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Forschung im Fachbereich Nachrichtenübertragung

Forschungsprojekte
Liste der geförderte Forschungsprojekte
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Aktuelle Forschungsgebiete
Lupe

High Efficiency Video Coding

Coding artifacts in video codecs can be reduced using several spatial in-loop filters which are part of the emerging video coding standard HEVC. In this paper, we introduce the concept of global motion temporal filtering (GMTF). A theoretical framework for a concept combining the temporal overlapping of several noisy versions of the same signal is introduced. This includes a model of the motion estimation error. As an important result it is shown that an optimum number of frames N for filtering exists. ...

Lupe

Optical Flow based Motion Estimation

Optical flow based motion estimation methods are important components of nowadays computer vision applications. We focus on the improvement of the accuracy and run-time performances of local optical flow methods. Knowing that in general the accuracy of global optical flow methods are more accurate than local when comparing dense motion fields, we focused on the fields of application that apply sparse motion information e.g. for tracking, video-based surveillance or video coding. ... 

Lupe

Multi-Object-Tracking

The Probability Hypothesis Density (PHD) filter is a multi-object Bayes filter which has recently attracted a lot of interest in the tracking community mainly for its linear complexity and its ability to deal with high clutter especially in radar/sonar scenarios. In the computer vision community however, underlying constraints are different from radar scenarios and have to be taken into account when using the PHD filter...

Lupe

Multimodal Geo-Tagging

We present a hierarchical, multi-modal approach for geo-referencing Flickr videos. Our approach makes use of external resources to identify toponyms in the metadata and of visual features to identify similar content. We use a database of more than 3.2 million Flickr images to group them into geographical areas and to build a hierarchical model. First, the geographical boundaries extraction method identifies the country and its dimension.  ...

Software & Datasets
Background Substraction / Foreground Detection
SGMM-SOD Library
Robust Local Optical Flow
RLOF Library
Multi-Object and Multi-Camera Tracking Dataset
MOCAT Dataset
Evaluation framework for abandoned object  detection
Code

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