Digital public displays can have a key role in urban ubiquitous computing infrastructures, but they have not yet managed to fill this role. A key step in that direction would be the emergence of an application model for open display networks that would enable anyone to create applications for display infrastructures. In this work, we study the development of web-based applications for public displays. We report on our experience of application development for real world public deployment and also on an experiment with external web developers to assess their ability to create such applications using our own development tools. The results show that the web-based app model can effectively be used in the context of public displays and that web developers are able to leverage upon their expertise to create this type of applications.
Abstract. Public displays are progressively embedded in urban settings. Such displays become elements of an integrated pervasive ecosystem in which various displays with multiple applications are accessed by multiple viewers. Still, many public displays employ content that is based on pre-defined schedules as encountered in conventional digital signage systems. We envision future display deployments embedding many applications that are running concurrently and able to continuously react to users' requests. In this paper, we investigate application selection and control concepts based on a mixed-initiative scenario in which display system and viewers are both involved in the process of content presentation. Our approach is inspired by traditional GUI interaction concepts and design considerations of sensing systems. Hence, this research would inform the design of novel techniques for application selection and control in pervasive display environments.
Open display networks represent a new paradigm for large scale networks of public displays that are open to applications and content from third party sources. Web technologies may be particularly interesting as a technological framework for thirdparty application development in open display networks because of their portability and widespread use. However, there are also significant challenges involved that result from the specificities of this particular usage domain. In this work, we identify and characterize some of those specificities and analyze their implications for the use of web technologies. This contribution builds on our own experience with the development of multiple web-based applications for public displays and will inform the design of new models for this type of applications.
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