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A new triangulation-based method for disparity estimation in image sequences

16th Scandinavian Conference on Image Analysis, SCIA 2009

作者： Bulatov, Dimitri Wernerus, Peter Lang, Stefan Research Institute for Optronics and Pattern Recognition Gutleuthausstr. 1 76275 Ettlingen Germany

ISBN: (纸本)3642022294

We give a simple and efficient algorithm for approximating computation of disparities in a pair of rectified frames of an image sequence. The algorithm consists of rendering a sparse set of correspondences, which are triangulated, expanded and corrected in the areas of occlusions and homogeneous texture by a color distribution algorithm. The obtained approximations of the disparity maps are refined by a semi-global algorithm. The algorithm was tested for three data sets with rather different data quality. The results of the performance of our method are presented and areas of applications and future research are outlined. © 2009 Springer Berlin Heidelberg.

关键词： Triangulation

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Femtosecond lasers for countermeasure applications

Femtosecond lasers for countermeasure applications

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Technologies for Optical Countermeasures VI

作者： Franssen, G.C. Schleijpen, H.M.A. Van Den Heuvel, J.C. Buersing, H. Eberle, B. Walter, D. TNO Defence Security and Safety Oude Waalsdorperweg 63 Hague Netherlands FGAN Reseach Institute for Optronics and Pattern Recognition D-76275 Ettlingen Germany

ISBN: (纸本)9780819477897

In recent years, much advance in the field of high-power femtosecond laser technology has been made. The high pulse power of femtosecond laser systems leads to various interesting phenomena, such as a very high power density and the formation of a plasma in the propagation medium, which is usually air. The possible application of femtosecond lasers for infrared countermeasure (CM) applications, other than direct illumination of the detector, was suggested by several authors. The goal of these countermeasures is to divert missiles from their interception course. We quantitatively examined several suggested CM applications of femtosecond lasers from the literature. Our analyses show that application of femtosecond laser beams for dazzling of missile seeker heads is not in any way promising, neither via white-light generation in the ultra-short laser pulses nor via glowing plasma. In both these cases the generated light intensity is too low to successfully compete with the signal of a typical target. Taking into account literature reports, we conclude that the most promising application of femtosecond laser beams in the field of countermeasure applications seems to be related to inducing damage of the optical components of the seeker system. © 2009 SPIE.

关键词： Femtosecond lasers

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Building extraction in urban scenes from high-resolution InSAR data and optical imagery

Building extraction in urban scenes from high-resolution InS...

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Urban Remote Sensing Joint Event

作者： Jan Dirk Wegner Uwe Soergel Antje Thiele IPI Institute of Photogrammetry and GeoInformation Leibniz Universtät Hannover Hanover Germany FGAN FOM Research Institute for Optmnics and Pattern Recognition Ettlingen Germany

Modern space borne SAR sensors provide geometric resolution of one meter, airborne systems even higher. In data of this kind many features of urban objects become visible, which were beyond the scope of radar remote sensing only a few years ago. However, layover and occlusion issues inevitably arise in undulated terrain and urban areas because of the side-looking SAR sensor principle. In order to support interpretation, SAR data are often analyzed using additional complementary information provided by maps or other remote sensing imagery. The focus of this paper is on building extraction in urban scenes by means of combined InSAR data and optical aerial imagery.

关键词： Data mining Layout Synthetic aperture radar interferometry Optical sensors Geometrical optics Sensor systems Radar remote sensing Urban areas Data analysis Image analysis

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Metric reconstruction from video sequences

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pattern recognition and Image Analysis 2008年第2期18卷 300-308页

作者： Bulatov, D. FGAN-FOM Research Institute for Optronics and Pattern Recognition Gutleuthausstr. 1 76275 Ettlingen Germany

This paper is dedicated to modifying some steps needed to generate a dense 3D-reconstruction from a video stream. Since critical motions are common in the majority of practical situations, care was taken in our work to deal with some of these motions and "stitch" projective reconstructions from different coordinate systems. Moreover, the demand for real-time-near results in these applications is huge, so the system must be able to carry out a high-quality reconstruction in the shortest time. Finally, a new calibration algorithm will be presented and a hint will be given how a fast dense reconstruction can be obtained. © 2008 Pleiades Publishing, Ltd.

关键词： Image reconstruction

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Bayesian hypothesis generation and verification

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pattern recognition and Image Analysis 2008年第2期18卷 269-274页

作者： Armbruster, W. FGAN-FOM Research Institute for Optronics and Pattern Recognition Gutleuthausstr. 1 76275 Ettlingen Germany

Regarding computer vision as optimal decision making under uncertainty, a new optimization paradigm is introduced, namely, maximizing the product of the likelihood function and the posterior distribution on scene hypotheses given the results of feature extraction. Essentially this approach is a Bayesian formulation of hypothesis generation and verification. The approach is illustrated for model-based object recognition in range imagery, showing how segmentation results can optimally be incorporated into model matching. Several new match criteria for model based object recognition in range imagery are deduced from the theory. © 2008 Pleiades Publishing, Ltd.

关键词： Object recognition

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Synchronised data acquisition for sensor data fusion in airborne surveying

Synchronised data acquisition for sensor data fusion in airb...

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11th International Conference on Information Fusion, FUSION 2008

作者： Schatz, Volker FGAN-FOM Research Institute for Optronics and Pattern Recognition Ettlingen Germany

ISBN: (纸本)9783000248832

An existing facility for data acquisition in aerial surveys is presented. It contains a laser radar, an infrared camera and a video camera. The system supports synchronisation of sensor data, even when the sensor does not inherently offer that feature. This allows data from different sensors to be merged and processed together. The necessary temporal referencing is achieved by specialised hardware implemented in a Field Programmable Gate Array, which also serves to acquire data from the IR camera. The usefulness of FPGAs for this purpose is demonstrated. The possibilities FPGAs offer are shown up, and future extensions of the system are presented.

关键词： Field programmable gate arrays (FPGA)

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Automatic generation of 3D models from real multisensor data

Automatic generation of 3D models from real multisensor data

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11th International Conference on Information Fusion, FUSION 2008

作者： Witte, Carmen Armbruster, Walter Jäger, Klaus FGAN-FOM Research Institute for Optronics and Pattern Recognition Ettlingen Germany

ISBN: (纸本)9783000248832

The demand for the prevention of collateral damages in military operations requires methods of robust automatic identification of targets like vehicles especially during target approach. This requires the development of sophisticated techniques for automatic and semi-automatic interpretation of sensor data. In particular, the pre-analysis of reconnaissance data is important for the human observers as well as for autonomous systems. A concept of generating a precise and up-to-date 3D model of a target will be proposed. The model is created from near-term laser range and infrared data gathered by reconnaissance in advance. It consists of the visible part of the object surface textured with measured infrared values. The model is evaluated by generating 2D templates for a correlation-based tracking system in an infrared image sequence of a complex scenario.

关键词： Military operations

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Towards Euclidean reconstruction from video sequences

Towards Euclidean reconstruction from video sequences

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3rd International Conference on Computer Vision Theory and Applications

作者： Bulatov, Dimitri Research Institute for Optronics and Pattern Recognition Germany

ISBN: (纸本)9789898111210

This paper presents two algorithms needed to perform a dense 3D-reconstruction from video streams recorded with uncalibrated cameras. Our algorithm for camera self-calibration makes extensive use of the constant focal length. Furthermore, a fast dense reconstruction can be performed by fusion of tessellations obtained from different sub-sequences (LIFT). Moreover, we will present our system for performing the reconstruction in a projective coordinate system. Since critical motions are common in the majority of practical situations, care has been taken to recognize and deal with them.

关键词： calibration dense reconstruction Euclidean reconstruction

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Online annotation of airborne surveillance and reconnaissance videos

Online annotation of airborne surveillance and reconnaissanc...

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11th International Conference on Information Fusion, FUSION 2008

作者： Solbrig, Peter Bulatov, Dimitri Meidow, Jochen Wernerus, Peter Thönnessen, Ulrich FOM - Research Institute for Optronics and Pattern Recognition FGAN - Research Establishment for Applied Science Ettlingen Germany

ISBN: (纸本)9783000248832

A useful enrichment of videos captured by unmanned aerial vehicles (UAVs) is the annotation of image data or determining coordinates for objects in the video. This requires georeferencing of the video frames. For surveillance or reconnaissance applications, we propose georeferencing of UAV video frames with an orthophoto. In this process, the challenge is to register temporally different images from different sensors that capture objects with quite different visual appearances. After an initial registration of the first video frame to the orthophoto, the subsequent frames are registered by image mosaicking. Whenever necessary, the mosaic is anchored by registration to the orthophoto. We explain the image-based registration approach and discuss its potential real-time processing capability. Internal performance evaluation and GPS/INS support is considered. The feasibility of the approach is demonstrated with real data sets captured by UAVs for georeferencing, video frame annotation, and motion detection.

关键词： Motion analysis

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A new concept for SAR image quality assessment realizing bar patterns in SAR images 7

A new concept for SAR image quality assessment realizing bar...

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7th European Conference on Synthetic Aperture Radar, EUSAR 2008

作者： Schulz, Karsten Thiele, Antje Thoennessen, Ulrich Ritter, Thomas Brenner, A.R. FGAN-FOM Research Institute for Optronics and Pattern Recognition Germany FGAN-FHR Research Institute for High Frequency Physics and Radar Techniques Germany

ISBN: (纸本)9783800730841

Image quality assessment of SAR images is usually done by evaluating the signal of active or passive corner reflectors, as this signal is very close to the system point response. For Electro-Optical (EO) sensors bar patterns like tree bars are widely used and standardised for image quality assessment. At the FOM a concept was developed to realize bar patterns in SAR images. A Test Field was constructed creating the necessary contrast by different surface roughness. This Test Field was recorded with the very high resolution SAR-Sensor PAMIR developed and operated by the FHR. The minimum dimensions of the Test Field are related to the considered spatial resolution of the sensor system. The sub-decimeter resolution provided by the PAMIR-system allowed to build the Test Field for this feasibility study with low effort and minimal cost. The first SAR images show that the bar patterns can be clearly identified. Furthermore, the contrast modulation achieved by the roughness variations was very successful for this purpose. Bar patterns allow an image quality assessment even by non-specialists and additionally this concept builds a bridge to image assessment procedures commonly used for EO sensors. © 2008 VDE VERLAG GMBH.

关键词： Synthetic aperture radar

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