Jakob Schou Pedersen

Evaluating user preferences for video transfer methods from a mobile device to a TV screen

This article reports on the evaluation of four methods for transferring video content from a mobile device to a fixed television. The methods have been investigated in a Wizard-of-Oz approach through two consecutive studies. The first experiment aimed at collecting general opinions toward such a feature as well as preferences in terms of usability. In general, participants preferred methods that resemble already known interaction paradigms, and argued against the need of moving physically. From the comments collected in the first study, six potential indicators of preference were generated and investigated in a second experiment. The results indicate that familiarity, convenience and annoyance are strong predictors of the preference level of methods for transferring video content from a mobile- to a fixed device. A discussion and potential design guidelines are finally proposed.

Evaluating Ubiquitous Media Usability Challenges: Content Transfer and Channel Switching Delays

As ubiquitous media is developing rapidly, new HCI challenges emerge. In this paper, we address usability issues related to the transfer of con- tent between fixed and mobile devices, as well as channel switching delays on mobile devices. We first provide an extensive review of the field. We then evaluate four relatively novel approaches for initiating a transfer of video con- tent from a mobile phone to a TV screen. Seen from a users point of view, fa- miliarity and comfort are found to be important decision factors when selecting a preference among the proposed methods. Furthermore, we identify a threshold level above which people appear to be annoyed when switching between TV channels on a mobile device, and investigate factors that may influence the perceived acceptability of such delay.

Acceptable channel switching delays for mobile TV

This paper presents a user study investigating the acceptability of channel switching delays on mobile television systems. The authors first review the previous work in the area, then propose a study design and present results from its implementation, focusing on the overall acceptability threshold as well as three potential effect factors: the transition type, the test environment and the audiovisual content. The results show that delays longer than 5.7 seconds annoyed test participants, and that the transition type had a significant impact on the rating of channel switching delays. However, neither the test environment nor the audiovisual content influenced the ratings significantly. Finally, a discussion of these results and directions for future research are proposed.