How computers recognise videos
Driver assistance systems that recognise obstacles in road traffic, visual effects in films like Matrix, computer-animated characters and combined imaging processes in medicine: behind all these technologies lies a process that information researchers have been constantly working on improving for years, the so-called optical flow.
Prof. Andrés Bruhn from the Institute of Visualisation and Interactive Systems at the University of Stuttgart is a specialist in this field. At the “European Conference on Computer Vision“ in Zürich recently he was awarded the “Jan Koenderink Prize for Fundamental Contributions in Computer Vision“ jointly with colleagues for a method developed ten years ago. This is one of the most renowned prizes in the field of machine vision and honours works that have proven particularly valuable after a decade.
How can computers be put in a position to recognise movements in a video as accurately as possible? This question has been occupying computer science researchers for around 30 years. Since receiving his doctorate Prof. Andrés Bruhn has been dealing with the optical flow in order to accelerate the machine vision of video images and to improve them in terms of quality.
But what exactly is an optical flow? Broadly speaking what lies behind the method is an algorithm that observes each pixel of an individual video image and estimates its movement with regard to its reference image.
Numerous technologies can be realised using this principle. For example real non-existent intermediate images can be created in order to generate slow motion effects without loss of quality in the film industry or create computer-generated film sequences from video recordings. The face of an actor can be reconstructed in this way with realistic facial expressions and gestures and then be replaced by a virtual character. Also applications in the automotive field are based on the calculation of flow fields.
In this respect there are driver assistance systems that recognise distances to obstacles based on camera recordings, identify moving objects, predict collisions or make other statements on the traffic situation. Another sector of the economy in which the optical flow is used is medical image processing. For example recordings of different imaging processes are superimposed there to be able to investigate the growth of a tumour in more concrete terms, for instance.
“The available optical flow methods have proved their worth in many applications“, said Prof. Andrés Bruhn, “but still they are subject to a great number of restrictions. To minimise these further and to develop further fields of application is the objective of our work.“
His research team particularly deal with the utilisation of recordings with bad lighting or rapid movement or colour changes but also the concrete estimate of object arrangements in a room and the basic improvement of reconstructed computer models are the focus of their work.
This year Andrés Bruhn was awarded the Koenderink Prize for a method he had already developed with his colleagues Thomas Brox, Nils Papenberg and Joachim Weickert in 2004 whilst doing his doctorate at the University of Saarland. At the time the research team succeeded in greatly increasing the accuracy compared to methods already available.
The award is one of the most renowned prizes in the field of machine vision and honours works that have particularly proven their worth after a decade. Since its publication the work has been quoted over 1,200 times, clearly showing the special value of the work for science.
You can find the specialist article at
Tina Barthelmes, University of Stuttgart, Visualisation Institute (VISUS), Tel. 0711/685-88604,
Email: tina.barthelmes (at) visus.uni-stuttgart.de
Prof. Andrés Bruhn, Institute of Visualisation and Interactive Systems, Tel.: 0711/685-88439,
Email: andres.bruhn (at) vis.uni-stuttgart.de
Birgit Vennemann, University of Stuttgart, Department of University Communication, Tel. 0711/685-82122,
Email: birgit.vennemann (at) hkom.uni-stuttgart.de
Andrea Mayer-Grenu | idw - Informationsdienst Wissenschaft
Quantum Technology for Advanced Imaging – QUILT
24.04.2018 | Fraunhofer-Institut für Lasertechnik ILT
Paint job transforms walls into sensors, interactive surfaces
24.04.2018 | Carnegie Mellon University
At the Hannover Messe 2018, the Bundesanstalt für Materialforschung und-prüfung (BAM) will show how, in the future, astronauts could produce their own tools or spare parts in zero gravity using 3D printing. This will reduce, weight and transport costs for space missions. Visitors can experience the innovative additive manufacturing process live at the fair.
Powder-based additive manufacturing in zero gravity is the name of the project in which a component is produced by applying metallic powder layers and then...
Physicists at the Laboratory for Attosecond Physics, which is jointly run by Ludwig-Maximilians-Universität and the Max Planck Institute of Quantum Optics, have developed a high-power laser system that generates ultrashort pulses of light covering a large share of the mid-infrared spectrum. The researchers envisage a wide range of applications for the technology – in the early diagnosis of cancer, for instance.
Molecules are the building blocks of life. Like all other organisms, we are made of them. They control our biorhythm, and they can also reflect our state of...
University of Connecticut researchers have created a biodegradable composite made of silk fibers that can be used to repair broken load-bearing bones without the complications sometimes presented by other materials.
Repairing major load-bearing bones such as those in the leg can be a long and uncomfortable process.
Study published in the journal ACS Applied Materials & Interfaces is the outcome of an international effort that included teams from Dresden and Berlin in Germany, and the US.
Scientists at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) together with colleagues from the Helmholtz-Zentrum Berlin (HZB) and the University of Virginia...
Novel highly efficient and brilliant gamma-ray source: Based on model calculations, physicists of the Max PIanck Institute for Nuclear Physics in Heidelberg propose a novel method for an efficient high-brilliance gamma-ray source. A giant collimated gamma-ray pulse is generated from the interaction of a dense ultra-relativistic electron beam with a thin solid conductor. Energetic gamma-rays are copiously produced as the electron beam splits into filaments while propagating across the conductor. The resulting gamma-ray energy and flux enable novel experiments in nuclear and fundamental physics.
The typical wavelength of light interacting with an object of the microcosm scales with the size of this object. For atoms, this ranges from visible light to...
13.04.2018 | Event News
12.04.2018 | Event News
09.04.2018 | Event News
25.04.2018 | Physics and Astronomy
25.04.2018 | Materials Sciences
25.04.2018 | Studies and Analyses