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One of todays research trends in the hypermedia field is hypervideo. The most important components of hypervideo are hypertext, film and video, but other media may be also used integrated. Due to its time-based nature, hypervideo presents requires different aesthetic and rhetoric consideration than traditional static hypermedia. Hypervideo cannot be classified as film, video or hypertext. Hypervideo has the potential to be nonlinear, but opposed to text it is not static. As soon as hypervideo is included in a hypermedia system, the use of the time concept is forced for the whole system. Also, static media rhetoric may require changes in order to mitigate the confusion user experience when navigating between dynamic to static media. The need for the concept of time in a hypervideo system introduces a higher degree of complexity. Synchronization between videos or other media is now required, but static synchronization is not enough. Applications such computer-based training may require a dynamic synchronization. For example, in the case of a computer-based medical procedure guidance system, it may be needed provide guidance for different sequences of steps due to the nature of the procedure or to non-controllable situations. For instance, consider a paramedic performing a routine medical procedure using the computer-based medical procedure guiding system. During the procedure a complication may arise. Lets imagine the patient develops an unexpected allergic reaction as a result of the administration of two drugs. The system should be able to find the appropriate video procedures and coordinate its insertion within the routine procedure. Depending on the case, this coordination would imply that after solving the situation, the paramedic should continue with the routine procedure. Another situation may require that after solving the complication, the routine procedure should be modified slightly. This possible modification implies to re-synchronize the video-clips or segments of video that embody the routine procedure. A hypervideo system should be able to get input from the real world situation and to provide on-line synchronization of the video segments. Also lets assume the system needs to adapt to different users with different backgrounds, knowledge and perspectives. A hypervideo system should be able to dynamically segment the video in order to meet the user expectations and needs.
Current hypervideo systems do not meet the requirements for such a system. The present document presents a view of the current state of the hypervideo research and systems. The next section presents the characteristics of hypervideo, its rhetoric and the research issues and approaches to those issues. Following that section, a view of the hypervideo-authoring field is presented. Continuing the presentation is a presentation of applications that currently implement some hypervideo functionality. Finally, the last section presents seven research areas for the development of the next generation of hypervideo.
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