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Where is the hole punch? Object localization capabilities on a specific bureau task 23rd

23rd German Association for pattern recognition Symposium, DAGM 2001

作者： Michaelsen, E. Ahlrichs, U. Stilla, U. Paulus, D. Niemann, H. FGAN-FOM Research Institute for Optronics and Pattern Recognition Gutleuthausstr. 1 Ettlingen76275 Germany Universität Erlangen-Nürnberg Martensstr. 3 Erlangen91058 Germany

ISBN: (纸本)3540425969

In this paper, knowledge-based recognition of objects in a bureau scene is studied and compared using two different systems on a common dataset: In the first system active scene exploration is based on semantic networks and an A*-control algorithm which uses color cues and 2-d image segmentation into regions. The other system is based on production nets and uses line extraction and views of 3-d polyhedral models. For the latter a new probabilistic foundation is given. In the experiments, wide-angle overviews are used to generate hypotheses. The active component then takes close-up views which are verified exploiting the knowledge bases, i.e. either the semantic network or the production net. © Springer-Verlag Berlin Heidelberg 2001.

关键词： Semantics

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Fully 3D and joint 2D/3D segmentation of InSAR data over urban environments

Fully 3D and joint 2D/3D segmentation of InSAR data over urb...

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GRSS/ISPRS Joint Workshop on Remote Sensing and Data Fusion over Urban Areas

作者： F. Dell'Acqua P. Gamba U. Soergel U. Thoennessen Department of Electronics University of Pavia Italy Research Institute for Optronics and Pattern Recognition FGAN FOM Ettlingen Germany

ISBN: (纸本)0780370597

Reliable extraction of buildings from InSAR images is made tricky by the many disturbance factors that affect the measurement process, especially in urban areas where the proximity of many different buildings aggravates the problem of multiple reflections. In this paper we propose and discuss two different approaches to segmentation for building extraction.

关键词： Synthetic aperture radar interferometry Layout Urban areas Sensor phenomena and characterization Testing Signal resolution Lighting Buildings Scattering Coherence

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Problems in geometric modelling and perceptual grouping of man-made objects in aerial images 19

Problems in geometric modelling and perceptual grouping of m...

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19th International Congress for Photogrammetry and Remote Sensing, ISPRS 2000

作者： Michaelsen, Eckart Stilla, Uwe FGAN-FOM Research Institute for Optronics and Pattern Recognition EttlingenD 76275 Germany

Structural approaches of pattern recognition are frequently proposed for man-made objects in aerial images. Especially model based methods are considered using geometric, topologic and structural knowledge by means of polyhedral parametric or generic models. We review some aspects of perceptual grouping with respect to these recognition tasks. Emphasis is put on some severe problems encountered in the application. No new results or methods are reported. Instead a qualitative comparison and discussion is given between two such approaches with respect to these problems. Also the importance of associative access techniques is stressed. © 2000 International Society for Photogrammetry and Remote Sensing. All rights reserved.

关键词： Semantics

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Generation of 3D-city models and their utilisation in image sequences 19

Generation of 3D-city models and their utilisation in image ...

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19th International Congress for Photogrammetry and Remote Sensing, ISPRS 2000

作者： Stilla, Uwe Soergel, Uwe Jaeger, Klaus FGAN-FOM Research Institute for Optronics and Pattern Recognition EttlingenD 76275 Germany

In this paper we describe the construction of a city model and its support for the analysis of image sequences. Our city model consists of building models which were generated from large scale vector maps and laser altimeter data. First the vector map is analysed to group the outlines of buildings and to obtain a hierarchical description of buildings or building complexes. The base area of single buildings are used to mask the corresponding elevation data. Depending on the task prismatic or polyhedral object models are reconstructed from the masked elevation data. The interpretation of image sequences taken by an airborne sensor in oblique view can be supported by a 3D city model. Possible GIS applications could be automated overlaying of selected buildings or query detailed building information from a database by interactively pointing on a frame in a sequence. The projection parameters of the model data are derived from GPS and INS. In practice the projected building contours do not exactly coincide with their image location. To overcome this problem an automated matching approach of image and model description is required. After image and vector map analysis correspondences between both scene descriptions can be found. These correspondences are used to correct the navigation data. This approach can easily be extended to image sequences. The corrected navigation data of a frame can be used as prediction for subsequent frames. © 2000 International Society for Photogrammetry and Remote Sensing. All rights reserved.

关键词： Navigation

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Segmentation of laser altimeter data for building reconstruction: Different procedures and comparison 19

Segmentation of laser altimeter data for building reconstruc...

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19th International Congress for Photogrammetry and Remote Sensing, ISPRS 2000

作者： Geibel, Roland Stilla, Uwe FGAN-FOM Research Institute for Optronics and Pattern Recognition EttlingenD 76275 Germany

One important step in the reconstruction of buildings from laser altimeter data is the segmentation step. In this contribution four procedures known from literature are investigated and compared. One procedure, which was made for detecting straight lines, which produces a segmentation as an intermediate result, was used. Three other procedures were installed, which are based on region growing. For each of the procedures experiments with an extensive variation of the parameters were carried out. For the particular task of roof reconstruction and the speciality of height data an own procedure was developed. In this procedure the distance measure is not computed from derived properties but directly from the sets of points. Moreover it also uses the knowledge about the separation of background and foreground and it is regulated by only one parameter. In order to make the segmentation results comparable known comparison measures for single segments (the relative correspondence related to the model and the result) were taken. For the estimation of the whole segmentation several aspects of the evaluation of single segments are discussed and a complete evaluation function is developed. For a quantitative measurement some buildings were chosen as examples. © 2000 International Society for Photogrammetry and Remote Sensing. All rights reserved.

关键词： Remote sensing

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Segmentation of interferometric SAR data for building detection 19

Segmentation of interferometric SAR data for building detect...

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19th International Congress for Photogrammetry and Remote Sensing, ISPRS 2000

作者： Soergel, Uwe Thoennessen, Ulrich Gross, Hermann Stilla, Uwe FGAN-FOM Research Institute for Optronics and Pattern Recognition EttlingenD 76275 Germany

The improved quality of InSAR data suggests to utilise such data for building detection. But, the phase information from which the height data is calculated, is often severely disturbed, depending on the signal to noise ratio. In this paper we refer to investigations to stabilise and improve the InSAR height data. After speckle filtering, a segmentation of the intensity data is carried out. With these segments height data are masked and an average height is calculated using the related intensity values as weights. In a post-processing step, possible existing over- and under-segmentation are corrected. Adjacent objects with similar heights are merged and objects including shadow areas are split. Different tasks are distinguished for utilisation of the derived 3D information. A test site including the airport of Frankfurt (Main) was chosen. For the visualisation purpose, the segmentation result is shown. The results are compared to a vector map and differences are depicted and discussed. © 2000 International Society for Photogrammetry and Remote Sensing. All rights reserved.

关键词： Interferometry

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MAP-AIDED STRUCTURAL-ANALYSIS OF AERIAL IMAGES

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ISPRS JOURNAL OF PHOTOGRAMMETRY AND REMOTE SENSING 1995年第4期50卷 3-10页

作者： STILLA, U Research Institute for Image Processing and Pattern Recognition (FGAN/FIM) Eisenstockstr. 12 76275 Ettlingen Germany

A syntax-oriented method for a map-aided analysis of structures in aerial images is proposed. First the map must be analysed in order to obtain a suitable representation of its knowledge content. A special kind of graph, a so-called image-description graph, is the result of this map analysis. The knowledge of the map, represented on different description levels, is used to control the search process during the image analysis. Based on this knowledge, expectations for attribute values of image objects are defined. Generated objects are assessed relative to the expectations of the map and the object model. A set-oriented selection method is applied to deduce the processing priority using these two assessments. Expected objects are preferably processed for building up more complex objects. Thus the map-aided analysis can be used to reduce the processing time for a verification task.

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Development of a segment-based description of events in image sequences

Development of a segment-based description of events in imag...

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International Conference on pattern recognition

作者： U. Thonnessen D. Ernst H. Gross Research Institute for Information Processing Pattern Recognition FIM/FGAN Germany Res. Inst. for Inf. Processing & Pattern Recognition FIM/FGAN Ettlingen Germany

This paper describes an approach for image sequence processing, which extracts objects (or parts of objects) from the image sequence, generates motion-specifically attributed tracks (location/time course) and derives a hierarchy of motion. The base consists of object-characterizing segments which are determined by a multiple threshold method. This method yields feature descriptions for each segment. Based on this description, an association of the segments from frame to frame is done. The resulting motion vectors are concatenated as long as the features of the segments and the motion-specific attributes do not change significantly. In a subsequent step the analysis of motion-specific interrelations between the tracks is executed. The event recognition is processed and controlled by event models. In conformity with motion concepts the hypotheses of events are initialized by motion dependent changes of the tracks.< >

关键词： Image segmentation Image sequences Tracking Data mining Concatenated codes Layout Information processing pattern recognition Image generation Motion analysis

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An object oriented approach for an iconic kernel system IKS

An object oriented approach for an iconic kernel system IKS

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International Conference on pattern recognition

作者： P. Gemmar G. Hofele Eisenstockstraβe 12 Research Institute for Information Processing and Pattern Recognition (FIM) FGAN e. V. Ettlingen Germany

To provide for the realization of machine-independent image-processing systems which support problem-oriented procedure description and development as well as the generation of reusable software, an iconic kernel system (IKS) was developed. The IKS provides a description foundation for iconic processing and serves as a concrete organizational framework for implementation and application of image-processing tasks. This is achieved using a uniform and comprehensive fundamental operation model for iconic operations and an object-oriented approach for system architecture.< >

关键词： Kernel Image processing pattern recognition Concrete System testing Data structures Information processing Software reusability Application software Object oriented modeling

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AUTOMATING THE PROCESS OF DIGITAL MAP GENERATION

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PHOTOGRAMMETRIA 1985年第2期40卷 155-163页

作者： LUBKOWITZ, R GROCH, WD Forschungsinstitut für Informationsverarbeitung und Mustererkennung (FIM-FGAN) (Research Institute for Information Processing and Pattern Recognition) Eisenstockstr 12 D7505 Ettlingen 6 Germany

An essential step towards the automatic generation of digital maps is the automatic extraction of cartographic features such as roads, highways, railways, rivers, waterways, forest areas, etc. from maps. Several methods have been developed to solve this task. By the analysis of the map legend, the actual parameter values describing the relevant cartographic features can be found automatically. The extraction procedures have been implemented and tested successfully by application to different map master folios. The extraction process has been supported and improved substantially by a simultaneous processing of the map and an aerial image of the same area.

关键词： MAPS AND MAPPING

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