Contents I. Introduction
With the development of technologies such as multimedia and mobile networks, recent years have witnessed the explosion of UGC and related services. UGC videos created by end users have several unique characteristics. First, the lack of professional video capture equipment and proper shooting skills make the quality of UGC videos perceptually worse, which has been widely criticized by end-users. Second, the low barriers in video production make the UGC content extremely diverse, and special effects are often incorporated to enhance the user experience. Third, after being uploaded to the sharing platform, they often undergo another round of compression depending on the requirements of the hosting platform. As such, the artifacts from multiple rounds of distortion stages are induced, while pristine videos are absent in the hosting platform. Nevertheless, in the literature, the progress on UGC video quality assessment is quite limited, and the traditional VQA measures may not accommodate these distinct properties.
