No-reference Quality Assessment of Panoramic Video based on Spherical-domain Features

As one of the most important parts of virtual reality applications, panoramic video has become very popular. Differing from the traditional plane video, panoramic video is projected onto the 2D plane for processing, while viewed in the spherical domain. Quality of the projected plane cannot represent the real visual quality in VR viewing. In this paper, a no-reference (NR) quality assessment method is proposed for panoramic video. The proposed method extracts spatial and temporal video features from spherical domain to better model the perceived visual quality, alleviating the influence of non-uniform projection. Experiments conducted on a subjective quality database for panoramic video show that the proposed method can achieve better performance compared with the NR method designed for traditional 2D video.