Hur upplevd videokvalitet påverkas av upplösning och bitrate

Sammanfattning: Streaming is currently the main method used to watch videos, and with this a significant portion of all Internet traffic is occupied by streaming. In order to efficiently store and transfer this large quantity of data, compression is necessary for the streaming services. This compression causes loss of information, which could have detrimental effects on the experienced quality of the video. In this study, in order to examine how quality of video is experienced, 14 participants were asked to grade the visual quality of several clips of two different scenes. The varying factors within the clips were set to two different parameters: bitrate, and image resolution. Two different types of scenes were examined: one being still, and the other being more dynamic with plenty of movement and cuts within the scene. Depending on the scene, the two different parameters were shown to have different impacts on the perceived image quality of the clips. The video clips with higher resolution performed better during still scenes, while bitrate contributed more to the perceived quality during dynamic scenes. The compression method that was used proved to be rather effective at compressing the data with relatively small losses in experienced image quality, which was true for both scenes.