Can small be beautiful?: assessing image resolution requirements for mobile TV
Can small be beautiful?: assessing image resolution requirements for mobile TV
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DOI：
10.1145/1101149.1101331
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发表时间：
2005-11
期刊：
影响因子：
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通讯作者：
H. Knoche;J. McCarthy;M. Sasse
中科院分区：
文献类型：
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作者：
H. Knoche;J. McCarthy;M. Sasse
目前有几个国家正在提供移动电视服务，但由于费用原因，大多数这些服务提供的材料直接重新编码以供移动消费（即无需额外编辑）。本文报道的实验旨在评估在移动设备上显示这类材料的图像分辨率和比特率要求。这项有128名参与者参与的研究调查了四种不同图像分辨率、七种视频编码比特率、两种音频比特率和四种内容类型的反应。结果表明，无论内容类型如何，小于168x126的图像的可接受性都明显较低。当带宽充足时，这种影响更为明显，这是由于重要的细节在较小的屏幕上丢失所致。与之前的研究相反，当音频质量很高时，参与者更有可能将图像质量评为不可接受的。
Mobile TV services are now being offered in several countries, but for cost reasons, most of these services offer material directly recoded for mobile consumption (i.e. without additional editing). The experiment reported in this paper, aims to assess the image resolution and bitrate requirements for displaying this type of material on mobile devices. The study, with 128 participants, examined responses to four different image resolutions, seven video encoding bitrates, two audio bitrates and four content types. The results show that acceptability is significantly lower for images smaller than 168x126, regardless of content type. The effect is more pronounced when bandwidth is abundant, and is due to important detail being lost in the smaller screens. In contrast to previous studies, participants are more likely to rate image quality as unacceptable when the audio quality is high.