Non-Sequential Decomposition, Composition and Presentation of Multimedia Content
Supervisor(s) and Committee member(s): Advisor(s): Laszlo Böszörmenyi (1st supervisor), Alan Hanjalic (examiner)
This thesis discusses three major issues that arise in the context of non-sequential usage of multimedia content, i.e. a usage, where users only access content that is interesting for them. These issues are (1) semantically meaningful segmentation of videos, (2) composition of new video streams with content from different sources and (3) non-sequential presentation of multimedia content.
A semantically meaningful segmentation of videos can be achieved by partitioning a video into scenes. This thesis gives a comprehensive survey of scene segmentation approaches, which were published in the last decade. The presented approaches are categorized based on the underlying mechanisms used for the segmentation. The characteristics that are common for each category as well as the strengths and weaknesses of the presented algorithms are stated. Additionally, an own scene segmentation approach for sports videos with special properties is introduced. Scenes are extracted based on recurring patterns in the motion information of a video stream.
Furthermore, different approaches in the context of real-life events are presented for the composition of new video streams based on content from multiple sources. Community-contributed photos and videos are used to generate video summaries of social events. The evaluation shows that by using content provided by a crowd of people a new and richer view of an event can be created. This thesis introduces a new concept for this emerging view, which is called “The Vision of Crowds”.
The presentation of such newly, composed video streams is described with a simple but powerful formalism. It provides a great flexibility in defining the temporal and spatial arrangement of content. Additionally, a video browsing application for the hierarchical, non-sequential exploration of video content is introduced. It is able to interpret the formal description of compositions and can be adapted for different purposes with plug-ins.
Distributed Multimedia Systems Group
Current research topics:
- Self-organizing Content Delivery
- Interactive Image and Video Search
- Multimedia Content Visualization
- Social Aspects of Multimedia Information Systems
- User-centered Multimedia Information Retrieval
- Creating Summaries and Stories out of Large Social Events
- Applications in the Medical Domain (Endoscopy) and in Traffic Surveillance
While our main interest lies in basic research, we aim to actively participate in the international scientific community and strive to apply our results in close cooperation with industry.