High-bandwidth video conferencing systems: When is the quality worth the cost?
msra
摘要
The marketing literature for videoconferencing products often makes recommendations for settings that will yield acceptable subjective video quality; however, these recommendations have not been empirically validated. Additionally, a number of high bandwidth conferencing systems have been created that promise high video quality, but with extremely high bandwidth costs. An experiment was conducted investigating the subjective perception of video quality under the following conditions: 384 kbps, 1920 kbps, DVTS, and plain video. Four test scenes were used that differed in the amount and type of motion present in the video. Participants viewed sequences of reference and test scenes on a Samsung 42-inch plasma display, and made subjective ratings of all scenes using a discrete, 5-point scale. 1920 kbps scenes were given higher ratings than 384 kbps, but lower than both DVTS and a control. Ratings were also lower for scenes with more motion present in the video. No statistically significant difference was found between the DVTS and control test scenes. These findings suggest that while low bandwidth video may be acceptable for "talking heads"-type scene composition, medium bandwidth video offers a higher quality experience for users. Even higher bandwidth systems improve quality more, with the most dramatic improvements coming in scenes with high levels of motion.
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关键词
subjective assessment,video quality,videoconferencing.
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