![]() The event-based and event-tree systems proposed by Kholief et al. In the telemedicine systems presented in, , playback functions were provided, but were restricted to chronological order only since all the communication packets within the session were time-stamped to facilitate their synchronization during playback. However, whilst this approach enabled a synchronization of the various data objects during the playback sequence, the provision of specific playback functions was not considered. ![]() presented a telemedicine consultation playback system in which a discrete event system specification (DEVS) approach was used to couple the data objects within the system and to model their behavior over time. ![]() However, in the majority of the telemedicine and teleconsultation systems presented in the literature, playback functions are addressed only in passing, ,, ,, ,, ,, ,, ,, , or have no more than a limited functionality, ,,. In medical teleconsultation systems, the ability to replay sessions on demand is of crucial importance since it provides the opportunity to resolve arguments relating to the corresponding case and enables the multimedia content within the session to be used for teaching purposes. One area in which collaborative systems have found particular use is that of telemedicine and teleconsultation, and it is now common practice for physicians to use such systems as a means of analyzing medical images, discussing patients’ symptoms, consulting with other medical experts, and so forth, ,, ,, ,, ,, ,, ,, ,, ,,. With the widespread deployment of the Internet nowadays and the increasing power and sophistication of network communication technologies, many collaborative systems have been proposed to support users in geographically dispersed areas in transmitting and sharing multimedia data, ,, ,. The evaluation results confirm that TIH outperforms existing scene-based retrieval systems in terms of both an improved computational efficiency and a lower storage requirement. In the proposed indexing scheme, the performance of the cut-in point determination process and the content restoration procedure is enhanced by maintaining a link between all the changes which take place in the image contents over the duration of the session and the commands which induce these changes. In this study, this is achieved by using an indexing scheme designated as three- level indexing hierarchy ( TIH) to search for the appropriate cut-in point in the session and to identify the commands which should be applied to restore the current image contents to their original condition at the cut-in point. Since the contents of telemedicine sessions vary over time depending on the particular commands invoked by the physician(s) during the session, when executing the smart playback functions, it is necessary to restore the target image contents to the appropriate condition before commencing the playback routine. These functions include replaying the session from a specified point in time, replaying all the session segments controlled by a particular physician, replaying all the session segments relating to a specific medical image, and playing a montage of the entire session. This paper presents a novel indexing architecture to support a range of smart playback functions in collaborative telemedicine systems.
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