Showing papers by "Katsumi Tanaka published in 1998"

Cut as a querying unit for WWW, Netnews, and E-mail

Abstract: In this paper, we propose a query framework for hypertext data in general, and for WWW pages, Netnews articles, and e-mails in particular. In existing query tools for hypertext data, such as search engines for WWW or intelligent news/mail readers, data units in query are typically individual nodes. In actual hypertext data, however, one topic is often described over a series of connected nodes, and therefore, the logical data unit should be such a series of nodes corresponding to one topic. This discrepancy between the data unit in query and the logical data unit hinders the e cient information discovery from hypertext data. To solve this problem, in our framework, we divide hypertexts into connected subgraphs corresponding to individual topics, and we use those subgraphs as the data units in queries.

Semantic Structures for Video Data Indexing

Abstract: Video indexing based on contents annotations can fully explore semantic information of video data. However, the most difficult and time-consuming process in annotation-based indexing is to identify appropriate video intervals for various semantic contents manually. Thus, automatic discovering video intervals from video data will be helpful for the indexing work. For this purpose, we propose "semantic structures" of video data and a mechanism for discovering semantic structures. The basic concept of our approach is to (1) discover consecutive sequences of shots from video data, each of which represents a consistent action or situation, and (2) index each of the discovered video intervals based on its semantics. A semantic structure is a collection of discovered video intervals that are classified into three categories: "unchanged" (i.e. actors or backgrounds are unchanged throughout the interval), "gradually changing" (i.e. actors or backgrounds are changing shot by shot) and "multiplexing" (i.e. individual actors or backgrounds are appearing by turns). The mechanism discovers these types of video intervals by comparing and contrasting similarity between each shot, and indexes each of discovered intervals by using indexing algorithms prepared for each type. We show how well our approach works for identifying video intervals with some experimental results.

Advanced Database Systems for Integration of Media and User Environments '98

Abstract: From the Publisher: This volume is a progress report on the project Research and Development of Advanced Database Systems for Integration of Media and User Environments, supported by the Ministry of Education, Science, Sports and Culture of Japan. It investigates research on new database systems due to the recent development of network technology; a clearer picture of integration by database technology is drawn as a result.

Advanced Database Systems for Integration of Media and User Environments ’98: Proceedings of the Workshop

Abstract: From the Publisher: This volume is a progress report on the project Research and Development of Advanced Database Systems for Integration of Media and User Environments, supported by the Ministry of Education, Science, Sports and Culture of Japan. It investigates research on new database systems due to the recent development of network technology; a clearer picture of integration by database technology is drawn as a result.

Hypermedia Broadcasting with Temporal Links

Abstract: In this paper, we propose a temporal link mechanism for ’time-dependent’ hypermedia. It has become a serious problem to maintain link information at all times according to updating. It is very important to keep consistency and maintain the updates, especially for broadcast hypermedia, which are transmitted from a server to a client via the internet or a broadcasting system. The mechanism we propose supports links in broadcast hypermedia to designate adequate anchors automatically. We also describe the implementation issues of the link mechanism.