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检索条件"任意字段=3rd Conference on Integrating Photogrammetric Techniques with Scene Analysis and Machine Vision"

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Processing of 3-line imagery on a digital photogrammetric workstation

Processing of 3-line imagery on a digital photogrammetric wo...

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3rd conference on integrating photogrammetric techniques with scene analysis and machine vision

作者： Brand, R Ohlhof, T Stephani, M Technische Univ. Muenchen (Germany)

ISBN: (纸本)0819424870

One of the main topics in photogrammetry is the development of automatic processing techniques, e.g. for aerotriangulation and stereo restitution, both starting from digital aerial imagery. On the other hand digital cameras and sensors gain more and more importance. One of the most promising sensor concept makes use of three linear CCD arrays. This paper deals with the special geometry of 3-line imagery and the consequences for the processing on a digital photogrammetric workstation.

关键词： digital photogrammetric workstations 3-line imagery stereo restitution MOMS-02

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Map feature examination of RADARSAT for geospatial utility and imagery enhancement opportunities

Map feature examination of RADARSAT for geospatial utility a...

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3rd conference on integrating photogrammetric techniques with scene analysis and machine vision

作者： Duncan, G Heidbreder, W Hammack, J Szpak, C NIMA (United States)

ISBN: (纸本)0819424870

This paper discusses multisensor tests conducted to examine the geospatial information potential of RADARSAT imagery. The focus of the tests will be to develop a metric for determining which map features present in optical or radar imagery could benefit from the use of multisensor enhancement techniques. Visual and geospatial differences between optical and radar imagery will be studied. Data collection and analysis will be based on a Product-Source Prediction Capability (PSPC) and other related modeling and analysis tools.

关键词： verification techniques geospatial information content PSPC multisensor enhancement heuristics

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Structural matching for non-metric images

Structural matching for non-metric images

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3rd conference on integrating photogrammetric techniques with scene analysis and machine vision

作者： Wang, YI Univ. of Hannover (Germany)

ISBN: (纸本)0819424870

Image matching is a basic issue in computer vision and in digital photogrammetry. For non-metric images the area based and the feature based matching methods are not so suitable as for aerial images, because there is usually no initial values available. In this paper a structure based image matching method is introduced, which can recognize the corresponding image objects fully automatically without to know any a priori information and without to have any relation assumptions about the digital images. Some examples for the application of this matching method to the non-metric images in close range photogrammetry and to the SPOT and MOMS remote sensed images are demonstrated. The results show that the highest automation level of image matching have been reached with the developed method.

关键词： image matching algorithms structural matching photogrammetry vision automation

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Processes to support error estimation for model supported positioning

Processes to support error estimation for model supported po...

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3rd conference on integrating photogrammetric techniques with scene analysis and machine vision

作者： Ely, R Lundgren, J Mueller, W Texas Instruments Inc. (United States) GDE Systems Inc. (United States)

ISBN: (纸本)0819424870

The Model Supported Positioning project was initiated to develop an automatic process for the control of imagery. Imagery is controlled using a rigorous photogrammetric process to adjust the image support data. Because the process of locating the control in the image and adjusting the image support data is fully automatic, processes must be put in place to insure adequate distribution of control in the image as well a capability to check the an accuracy resultant controlled imagery. Additionally, since the control is located in the image using an automatic vector to image matching technique, a process must be put in place to assess the accuracy of the measured point in the image. This paper address the approaches taken to incorporate these processes within the Model Supported Positioning prototype.

关键词： Image processing Image registration Databases Error analysis Process control Prototyping Data modeling Sensors Control systems Data processing

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Improving reconstruction of man-made objects from sensor images by machine learning

Improving reconstruction of man-made objects from sensor ima...

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3rd conference on integrating photogrammetric techniques with scene analysis and machine vision

作者： Englert, R Cremers, AB Univ. Bonn (Germany)

ISBN: (纸本)0819424870

In this paper we present a new approach for the acquisition and analysis of background knowledge which is used for 3D reconstruction of man-made objects - in this case buildings. Buildings can be easily represented as parameterized graphs from which p-subisomorphic graphs will be computed. P-graphs will be defined and an upper bound complexity estimation of the computation of p-subisomorphims will be given. In order to reduce search space we will discuss several pruning mechanisms. Background knowledge requires a classification in order to receive a probability distribution which will serve as a priori knowledge for 3D building reconstruction. Therefore, we will apply an alternative view of nearest-neighbor classification to measured knowledge in order to learn based on a complete seed and a noise model a distribution of this knowledge. An application of an extensive scene consisting of 1846 building cluster which are represented as p-graphs in order to estimate a probability distribution of corner nodes demonstrates the effectiveness of our approach. An evaluation using the information coding theory determines the information gain which is provided by the estimated distribution in comparison with no available a priori knowledge.

关键词： object reconstruction machine learning graph theory generic scene knowledge semantic modeling statistical analysis information coding theory upper bound complexity estimation

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A 3-D approach for semiautomatic extraction of man-made objects from large-scale aerial images

A 3-D approach for semiautomatic extraction of man-made obje...

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3rd conference on integrating photogrammetric techniques with scene analysis and machine vision

作者： Krupnik, A Topel, L Sahar, L Department of Civil Engineering Technion Israel Institute of Technology Haifa 32000 Israel

ISBN: (纸本)0819424870

1`Automatic identification and extraction of man-made objects from aerial images for cartographic purposes are currently the most challenging problems in photogrammetry. Automating the identification and extraction procedures can significantly improve the efficiency of photogrammetric tasks, such as map compilation, DSM and orthophoto generation and city modeling. This paper presents an approach for object extraction from large-scale aerial images. The approach comprises two key concepts: extraction is performed from the object view point, and objects are extracted semiautomatically. Integration of both concepts in a conventional, well-established photogrammetric procedure complies with the primary requirement of the mapping community, which is to have an efficient procedure, while maintaining the necessary accuracy and reliability. The paper presents the idea and the motivations, and discusses basic tools for extracting two types of common man-made objects: buildings and roads. Preliminary results are shown and discussed as well.

关键词： aerial images large scale digital photogrammetry object extraction roads buildings

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Preliminary results on the analysis of HYDICE data for information fusion in cartographic feature extraction

Preliminary results on the analysis of HYDICE data for infor...

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3rd conference on integrating photogrammetric techniques with scene analysis and machine vision

作者： Ford, SJ Kalp, D McGlone, JC McKeown, DM Carnegie Mellon Univ. (United States)

ISBN: (纸本)0819424870

This paper discusses ongoing research in the analysis of airborne hyperspectral imagery with application to cartographic feature extraction and surface material attribution. Preliminary results, based upon the processing and analysis of hyperspectral data acquired by the Naval Research Laboratory's (NRL) Hyperspectral Digital Imagery Collection Experiment (HYDICE) over Fort Hood, Texas in late 1995, are shown. Significant research issues in geopositioning, multisensor registration, spectral analysis, and surface material classification are discussed. The research goal is to measure the utility of hyperspectral imagery acquired with high spatial resolution (2 meter GSD) to support automated cartographic feature extraction. Our hypothesis is that the addition of a hyperspectral dataset, with spatial resolution comparable to panchromatic mapping imagery, enables opportunities to exploit the inherent spectral information of the hyperspectral imagery to aid in urban scene analysis for cartographic feature extraction and spatial database population. Test areas selected from the Fort Hood dataset will illustrate the process flow and serve to show current research results.

关键词： HYDICE airborne hyperspectral linear pushbroom sensor photogrammetry cartographic feature extraction surface material classification

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Comparative analysis of hierarchical Triangulated Irregular Networks to represent 3D elevation in terrain databases

Comparative analysis of hierarchical Triangulated Irregular ...

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3rd conference on integrating photogrammetric techniques with scene analysis and machine vision

作者： Abdelguerfi, M Wynne, C Cooper, E Ladner, R Shaw, K Univ. of New Orleans (United States) Naval Research Lab. (United States)

ISBN: (纸本)0819424870

3D terrain representation plays an important role in a number of terrain database applications. Hierarchical Triangulated Irregular Networks (TINs) provide a variable-resolution terrain representation that is based on a nested triangulation of the terrain. This paper compares and analyzes existing hierarchical triangulation techniques. The comparative analysis takes into account how aesthetically appealing and accurate the resulting terrain representation is. Parameters, such as adjacency, slivers, and streaks, are used to provide a measure on how aesthetically appealing the terrain representation is. Slivers occur when the triangulation produces thin and slivery triangles. Streaks appear when there are too many triangulations done at a given vertex. Simple mathematical expressions are derived for these parameters, thereby providing a fairer and a more easily duplicated comparison. In addition to meeting the adjacency requirement, an aesthetically pleasant hierarchical TINs generation algorithm is expected to reduce both slivers and streaks while maintaining accuracy. A comparative analysis of a number of existing approaches shows that a variant of a method originally proposed by Scarlatos exhibits better overall performance.

关键词： triangulated irregular networks (TINs) hierarchical TINs sliveriness streakiness terrain databases 3D elevation DTED VPF digital mapping

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MOMS-02/D2 DTM generation using intensity based least squares matching techniques

MOMS-02/D2 DTM generation using intensity based least square...

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3rd conference on integrating photogrammetric techniques with scene analysis and machine vision

作者： Fritsch, D Kiefner, M Schneider, F Univ. Stuttgart (Germany)

ISBN: (纸本)0819424870

The optical MOMS02 three-line imaging camera provided stereo data in a resolution of 13.5 m and 4.5 m during the 2nd German Spacelab (D2) experiment on-board the Space-Shuttle within the flight STS55 from April 26 to May 6, 1993. For the verification of the stereo module, digital terrain models are derived by photogrammetric image matching techniques using intensity based and feature based methods, respectively. These verifications concentrate on two test sites, for which ground control points are available. The paper presents a comparison of the matching results when area based and feature based methods are used for automatic DTM generation. It is interesting, that the accuracy level could be increased by a factor of 2, if area based image matching is used for the point transfer computation. This improvement in accuracy is verified in both test sites: the Australian and the Andes test site. Furthermore, the last part of the paper presents first experimental results of a simulation for the matching of three channels of different pixel resolution, to come very close to the MOMS-02 architecture.

关键词： Image resolution Cameras Photogrammetry Remote sensing Associative arrays Data acquisition Pixel resolution Computer architecture Sensors Stereoscopic cameras

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Triangulated irregular network (TIN) representation quality as a function of source data resolution and polygon budget constraints

Triangulated irregular network (TIN) representation quality ...

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3rd conference on integrating photogrammetric techniques with scene analysis and machine vision

作者： Richbourg, R Stone, T Institute for Defense Analyses (United States)

ISBN: (纸本)0819424870

High resolution digital elevation models (DEM) are becoming increasingly available for use as source data during the process of creating synthetic environments to support simulation systems. Several data sets that provide elevation points corresponding to 1 meter intervals on the earth surface are now available, However, multiple transformations must often be applied to the raw source data before it is suitable for use by any simulation system. These transformations have an impact on the fidelity of the final (simulation) synthetic environment that is difficult to quantify. Further, intuition alone now supports any claim that higher resolution source data necessarily results in generation of higher fidelity simulation data as a product of the transformation process. This paper documents an attempt to measure fidelity differences in final simulation synthetic environments that can be directly attributed to the resolution of the source data. Specifically, several lower resolution DEM are generated from a single high resolution (1 meter horizontal spacing) source DEM and all are used as source data for TIN construction. Automated planning software is applied to each and used as a metric to measure TIN quality.

关键词： TIN DEM automated planning DEM resolution visibility analyses automated terrain analysis TIN metrics

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