Hybrid Distortion Ranking Tuned Bitstream-Layer Video Quality Assessment
No-reference bitstream-layer video quality assessment is very important and practical for monitoring the perceptual experience of end users and facilitating network maintenance. For pervasive Internet Protocol Television and mobile streaming services, in addition to quality degradation due to lossy compression, the unreliable transmission mechanism (i.e., User Datagram Protocol/IP) often leads to quality degradation due to packet loss. Different technical solutions bring in different types of visual artifacts. In this paper, we proposed a hybrid distortion ranking (HDR)-based bitstream-layer quality assessment model, whose artifact combination framework is based on the ranked linear combination operation. The model can predict the perceived quality of a video with sufficient accuracy when the video is distorted by compression artifacts, slicing artifacts, freezing (with frame skipping) artifacts, or their combinations. The core algorithms of the model were adopted into ITU-T Recommendations, P.1202.1 and P.1202.2. Furthermore, with respect to the three different types of artifacts, we compared the proposed no-reference HDR model with some state-of-the-art full-reference perceptual quality assessment models including Video Quality Model (i.e., ITU-T Rec. J.144), structural similarity (SSIM), multiscale SSIM, visual information fidelity, and the widely used metric, peak signal-to-noise ratio. We also compared our HDR model with the top performing no-reference models including Blind/Referenceless Image Spatial Quality Evaluator and video Blind Prediction of Natural Video Quality. The experiment results demonstrate the efficiency of our HDR model.