Détail de l'auteur
Auteur Armin W. Gruen |
Documents disponibles écrits par cet auteur (18)
Ajouter le résultat dans votre panier Affiner la recherche Interroger des sources externesUAV flight over Singapore: a pilot study / Armin W. Gruen in Geoinformatics, vol 15 n° 3 (01/04/2012)
Titre : UAV flight over Singapore: a pilot study Type de document : Article/Communication Auteurs : Armin W. Gruen, Auteur Année de publication : 2012 Article en page(s) : pp 34 - 36 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] acquisition d'images
[Termes IGN] chambre CMOS
[Termes IGN] drone
[Termes IGN] modèle 3D de l'espace urbain
[Termes IGN] SingapourRésumé : (Editeur) For the first time Singaporean authorities have given permission for a photogrammetric UAV mapping/modeling flight over an important area of the city. In the context of the SEC-FCL (Future Cities Laboratory) project a pilot study is conducted with the goal to generate a high quality 3D city model of the NUS campus from UAV images. 800 images were needed to cover the area. Data processing is in progress. Numéro de notice : A2012-166 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31613
in Geoinformatics > vol 15 n° 3 (01/04/2012) . - pp 34 - 36[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 262-2012031 SL Revue Centre de documentation Revues en salle Disponible
Titre : Unmanned aerial vehicles: from toys to tools Type de document : Article/Communication Auteurs : Armin W. Gruen, Auteur Année de publication : 2012 Article en page(s) : pp 14 - 16 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] drone
[Termes IGN] image aérienne
[Termes IGN] image aérienne à axe vertical
[Termes IGN] image aérienne obliqueRésumé : (Auteur) Unmanned aerial vehicles (UAVs) have recently attained great attention. This article explains why this is so and describes the wide range of users and applications. But UAVs also have a number of disadvantages, which have to be solved in the future in order to establish a good transition from 'toys to tools'. Numéro de notice : A2012-028 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=31476
in Geoinformatics > vol 15 n° 1 (01/01/2012) . - pp 14 - 16[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 262-2012011 RAB Revue Centre de documentation En réserve L003 Disponible 
Titre : Sensor modeling, self-calibration and accuracy testing of panoramic cameras and laser scanners Type de document : Article/Communication Auteurs : J. Amiri Parian, Auteur ; Armin W. Gruen, Auteur Année de publication : 2010 Article en page(s) : pp 60 - 76 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] auto-étalonnage
[Termes IGN] chambre panoramique
[Termes IGN] étalonnage d'instrument
[Termes IGN] étalonnage de chambre métrique
[Termes IGN] lasergrammétrie
[Termes IGN] modélisation géométrique de prise de vue
[Termes IGN] télémètre laser terrestreRésumé : (Auteur) Terrestrial Linear Array CCD-based panoramic cameras have been used for purely imaging purposes, but they also have a high potential for use in high accuracy measurement applications. The imaging geometry and the high information content of those images make them suitable candidates for quantitative image analysis. For that a particular sensor model has to be established and the inherent accuracy potential has to be investigated. We developed a sensor model for terrestrial Linear Array-based panoramic cameras by means of a modified bundle adjustment with additional parameters, which models substantial deviations of a real camera from the ideal one. We used 3D straight-line information in addition to tie points to conduct a full calibration and orientation without control point information. Due to the similarity of the operation of laser scanners to panoramic cameras the sensor model of the panoramic cameras was extended for the self-calibration of laser scanners. We present the joint sensor model for panoramic cameras and laser scanners and the results of self-calibration, which indicate a subpixel accuracy level for such highly dynamic systems. Finally we demonstrate the systems’ accuracy of two typical panoramic cameras in 3D point positioning, using both a minimal number of control points and a free network adjustment. With these new panoramic imaging devices we have additional powerful sensors for image recording and efficient 3D object modeling. Numéro de notice : A2010-230 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2009.08.005 En ligne : https://doi.org/10.1016/j.isprsjprs.2009.08.005 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30424
in ISPRS Journal of photogrammetry and remote sensing > vol 65 n° 1 (January - February 2010) . - pp 60 - 76[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 081-2010011 SL Revue Centre de documentation Revues en salle Disponible
Titre : Comparative geometric and radiometric evaluation of mobile phone and still video cameras Type de document : Article/Communication Auteurs : Devrim Akca, Auteur ; Armin W. Gruen, Auteur Année de publication : 2009 Article en page(s) : pp 217 - 245 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] analyse comparative
[Termes IGN] auto-étalonnage
[Termes IGN] bruit (théorie du signal)
[Termes IGN] caméra vidéo
[Termes IGN] fonction de transfert de modulation
[Termes IGN] précision géométrique (imagerie)
[Termes IGN] précision radiométrique
[Termes IGN] téléphonie mobileRésumé : (Auteur) This paper examines the potential of mobile phones to be used as front-end sensors for photogrammetric procedures and applications. For this purpose, two mobile phone cameras (Sony Ericsson K750i and Nokia N93) were calibrated over an indoor 3D testfield, using a self-calibrating bundle adjustment. Geometric accuracy tests were carried out in order to evaluate their metric performances and to compare the results with respect to two off-the-shelf digital still video cameras (Sony DSC W100 and Sony DSC F828). The geometric accuracy evaluation comprised an absolute accuracy test, JPEG test and temporal stability test. The radiometric capabilities of all cameras (except that the DSC W100 was replaced with a DSC T100 camera) were also evaluated and compared by carrying out modulation transfer function (MTF) analysis, image noise analysis and an operating range test. Substantial systematic errors were diagnosed in some systems. However, with proper calibration it is believed that these devices can be used for many photogrammetric tasks. Copyright RS&PS + Blackwell Publishing Numéro de notice : A2009-327 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.1111/j.1477-9730.2009.00541.x En ligne : https://doi.org/10.1111/j.1477-9730.2009.00541.x Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=29957
in Photogrammetric record > vol 24 n° 127 (September - November 2009) . - pp 217 - 245[article]Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 106-09031 RAB Revue Centre de documentation En réserve L003 Disponible Sensor modelling and validation for linear array aerial and satellite imagery / Sultan Aksakal Kocaman (2009)
Titre : Sensor modelling and validation for linear array aerial and satellite imagery Type de document : Thèse/HDR Auteurs : Sultan Aksakal Kocaman, Auteur ; Armin W. Gruen, Directeur de thèse ; Christian Heipke, Directeur de thèse Editeur : Zurich : Institut für Geodäsie und Photogrammetrie IGP - ETH Année de publication : 2009 Collection : IGP Mitteilungen, ISSN 0252-9335 num. 106 Importance : 166 p. Format : 21 x 30 cm ISBN/ISSN/EAN : 978-3-906467-88-7 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s)
[Termes IGN] ADS40
[Termes IGN] capteur aérien
[Termes IGN] capteur en peigne
[Termes IGN] capteur linéaire
[Termes IGN] capteur optique
[Termes IGN] capteur spatial
[Termes IGN] compensation par faisceaux
[Termes IGN] détecteur à transfert de charge
[Termes IGN] étalonnage de capteur (imagerie)
[Termes IGN] image ALOS-PRISM
[Termes IGN] modèle géométrique de prise de vue
[Termes IGN] modélisation géométrique de prise de vue
[Termes IGN] orientation du capteur
[Termes IGN] Panchromatic Remote Sensing Instrument for Stereo Mapping
[Termes IGN] pouvoir de résolution géométriqueIndex. décimale : 35.13 Prises de vues par capteurs spatiaux Résumé : (Auteur) The Linear Array CCD technology is widely used in the new generation aerial photogrammetric sensors and also in the high-resolution satellite optical sensors. In comparison to the Matrix (frame/area) Array sensors, the Linear Array CCD sensors have smaller number of detectors to cover the same swath width. In addition, the flexibility is higher in the physical sensor design. The conventional film cameras used in aerial photogrammetry are manufactured in frame format. The first remote sensing sensors for Earth observation employed film cameras as well. The recent sensor technologies of the optical remote sensing satellites are replaced with the Linear Array CCDs. In case of the aerial photogrammetric sensors, medium and small format aerial cameras are produced only in the frame format. The development in large format cameras is twofold. The Linear Array CCD and Matrix Array CCD sensors have been present in the industry since the year 2000.
Due to the geometric differences between the Linear Array cameras and the frame cameras, the conventional photogrammetric procedures for the geometric processing of the Linear Array CCD images should be redefined or newly developed. The trajectory modeling is one of the main concepts, which entered into the field of photogrammetry with the aerial and satellite pushbroom sensors. The modified collinearity equations are extended with mathematical functions to model the image trajectory in the bundle adjustment. This study encompasses the triangulation of Linear Array CCD images with the use of different trajectory models. The self-calibration models are partially adapted from the frame sensors in accordance with the physical structures of the Linear Array CCD sensors.
In general, the triangulation and self-calibration of the aerial and the satellite Linear Array CCD images show similarities in terms of trajectory modeling and the physical definitions of the additional parameters. The main difference is in the number unknown parameters defined in the bundle adjustment, which is calculated as a function of the number of lenses, the trajectory model configuration, and the number of Linear Array CCDs used in the sensor. Therefore, similar sensor modeling and calibration approaches are applied in this study, with necessary adjustments for each system.
In order to obtain high accuracy point positioning, high quality image trajectory measurement is crucial. The given trajectory can be modeled in the adjustment by using constant and linear correction parameters, as well as higher order polynomials. This study investigates the three different trajectory models with three different mathematical approaches. Two of the models are investigated at different levels of sophistication by altering the model parameters.
Two different aerial Linear Array CCD sensors, the STARIMAGER of former Starlabo Corporation, Japan, and the ADS40 sensor of the Leica Geosystems, Heerbrugg, are used for the practical investigations. The PRISM (Panchromatic Remote-sensing Instrument for Stereo Mapping) onboard of Japanese ALOS satellite launched by JAXA (Japan Aerospace Exploration Agency) in 2006 is the satellite Linear Array CCD sensor used for the application parts of this study. The two aerial Linear Array CCD sensors work with the TLS (Three-Line-Scanner) principle. Three or more Linear Array CCDs are located in the focal plane of a single lens with different viewing angles providing stereo capability. The PRISM sensor differs in the optical design with three camera heads, each associated with a different viewing angle.
Due to the design differences between the sensors, two sets of additional 'parameters for self-calibration are applied in this study. The aerial TLS sensors share the same set of additional parameters due to similar interior geometries of the sensors. The self-calibration of the PRISM sensor uses a different set due to multiple lenses and also multiple CCD chips used to form each image line.
The sensor orientation and calibration methods presented in this study are validated using a number of application datasets. The image datasets of the three sensors are acquired over specially established testfields. Triangulation results prove the importance of high quality trajectory measurements for accurate sensor orientation. When the given image trajectory has a low quality, a sophisticated trajectory model should be used together with a high number of ground control points.
This study also shows that, despite their weaker sensor geometry, the Linear Array CCD sensors have reached the accuracy potential of the conventional frame imagery for point determination. In addition, similar to the conventional film sensors, self-calibration has proven as a powerful tool for modeling the systematic errors of the Linear Array CCD imagery, albeit the method should be applied with a great care.Note de contenu : 1 Introduction
1.1 Research Objectives
1.2 Review of Digital Optical Sensors
1.2.1 Point-based Sensors
1.2.2 Linear Array CCD Sensors
1.2.3 Frame Array CCD Sensors
1.3 Review of Sensor Calibration Approaches for Linear Array CCD Sensors
1.4 Review of Sensor Orientation Methods for Linear Array CCD Sensors
1.4.1 Direct vs. Indirect Georeferencing
1.4.2 Rigorous vs. Generic Models for Georeferencing
1.5 Quality Analysis and Validation for the Geometric Processing Methods
1.6 Outline
2 Characterizations of the Linear Array CCD Sensor Geometries
2.1 Optical System Specification
2.2 Line Geometry
2.3 Resolution Specification
2.3.1 Spatial Resolution
2.3.2 Radiometric Resolution
2.3.3 Spectral Resolution
2.3.4 Temporal Resolutions of Satellite Sensors
2.4 Operation Principles
2.4.1 Sensor and Platform Synchronization
2.4.2 Stereo Acquisition
2.4.3 Platform Stabilization
3 Calibration Parameters for the Linear Array CCD Sensors .
3.1 Optical System Related Parameters
3.1.1 Principal Point Displacement
3.1.2 Camera Constant
3.1.3 Lens Distortions
3.2 CCD Line Related Parameters
3.2.1 Scale effect
3.2.2 Rotation
3.2.3 Displacement from the Principal Point
3.2.4 Bending
4 Methodology for Sensor Orientation and Calibration
4.1 Preparation for Rigorous Sensor Orientation
4.1.1 Image Trajectory Extraction
4.1.2 Interior Orientation Extraction
4.1.3 Coordinate System Transformations
4.2 Rigorous Sensor Orientation
4.2.1 Modified Bundle Adjustment with Trajectory Modeling
4.2.2 Self-calibration Method
4.2.3 Weighting Scheme of the Bundle Adjustment
4.2.4 Accuracy Assessment of the Bundle Adjustment
4.2.5 Processing time
5 Applications
5.1 Starlmager Sensor
5.1.1 Applications over the Yoriichio Testfield, Japan
5.1.2 Findings and Discussion
5.2 ADS40 Sensor
5.2.1 Applications to Testfields
5.2.2 Findings and Discussion
5.3 The ALOS/PRISM Sensor
5.3.1 Introduction
5.3.2 Applications to Testfields
5.3.3 Findings and Discussion
6 Conclusions and Outlook
6.1 Summary
6.2 Conclusions
6.3 Recommendations for Future WorkNuméro de notice : 15509 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Thèse étrangère En ligne : http://dx.doi.org/10.3929/ethz-a-005780510 Format de la ressource électronique : URL Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=62742 Exemplaires(1)
Code-barres Cote Support Localisation Section Disponibilité 15509-01 35.13 Livre Centre de documentation En réserve M-103 Disponible PermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalinkPermalink
