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检索条件"机构=Research Institute for Optronics and Pattern Recognition"

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Atmospheric phase screen-estimation for PSInSAR applied to TerraSAR-X high resolution spotlight-data

Atmospheric phase screen-estimation for PSInSAR applied to T...

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IEEE International Symposium on Geoscience and Remote Sensing (IGARSS)

作者： Markus Even Alexander Schunert Karsten Schulz Uwe Soergel Fraunhofer Research Institute of Optronics and Pattern Recognition Ettlingen Germany Institute of Photogrammetry and GeoInformation Leibniz Universität Hannover Germany

The PSInSAR technique, invented by Ferretti et. al. ten years ago, meanwhile has proven it's capability for very precise measurement of surface deformations. To achieve this, the influence of the atmospheric phase screen (APS) has to be removed. We investigated the APS for two series of TerraSAR-X high resolution spotlight data of a scene in Bavaria. Our approach was to consider the APS as composed of a phase ramp, a part stratified with height and a turbulent component. We estimated the turbulent component via kriging. The variograms show for short distances a regime which is not visible for lower resolutions. In this paper we discuss the choice of appropriate variogram models with respect to our data.

关键词： Atmospheric modeling Estimation Data models Delay Atmospheric measurements Orbits

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Detection and tracking of objects with direct integration of perception and expectation

Detection and tracking of objects with direct integration of...

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2009 IEEE 12th International Conference on Computer Vision Workshops, ICCV Workshops 2009

作者： Jüngling, Kai Arens, Michael Research Institute for Optronics and Pattern Recognition Ettlingen Germany

ISBN: (纸本)9781424444427

One of the main challenges in video-based multi-target tracking is the consistent maintenance of object identities over time. We present a novel approach to that challenge that integrates tracking and detection in a single process. We thereby inherently solve the identity problem and gain additional stability of the object detection performance. For that purpose, we extend a state-of-the-art local-feature based object detector by integrating expectations resulting from tracking directly into the detection procedure on the level of features. By that combination of newly gathered and expected local features we are able to directly integrate new data-evidence with object knowledge collected in the past without changing the detection approach itself. Since our tracking approach is solely based on local features, without employing other features like color or shape, it works independently of underlying video-data characteristics and preserves the general applicability independent of object-class specifics. ©2009 IEEE.

关键词： Object detection

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Segmentation and Fusion of Building Features Based on InSAR and Optical Data

Segmentation and Fusion of Building Features Based on InSAR ...

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SPIE Conference on Remote Sensing for Environmental Monitoring, GIS Applications, and Geology IX

作者： Thiele, A. Wegner, J. D. Cadario, E. Schulz, K. Soergel, U. FGAN-Research Institute for Optronics and Pattern Recognition (Germany) Leibniz Univ. Hannover (Germany)

ISBN: (纸本)9780819477835

The new generation of space borne SAR sensors provides geometric resolution of one meter, airborne systems even higher. In this high resolution data many features of urban objects become visible, which were beyond the scope of radar remote sensing only a few years ago. Focusing on elevated objects (e.g., urban area), layover, and occlusion issues inevitably arise because of the side-looking SAR sensor principle. In order to support interpretation, SAR data are often analyzed using additional 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： Remote Sensing Fusion Feature Extraction InSAR Data Optical Data Urban Area

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

引用

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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Optical limiting performance of nanoparticles in liquid and solid media

Optical limiting performance of nanoparticles in liquid and ...

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Electro-Optical and Infrared Systems: Technology and Applications VI

作者： Dengler, S. Ritt, G. Eberle, B. FGAN-FOM Research Institute for Optronics and Pattern Recognition Gutleuthausstr. 1 76275 Ettlingen Germany

ISBN: (纸本)9780819477873

We present our investigation of the optical limiting behaviour of different metal and semiconductor nanoparticles in liquid and solid media. Nonlinear transmission measurements were performed by the use of nanosecond laser pulses at 532 nm and 1064 nm. For the various nanoparticles in liquid media large differences in the limiting response were found. Foremost the solid state samples are promising in terms of laser protection devices. © 2009 SPIE.

关键词： Liquids

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Exploiting range imagery: Techniques and applications

Exploiting range imagery: Techniques and applications

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International Symposium on Photoelectronic Detection and Imaging 2009: Laser Sensing and Imaging

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

ISBN: (纸本)9780819476630

Practically no applications exist for which automatic processing of 2D intensity imagery can equal human visual perception. This is not the case for range imagery. The paper gives examples of 3D laser radar applications, for which automatic data processing can exceed human visual cognition capabilities and describes basic processing techniques for attaining these results. The examples are drawn from the fields of helicopter obstacle avoidance, object detection in surveillance applications, object recognition at high range, multi-object-tracking, and object re-identification in range image sequences. Processing times and recognition performances are summarized. The techniques used exploit the bijective continuity of the imaging process as well as its independence of object reflectivity, emissivity and illumination. This allows precise formulations of the probability distributions involved in figure-ground segmentation, feature-based object classification and model based object recognition. The probabilistic approach guarantees optimal solutions for single images and enables Bayesian learning in range image sequences. Finally, due to recent results in 3D-surface completion, no prior model libraries are required for recognizing and re-identifying objects of quite general object categories, opening the way to unsupervised learning and fully autonomous cognitive systems. © 2009 SPIE.

关键词： Object recognition

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Validation of the thermal code of RadTherm-IR, IR-workbench and F-TOM

Validation of the thermal code of RadTherm-IR, IR-workbench ...

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Infrared Imaging Systems: Design, Analysis, Modeling, and Testing XX

作者： Schwenger, Frédéric Grossmann, Peter Malaplate, Alain Research Institute for Optronics and Pattern Recognition FGAN-FOM Gutleuthausstr. 1 76275 Ettlingen Germany

ISBN: (纸本)9780819475664

System assessment by image simulation requires synthetic scenarios that can be viewed by the device to be simulated. In addition to physical modeling of the camera, a reliable modeling of scene elements is necessary. Software products for modeling of target data in the IR should be capable of (i) predicting surface temperatures of scene elements over a long period of time and (ii) computing sensor views of the scenario. For such applications, FGAN-FOM acquired the software products RadTherm-IR (ThermoAnalytics Inc., Calumet, USA) and IR-Workbench (OKTAL-SE, Toulouse, France). Inspection of the accuracy of simulation results by validation is necessary before using these products for applications. In the first step of validation, the performance of both "thermal solvers" was determined through comparison of the computed diurnal surface temperatures of a simple object with the corresponding values from measurements. CUBI is a rather simple geometric object with well known material parameters which makes it suitable for testing and validating object models in IR. It was used in this study as a test body. Comparison of calculated and measured surface temperature values will be presented, together with the results from the FGAN-FOM thermal object code F-TOM. In the second validation step, radiances of the simulated sensor views computed by RadTherm-IR and IR-Workbench will be compared with radiances retrieved from the recorded sensor images taken by the sensor that was simulated. Strengths and weaknesses of the models RadTherm-IR, IR-Workbench and F-TOM will be discussed. ©2009 SPIE.

关键词： Surface temperature

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Protection of optical systems against laser radiation

Protection of optical systems against laser radiation

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Electro-Optical and Infrared Systems: Technology and Applications VI

作者： Ritt, G. Dengler, S. Eberle, B. FGAN-FOM Research Institute for Optronics and Pattern Recognition Gutleuthausstr. 1 76275 Ettlingen Germany

ISBN: (纸本)9780819477873

Both the increasing use of laser devices on the battlefield and the misuse of laser devices in civil environments (e.g. dazzling of pilots during approach) necessitate laser protection devices. Conventional laser protection filters based on absorption or interference effects only work in narrow wavelength bands and are usually not neutral in colour. Thus, they are not appropriate for such scenarios. Optical power limiting devices based on nonlinear optical effects (nonlinear absorption, nonlinear refraction, induced scattering) were proposed to offer broadband laser protection without disturbing the visual colour impression. Usually, optical nonlinear materials are examined in laboratory setups which are different from realistic optical systems. We report on the integration of nonlinear laser protection devices into different optical systems to prove the performance of limiting for commonly used optical systems. © 2009 SPIE.

关键词： Laser safety

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Model-based object recognition in range imagery

Model-based object recognition in range imagery

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Electro-Optical and Infrared Systems: Technology and Applications VI

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

ISBN: (纸本)9780819477873

The paper formulates the mathematical foundations of object discrimination and object re-identification in range image sequences using Bayesian decision theory. Object discrimination determines the unique model corresponding to each scene object, while object re-identification finds the unique object in the scene corresponding to a given model. In the first case object identities are independent;in the second case at most one object exists having a given identity. Efficient analytical and numerical techniques for updating and maximizing the posterior distributions are introduced. Experimental results indicate to what extent a single range image of an object can be used for re-identifying this object in arbitrary scenes. Applications including the protection of commercial vessels against piracy are discussed. © 2009 SPIE.

关键词： Object recognition

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Improved target detection by IR dual-band image fusion

Improved target detection by IR dual-band image fusion

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Electro-Optical and Infrared Systems: Technology and Applications VI

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

ISBN: (纸本)9780819477873

Dual-band thermal imagers acquire information simultaneously in both the 8-12 μm (long-wave infrared, LWIR) and the 3-5 μm (mid-wave infrared, MWIR) spectral range. Compared to single-band thermal imagers they are expected to have several advantages in military applications. These advantages include the opportunity to use the best band for given atmospheric conditions (e. g. cold climate: LWIR, hot and humid climate: MWIR), the potential to better detect camouflaged targets and an improved discrimination between targets and decoys. Most of these advantages have not yet been verified and/or quantified. It is expected that image fusion allows better exploitation of the information content available with dual-band imagers especially with respect to detection of targets. We have developed a method for dual-band image fusion based on the apparent temperature differences in the two bands. This method showed promising results in laboratory tests. In order to evaluate its performance under operational conditions we conducted a field trial in an area with high thermal clutter. In such areas, targets are hardly to detect in single-band images because they vanish in the clutter structure. The image data collected in this field trial was used for a perception experiment. This perception experiment showed an enhanced target detection range and reduced false alarm rate for the fused images compared to the single-band images. © 2009 SPIE.

关键词： Image fusion

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