In general, low and very-low bitrate video communication systems cannot achieve the full frame rate (25 Hz for PAL or 30 Hz for NSTC), which brings temporal distortion. The influence of reduced frame rate on subjective quality evaluation is a very important topic for both perceptual quality metrics and communication system optimization. In this paper, we present our work on the numerical modeling of the influence. The work includes two parts: first we measured the detectability and annoyance of periodic frame dropping's effect on perceptual visual quality evaluation under different content and frame size conditions. Then, a simple and effective feature is proposed to represent the content of video in temporal quality evaluation. The high Pearson and Spearman correlation results between the MOS and proposed model, as well as the results of other two error metrics, confirm the success of the selected temporal content-quality feature.
['Zhongkang Lu', 'Weis Lin', 'Boon Choong Seng', 'Sadaatsu Kato', 'EePing Ong', 'Susu Yao']
Perceptual Quality Evaluation on Periodic Frame-Dropping Video