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Latest Issues on Multimedia Database
KMeD database is presented by features and objects. The selected objects of interest in medical images such as X-Ray and MR image are segmented using knowledge-based model-guiding techniques. As with other multimedia database system features and contents of the medical image are extracted and stored in a feature and content database. In KMeD, Type Abstraction Hierarchies (TAHs) is used to represent the knowledge about the image in three structures. A query process supports operators such as "similar to" and "nearby" and conceptual terms such as "small" and "large" to find the approximate matches to the features and contents. A technique has been developed for visual interface to use point-click-and-drag input. This new development by UCLA, namely KMeD database, can change the way hospitals maintain and utilize all of their data.
Future requirements of distributed multimedia systems will be even much more demanding than it is now. It is envisaged that users will be heavily mobile and require ubiquitous access to, and satisfactory presentation of, multimedia data, regardless of the actual connectivity and the specific presentation device they are currently using (e.g., wire-based vs. wireless network, high-resolution graphics screen vs. Web-enabled cellular phone). Moreover, users will expect to find information and multimedia contents faster and easily, and will interact with the contents much more intensively than today. In this scope, the CODAC and its sister project aims at realizing a quality adaptive end-to-end multimedia system, i.e., we shall provide means for indexing and retrieving multimedia data by their content and adaptation capabilities and develop methods to guarantee a quality adaptive video transport to the client. Depicts the architectural view of the end-to-end multimedia system, which we would like to realize. For this we need to carry out a number of activities and the following are the first work items under development in the CODAC project: 1-Development of a multimedia cartridge in the core of an Oracle 9i DBMS: The advantages of the cartridge technology, as proposed by Oracle and other database vendors, are reusability, extensibility and especially a very clean interface to components of the database system, like query processor, optimizer and page access management. This multimedia cartridge realizes the meta-database and provides access to the clients for complex search functionality, supported by advanced indexing structures (like a combination of X-trees, SS-trees, etc.).
2. Realization of a Processing Unit for MPEG-4 videos: The Processing Unit is supposed to be situated between the video server and the meta-database and shall extract the necessary quality adaptation capability information from the A/V streams to be stored as meta-data in the database. Upon the insertion of the video (the insertion could be on demand or on a regular basis), the Processing Unit shall apply efects such as transformation and scaling to the MPEG-4 encoded videos and report results (performance and variation information) to the meta-database and write back the adapted videos to the video server.
Implementation of an
indexing structure for the access of MPEG-7 files, possibly in BiM format: 4. Realization of the cross-referencing between MPEG-7 and MPEG-4, i.e., how to access media data from meta-data and vice-versa: indexing structures of the later work item shall be employed and integrated into a reference stream which allows the efficient access of the meta-data from the media-data. Referencing of MPEG-7 and MPEG-4 will be employed in the proxy-cache and in the active routers. The application scenarios, we focus upon are sport event videos, M3box, and tele-teaching. Sport events are an interesting application scenario since these videos provide semantically rich content. The M3box is an adaptive multimedia message box. It is developed by Siemens Corporate Technology. 2) In cooperation with our Institute. The final application is tele-teaching. This application differs from the previous ones, as here, multimedia data plays a supporting role, rather than being the central data component. Therefore, the meta-database has to keep, besides descriptive information on the multimedia data, information on the tele-teaching material and the teaching process.
Future Improvement The most interesting and exciting thing about multimedia databases is how quickly they're evolving. This growth, along with the emergence of inexpensive removable storage devices such as DVD-which stores tens of gigabytes-will ignite an explosion of multimedia applications. This explosion, in turn, will fuel an intense need for powerful multimedia databases.
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