Guest editorial: Special issue on multimedia information systems

Stavros Christodoulakis, Anastasia Analyti
1995 Information Systems  
Multimedia Information Systems (MIS's) have become the focus of intense academic and industrial interest. Large industries like the computer, telecommunications, consumer electronics, publications, movie and broadcasting, see multimedia information systems in the core of their business, and a common technology across traditionally separate industries. Many recent strategic alliances across industries have as objective to strengthen their multimedia capabilities and information resources, as
more » ... as the appropriate business positioning in an expanding application environment. Multimedia Information Systems are concerned with the capturing, the storage, the manipulation, the retrieval and effective presentation of multimedia information such as traditional data, text, still images, graphics, animations, sound and video. Computer and communication hardware and software has been recently developed, that makes the management and presentation of good quality multimedia data effective, and advances in the development of multimedia standards have paved the road to multimedia information publication and to open access to multimedia information. Multimedia information systems will provide the integrated environments for effective and efficient management of large multimedia information repositories. MIS's have to address difficult performance problems due to the massive volume of multimedia, as well as due to their real-time and synchronization requirements. Multimedia data typically require very large storage capacity and the use of multi-level storage devices. These storage devices should be uniformly modeled and integrated under a single storage manager which should be capable to handle efficiently the long multimedia data and their placement across the levels of the storage hierarchy while exploiting parallelism for the final delivery of data. Appropriate scheduling algorithms should be developed that allow good performance with a mixture of delay-sensitive and non delay-sensitive data. The presentation of complex multimedia objects imposes dependency relationships among the information units of different streams. Appropriate coordination during stream delivery is required for the satisfaction of these constraints. A key performance aspect for the user is the mechanisms provided by the system for effectively finding the desired information in a large multimedia information base. To support queries by content, multimedia data should be analyzed and description of their content should be extracted and stored in the database together with the original data. Because content-based queries tend to be imprecise, database search expresses similarity rather than exact match. This implies the definition of some distance measure between the query and the stored multimedia objects which captures what humans perceive as similarity between the objects. Browsing functionality is necessary to complement a multimedia retrieval language because in most cases users will be unable to describe precisely the objects they want. This involves structuring of information in the multimedia database in order to provide for effective navigation. This special issue on Multimedia Information Systems contains five papers, covering significant aspects of the multimedia information technology, including: delay-sensitive data, video-ondemand services, queries based on image content, hypermedia versioning and multimedia object synchronization. Given the real-time requirements of each client, the fixed bandwidth of the disks, and the available buffer space, a multimedia server must employ an admission control algorithm to decide whether a new client can be admitted. In the paper "Schemes for Implementing Buffer Sharing in
doi:10.1016/0306-4379(95)00023-w fatcat:lmvfz5vruzdmbbbdo2ewg3fbba