基于HTTP自適應(yīng)流媒體的質(zhì)量評估
[Abstract]:With the development of network technology and multimedia technology, experience video service through the Internet has become a popular trend. The dynamic adaptive streaming media (DASH) technology based on HTTP has become the mainstream technology of video on demand by its characteristics such as reliability, self-adaptation, simple realization and so on. However, there is no mature quality assessment method for the events that affect user experience, such as video buffering and video quality fluctuation, which may occur in DASH system. This paper focuses on the impact of buffering and quality fluctuation events on the user's subjective experience during video playback, and establishes an objective evaluation model for the impact of buffered and quality fluctuating events on the quality of DASH video. In this paper, we first study the effect of video buffering events on the quality of DASH video. According to the characteristics of the buffered event, it is divided into two phases: the buffering phase and the recovery phase, and the factors that affect the video quality of each phase are determined, respectively. The influence factors of the buffer phase include the video perception quality at the start time and the length of the buffer time, while the influence factors for the recovery phase are the video perception quality at the start time, the recovery time and the video coding quality at the recovery stage. Then set up the corresponding subjective experiment to test the mapping relationship between each influencing factor and video quality. Finally, the objective evaluation model of video quality in each stage is established according to the experimental results. The influence of video quality fluctuation events on DASH video quality is also studied in this paper. A single quality fluctuation event is also divided into two stages: the quality fluctuation stage and the quality stabilization stage. In the quality fluctuation stage, the factors that affect the video quality are the video perceived quality and the quality fluctuation level at the start time. The influence factors of the stationary stage are the video perceptual quality at the start time, the length of the stationary stage and the video coding quality at the stationary stage. According to the different influencing factors in different stages, the corresponding subjective experiments are designed and tested. According to the experimental results, the relationship between each factor and video quality is determined, and a two-stage model for the fluctuation of video quality is established. The user's subjective experience in each buffer or quality fluctuation event is affected by the previous event, and the user's subjective experience at a given time is the result of multiple events accumulated prior to this moment. It is also necessary to consider the effects of multiple events in practical application scenarios. Therefore, on the basis of a video buffering event model and a video quality fluctuation event model, this paper also extends the two sets of models to multiple buffer events and multiple video quality fluctuation events, respectively. The results of performance verification experiments show that the objective model of video buffering and video quality fluctuation established in this paper has good performance and can accurately reflect the experience quality of DASH video.
【學(xué)位授予單位】:西安電子科技大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2014
【分類號】:TN919.81
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