Diese Datenbank enthält über 40.000 Dokumente zu Themen aus den Bereichen Formalerschließung – Inhaltserschließung – Information Retrieval.
© 2015 W. Gödert, TH Köln, Institut für Informationswissenschaft / Powered by litecat, BIS Oldenburg (Stand: 04. Juni 2021)
1Christel, M.G.: Automated metadata in multimedia information systems : creation, refinement, use in surrogates, and evaluation.
San Rafael, Calif. : Morgan and Claypool, 2009. 74 S.
(Synthesis lectures on information concepts, retrieval & services)
Abstract: Improvements in network bandwidth along with dramatic drops in digital storage and processing costs have resulted in the explosive growth of multimedia (combinations of text, image, audio, and video) resources on the Internet and in digital repositories. A suite of computer technologies delivering speech, image, and natural language understanding can automatically derive descriptive metadata for such resources. Difficulties for end users ensue, however, with the tremendous volume and varying quality of automated metadata for multimedia information systems. This lecture surveys automatic metadata creation methods for dealing with multimedia information resources, using broadcast news, documentaries, and oral histories as examples. Strategies for improving the utility of such metadata are discussed, including computationally intensive approaches, leveraging multimodal redundancy, folding in context, and leaving precision-recall tradeoffs under user control. Interfaces building from automatically generated metadata are presented, illustrating the use of video surrogates in multimedia information systems. Traditional information retrieval evaluation is discussed through the annual National Institute of Standards and Technology TRECVID forum, with experiments on exploratory search extending the discussion beyond fact-finding to broader, longer term search activities of learning, analysis, synthesis, and discovery.
Inhalt: Table of Contents: Evolution of Multimedia Information Systems: 1990-2008 / Survey of Automatic Metadata Creation Methods / Refinement of Automatic Metadata / Multimedia Surrogates / End-User Utility for Metadata and Surrogates: Effectiveness, Efficiency, and Satisfaction
Themenfeld: Metadaten ; Multimedia
2Christel, M.G.: ¬The role of visual fidelity in computer-based instruction.
In: Human-computer interaction. 9(1994) no.2, S.183-223.
Abstract: New digital video technologies provide a wide spectrum of multimedia user interfaces for computer assisted instruction on personal computers. Describes an experiment, conducted at the Software Engineering Institute, Carnegie Mellon University, Pennsylvania, using a digital video course on code inspection, to study and determine the effects of such capabilities on recall performance and attitude. Results suggest that the presentation of materials as motion video rather than as a slide show within an interactive video course leads to better recall performance. In addition, the presence of motion video in the interfaces and the use of surrogate travel (virtual reality) for navigation promote better student opinions toward the subject matter
Themenfeld: Computer Based Training