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The use of adaptive-bitrate-streaming services over networks has been increasing in recent years. The quality of adaptive-bitrate-streaming services is primarily affected by the video resolution, the audio and video bitrate, bitrate adaptation, stalling due to a lack of playout buffer, and the content length. Therefore, service providers should monitor quality in real time to confirm the normality...
Video quality improvement plays an important quality of experience (QoE) role in video application. In recent video distributions on the Internet, bitrate is changed automatically by using HTTP adaptive streaming (HAS). Bitrate change often depends on Internet bandwidth, display size, and memory buffer. In each bitrate, resolutions and frame rates can be selected freely. However, it is difficult to...
Significant progress has been made in the recent years in the development of technologies for encoders, decoders and networks. As a result, content, network, and Internet service providers can deliver video content over IP networks. To provide a high-quality service, the quality of experience (QoE) is becoming much more important. Since QoE is affected by such factors as the audiovisual content, encoding...
Multi-view coding is expected to be used in next-generation encoders and decoders for stereoscopic video services. In multi-view coding, the bit rate for the right eye view is lower than that for the left eye view because the right view is encoded using inter-view technology. In addition, the right view is encoded at a much lower bit rate on the basis of binocular suppression. As a result, the video...
Many subjective assessment methods for video quality have been standardized. Although the performance of individual subjective assessment methods of 2D video quality has been studied to compare their stability, the performance per subjective assessment method for stereoscopic 3D video quality has not been sufficiently studied. To compare this performance, we conducted subjective quality assessments...
Stereoscopic high definition video is one of the promising next-generation video services because 3D video can express more life-like visual experiences. 3D video quality of experience is affected by the employed codec and video format. Therefore, we conducted extensive subjective assessments for side-by-side and frame-sequential video sequences using different codecs. In this paper, we first show...
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