Peter Schallauer

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Classical film restoration is based on special copying machines to improve the quality of safekeeping copies. Only a small class of defects can be removed by such a process, because the unit of manipulation is always the physical film strip. With help of digital image processing techniques the restoration process can be adapted for each frame or even pixel(More)
Subscribers are licensed to use journal articles in a variety of ways, limited only as required to insure fair attribution to authors and the Journal, and to prohibit use in a competing commercial product. See the Journals World Wide Web site for further details. Address inquiries to the Subsidiary Rights Manager, Classical film restoration is based on(More)
MPEG-7 is an excellent choice for the description of audiovisual content due to its flexibility and comprehensiveness. The drawback is that these properties also increase the complexity of descriptions and cause ambiguities which hinder interoperability. In order to partly solve these problems, profiles and levels have been proposed, but the definitions of(More)
This paper describes the part of the European PrestoSpace project dedicated to the study and development of a Metadata Access and Delivery (MAD) system for television broadcast archives. The mission of the MAD system, inside the wider perspective of the PrestoSpace factory, is to generate, validate and deliver to the archive users metadata created through(More)
The application of the mean shift algorithm to color image segmentation has been proposed in 1997 by Comaniciu and Meer. We apply the mean shift color segmentation to image sequences, as the first step of a moving object segmentation algorithm. Previous work has shown that it is well suited for this task, because it provides better temporal stability of the(More)
—In this paper, a no-reference perceptual sharpness metric based on a statistical analysis of local edge gradients is presented. The method takes properties of the human visual system into account. Based on perceptual properties, a relationship between the extracted statistical features and the metric score is established to form a Perceptual Sharpness(More)
We present a case study of establishing a description infrastructure for an audiovisual content-analysis and retrieval system. The description infrastructure consists of an internal metadata model and access tool for using it. Based on an analysis of requirements, we have selected, out of a set of candidates, MPEG-7 as the basis of our metadata model. The(More)
Low-level feature extraction (camera motion) Ground truth annotation Manual camera motion annotation has been performed by three groups using a tool provided by Joanneum Research. Some types of content made it difficult or impossible for human annotators to describe the camera motion. The comparison of annotations of the same content done by two groups(More)
— We present detection and tracking methods for highway monitoring based on video and audio sensors, and the combination of these two modalities. We evaluate the performance of the different systems on realistic data sets that have been recorded on Austrian highways. It is shown that we can achieve a very good performance for video-based incident detection(More)
Spatial region (image) segmentation is a fundamental step for many computer vision applications. Although many methods have been proposed, less work has been done in developing suitable evaluation methodologies for comparing different approaches. The main problem of general purpose segmentation evaluation is the dilemma between objectivity and generality.(More)