceptors. Visual acuity decreases rapidly
for image regions which are further with respect to the fixation point. FMSE also utilizes the effect of additional spatial acuity reduction due to motion in a video sequence. The quality measures calculated
by FMSE have shown a high correlation with experimental results obtained by subjective video quality assessment. 相似文献
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