Michael Wollborn

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Flexibility and efficiency of coding, content extraction, and content-based search are key research topics in the field of interactive multimedia. Ongoing ISO MPEG-4 and MPEG-7 activities are targeting standardization to facilitate such services. European COST Telecommunications activities provide a framework for research collaboration. COST 211 and COST(More)
An algorithm for automatic, noise robust 2D shape estimation of moving objects in video sequences considering a moving camera is presented. Such algorithms are required for object–based coding techniques like the upcoming ISO/MPEG–4 standard. In a first step, a possibly apparent camera motion is estimated and compensated. By the second step, a possibly(More)
An algorithm for automatic, noise robust segmentation of moving objects in image sequences is presented. Such algorithms are required for object–based coding techniques like the upcoming ISO/MPEG–4 standard. In a first step, a mask of changed image areas is estimated by a local thresholding relaxation technique. Then, areas of uncovered background are(More)
In this paper we describe an interactive video object segmentation tool developed in the framework of the ACTSAC098 MOMUSYS project. The Video Object Generator with User Environment (VOGUE) combines three different sets of automatic and semi-automatic tools (spatial segmentation, object tracking and temporal segmentation) with general purpose tools for user(More)
This paper discusses the usefulness of a partition-based image representation in the context of user-assisted segmentation, and compares it with the two other most common image representations in this framework: pixel-based and transitionbased. Partition-based image representations allow userinteraction at the region level, which is a very natural and(More)
An object–based layered coder for the transmission of image sequences at very low bit rates between 8 and 64 kbit/s is presented. In layer 1, only colour parameters are transmitted, whereas in layer 2 additionally motion parameters are transmitted in order to apply motion compensated prediction. In layer 3, in addition to colour and motion parameters, shape(More)
Modern in-car infotainment and navigation systems will incorporate features from the automotive electronics as well as from the consumer electronics. These domains have very different innovation cycles, with effects on the hardware and software development process. The “Innovation Cycle Dilemma” refers to the difficulty in integrating both domains. This(More)
In this paper an object-based displacement estimation and motion compensated prediction technique for hybrid video coding is presented. While video codecs like H.263, MPEG-2 and MPEG-4 use only one displacement vector for the motion compensated prediction of an image block, the presented object-based technique can use two different displacement vectors for(More)