Department of Psychology, Rice University, 6100 Main Street MS 25, Houston, TX 77005, USA.
Hum Factors. 2010 Feb;52(1):105-18. doi: 10.1177/0018720810366020.
The purpose of this study was to examine the impact of the desirability of content on viewers' ratings of subjective video quality.
Most subjective video quality studies use short-duration clips that are specially designed to exercise the encoding algorithms and do not consider the desirability of the content as a variable.
In four studies, we employed a total of 100 participants and 180 movie clips encoded at nine levels from 550 kbps up to DVD quality. Participants viewed clips that were 2 min in length and then were asked about video quality of the clips and desirability of the movie content.
The results of these studies show that there is a strong correlation between the desirability of movie content and subjective ratings of video quality. This strong relationship holds across a wide range of encoding levels and movie content when that content is viewed under longer, more naturalistic viewing conditions.
The effects of content should be considered when evaluating the subjective quality of encoded video content, as these effects can be as large as those seen between low- and high-quality encodings.
Researchers and practitioners trying to determine acceptable levels of video quality for actual consumption by consumers may find that the results and methods described here allow for a more accurate assessment of levels of video quality that are acceptable in a fielded service.
本研究旨在探讨内容吸引力对观众主观视频质量评分的影响。
大多数主观视频质量研究使用特别设计用于测试编码算法的短时长片段，而不将内容吸引力视为变量。
在四项研究中，我们共招募了 100 名参与者和 180 个电影片段，这些片段的编码比特率从 550 kbps 到 DVD 质量共分为九级。参与者观看时长为 2 分钟的片段，然后对片段的视频质量和电影内容的吸引力进行评价。
这些研究的结果表明，电影内容的吸引力与主观视频质量评分之间存在很强的相关性。当在更长、更自然的观看条件下观看各种编码水平和电影内容时，这种强相关性都成立。
在评估编码视频内容的主观质量时，应考虑内容的影响，因为这些影响可能与低质量和高质量编码之间的影响一样大。
研究人员和从业人员在尝试确定消费者实际消费的可接受视频质量水平时，可能会发现这里描述的结果和方法允许更准确地评估在实际服务中可接受的视频质量水平。
