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Image restoration for resolution improvement of digital aerial images: a comparison of large format digital cameras / S. Becker in Revue Française de Photogrammétrie et de Télédétection, n° 183 (Septembre 2006)  

Public [article]  inRevue Française de Photogrammétrie et de Télédétection > n° 183 (Septembre 2006) . - pp 5 - 10 Titre : Image restoration for resolution improvement of digital aerial images: a comparison of large format digital cameras Type de document : Article/Communication Auteurs : S. Becker, Auteur ; Norbert Haala, Auteur ; et al., Auteur Année de publication : 2006 Conférence : ISPRS 2006, Commission 1 Symposium, From sensors to imagery 03/07/2006 06/07/2006 Champs-sur-Marne [Paris Marne-la-Vallée] France OA ISPRS Archives Article en page(s) : pp 5 - 10 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] accentuation de contours [Termes IGN] ADS40 [Termes IGN] analyse comparative [Termes IGN] caméra numérique [Termes IGN] chambre à grand format [Termes IGN] cohérence des couleurs [Termes IGN] DMC [Termes IGN] image aérienne [Termes IGN] image numérique [Termes IGN] instrumentation Z/I Imaging [Termes IGN] pansharpening (fusion d'images) [Termes IGN] restauration d'image [Termes IGN] tâche image d'un point [Termes IGN] UltraCam Résumé : (Auteur) Within the paper a comparative quantification of the spatial image resolution for large-format digital airborne cameras will be presented. For this purpose, imagery of the Leica ADS40, the Intergraph Z/I-imaging DMC and the Vexcel UltraCamD were examined. The respective spatial resolutions are represented by means of the point spread function, which can be measured easily and reliably at image edges. Thus, images of test patterns like a Siemens star were used. In addition to the evaluation of the original images as they are provided by the camera systems, the potential benefit of a resolution improvement by image restoration is demonstrated. Therefore, a linear restoring finite impulse response filter is applied. Usually, colour image acquisition by digital aerial camera systems is realised by combining data from the multi-spectral module with higher resolution panchromatic imagery. The quality of this pan-sharpening process is presented in the final part of the paper. For this purpose, the potential degradation of colour information by this process was quantified for the three tested camera systems in addition to the resolution measurements. Copyright SFPT Numéro de notice : A2006-625 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueNat DOI : sans En ligne : https://www.isprs.org/proceedings/XXXVI/part1/Papers/T01-03.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28348 [article]

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Evaluation of resolving power and MTF of DMC / Eija Honkavaara in Revue Française de Photogrammétrie et de Télédétection, n° 183 (Septembre 2006)  

Public [article]  inRevue Française de Photogrammétrie et de Télédétection > n° 183 (Septembre 2006) . - pp 17 - 22 Titre : Evaluation of resolving power and MTF of DMC Type de document : Article/Communication Auteurs : Eija Honkavaara, Auteur ; Juha Jaakkola, Auteur ; et al., Auteur Année de publication : 2006 Conférence : ISPRS 2006, Commission 1 Symposium, From sensors to imagery 03/07/2006 06/07/2006 Champs-sur-Marne [Paris Marne-la-Vallée] France OA ISPRS Archives Article en page(s) : pp 17 - 22 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image optique [Termes IGN] chambre à grand format [Termes IGN] distorsion d'image [Termes IGN] DMC [Termes IGN] fonction de transfert de modulation [Termes IGN] image panchromatique [Termes IGN] instrumentation Z/I Imaging [Termes IGN] pas d'échantillonnage au sol [Termes IGN] pouvoir de résolution géométrique Résumé : (Auteur) The present article reports the results of an extensive empirical evaluation of spatial resolution of a digital large format Intergraph DMC sensor. The parameters of the study were flight direction, ground sample distance (GSD) and the distance from the image center. The key finding of the study was that the resolution of the DMC panchromatic large-format image was clearly dependent on the distance from the image center. One reason for this behavior is that the DMC large-format image is composed of four oblique images; the resolution of the oblique images is reduced towards the image border due to the scale reduction and projective distortion. From the image pixel size of 12 um of DMC, a nominal resolving power value (RP) 84 lines/mm can be derived. Maximal resolution reduction factors in the image comers, caused by the image tilt, were 1.6 in the cross-flight direction and 1.4 in the flight direction. The distance from the image center did not appear to affect the resolution of the low-resolution multi-spectral images looking towards nadir. The observed MTFs indicated attractive behavior. The A WAR values of the panchromatic images were between 61 and 71 lines/mm, which is 1.2-1.4 times the nominal RP-value. Other important findings were the effects of GSD and flight direction on the resolution; these properties evidently characterize the behavior of the entire photogrammetric system tested. The image restoration by a linear restoring finite impulse response filter provided a constant resolution improvement factor of 1.4. Copyright SFPT Numéro de notice : A2006-626 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueNat DOI : sans En ligne : https://www.isprs.org/proceedings/XXXVI/part1/Papers/PS3-39.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28349 [article]

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Evaluation of digital aerial sensors in an operational mapping environment / B.P. Olsen in Revue Française de Photogrammétrie et de Télédétection, n° 183 (Septembre 2006)  

Public [article]  inRevue Française de Photogrammétrie et de Télédétection > n° 183 (Septembre 2006) . - pp 23 - 28 Titre : Evaluation of digital aerial sensors in an operational mapping environment Type de document : Article/Communication Auteurs : B.P. Olsen, Auteur ; T. Knudsen, Auteur ; et al., Auteur Année de publication : 2006 Conférence : ISPRS 2006, Commission 1 Symposium, From sensors to imagery 03/07/2006 06/07/2006 Champs-sur-Marne [Paris Marne-la-Vallée] France OA ISPRS Archives Article en page(s) : pp 23 - 28 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Applications photogrammétriques [Termes IGN] base de données localisées [Termes IGN] image aérienne [Termes IGN] infrastructure nationale des données localisées [Termes IGN] intégration de données [Termes IGN] modèle numérique de surface [Termes IGN] orthophotographie [Termes IGN] photogrammétrie numérique [Termes IGN] qualité des données Résumé : (Auteur) We summarize the procedures and preliminary conclusions from an inter-institutional project group evaluating the feasibility (economically and practically) for introducing digital aerial imagery into the work flow used in connection with maintenance of a national map database. Not surprisingly, the main conclusion is that "it depends...": there are in many cases good technical reasons for switching, but the final decision must depend heavily on the price level of the digital vs. the analogue imagery. In a few years time we expect that digital imagery will be much more widespread than analogue. Numéro de notice : A2006-627 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueNat DOI : sans En ligne : https://www.isprs.org/proceedings/XXXVI/part1/Papers/PS3-36.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28350 [article]

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Is there an ideal digital aerial camera? / Jean-Philippe Souchon in Revue Française de Photogrammétrie et de Télédétection, n° 183 (Septembre 2006)    

Public [article]  contenu dans ISPRS Commission 1 Symposium 2006, Paris, Marne-la-Vallée, 3-6 Juillet 2006: Des capteurs à l'imagerie, vol 1. Proceedings / Alain Baudoin (2006)   inRevue Française de Photogrammétrie et de Télédétection > n° 183 (Septembre 2006) . - pp 29 - 34 Titre : Is there an ideal digital aerial camera? Type de document : Article/Communication Auteurs : Jean-Philippe Souchon , Auteur ; Olivier Martin , Auteur ; Nicolas Paparoditis , Auteur ; et al., Auteur Année de publication : 2006 Conférence : ISPRS 2006, Commission 1 Symposium, From sensors to imagery 03/07/2006 06/07/2006 Champs-sur-Marne [Paris Marne-la-Vallée] France OA ISPRS Archives Article en page(s) : pp 29 - 34 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] ADS40 [Termes IGN] analyse comparative [Termes IGN] caméra numérique [Termes IGN] chambre à grand format [Termes IGN] DMC [Termes IGN] instrumentation IGN [Termes IGN] UltraCam Résumé : (Auteur) The IGN digital camera project was set up in the early 90's and the first research surveys were carried out in 1996. The digital camera was first used in production in 2000 when the DMC and ADS40 systems appeared on the market at the beginning of the 21st century. Since then, two medium format systems (Applanix DSS322 and DiMAC system) and a third large-format system (Vexcel UltraCamD) appeared on the surveying market. Today, IGN's system could appear very underperforming in terms of possible swaths and frame rates compared with the ones offered by large format cameras ; and parts of our electronics have become obsolete. This is the reason why we recently reanalyzed the needs of IGN in term of digital imagery and confronted them to the main characteristics and capabilities of the different existing commercial systems. Considering that Bayer acquisition without a coupled panchromatic acquisition does not allow an image reconstruction of good quality and considering that an acquisition system based on CCD area sensors must be equipped with a Forward Motion Compensation (FMC) able to compensate dozens of pixels, we only focused on the three large-format systems that are : Intergraph's DMC, Vexcel's UltracamD, and Leica Geosystems' ADS40. Each of these three systems has its pros and cons and no one seems to bring an answer to all our needs. Copyright SFPT Numéro de notice : A2006-628 Affiliation des auteurs : LOEMI (1985-2011) Thématique : IMAGERIE Nature : Article DOI : sans En ligne : https://www.isprs.org/proceedings/XXXVI/part1/Papers/PS3-45.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28351 [article]

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Documents numériques

en open access Is there an ideal... - pdf éditeur ISPRS Adobe Acrobat PDF

Calibration and validation of digital airborne cameras / P. Boccardo in Revue Française de Photogrammétrie et de Télédétection, n° 183 (Septembre 2006)

Public [article]  inRevue Française de Photogrammétrie et de Télédétection > n° 183 (Septembre 2006) . - pp 50 - 55 Titre : Calibration and validation of digital airborne cameras Type de document : Article/Communication Auteurs : P. Boccardo, Auteur ; Michael Cramer, Auteur Année de publication : 2006 Article en page(s) : pp 50 - 55 Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] assurance qualité [Termes IGN] caméra numérique [Termes IGN] capteur aérien [Termes IGN] capteur imageur [Termes IGN] certification [Termes IGN] étalonnage de chambre métrique [Termes IGN] image aérienne Résumé : (Auteur) With the growing use of digital airborne imagers in daily operational data acquisition and processing the need for the development of guidelines and procedures for quality assurance and quality control is clearly obvious. Several national and international organizations are dealing with those topics, where focus is laid on the calibration, validation and certification of the new sensors. As an example the activities from USGS (United States) and EuroSDR (Europe) are presented within this article. Since both projects are still under current processing, only an overview and snap-shot of the status and preliminary results are given. Copyright SFPT Numéro de notice : A2006-629 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueNat DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28352 [article]

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Tests and performance evaluation of DMC images and new methods for their processing / Li Zhang in Revue Française de Photogrammétrie et de Télédétection, n° 183 (Septembre 2006)

Public [article]  inRevue Française de Photogrammétrie et de Télédétection > n° 183 (Septembre 2006) . - pp 67 - 74 Titre : Tests and performance evaluation of DMC images and new methods for their processing Type de document : Article/Communication Auteurs : Li Zhang, Auteur ; S. Kocaman, Auteur ; et al., Auteur Année de publication : 2006 Conférence : ISPRS 2006, Commission 1 Symposium, From sensors to imagery 03/07/2006 06/07/2006 Champs-sur-Marne [Paris Marne-la-Vallée] France OA ISPRS Archives Article en page(s) : pp 67 - 74 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] chambre DTC [Termes IGN] DMC [Termes IGN] image aérienne [Termes IGN] image numérique [Termes IGN] point d'appui [Termes IGN] points homologues [Termes IGN] précision géométrique (imagerie) [Termes IGN] test de performance [Termes IGN] traitement d'image [Termes IGN] valeur radiométrique Résumé : (Auteur) The Cartographic Institute of Catalonia (ICC) has acquired a DMC digital camera and has performed some first investigations regarding radiometric performance and geometric accuracy potential. In this cooperation with the Institute of Geodesy and Photogrammetry (IGP), ETH Zurich various aspects are analysed. The investigations make use of recent test flights near Tortosa, a plane region with varying landcover. For the quantitative analysis of the DMC results, a ground control points and lidar data exist, which have been simultaneously acquired with the DMC images. The first part of the investigations focusses on geometric sensor modeling and aerial triangulation. Preliminary results of ICC have shown that when standard additional parameters, like the 12 Ebner parameters, are used in AT, significant systematic errors remain and each of the 4 subimages that form the virtual panchromatic image has a different pattern of image deformations. In these investigations, we do not perform analysis of additional parameters in order to model these deformations, as this has been done in another ICC work. The results are analysed using GCPs established in the above mentioned testfield, using two different bundle adjustment programs.. Another part of our investigations regarding AT deals with automatic point transfer using a high quality multi-image, multi-primitive matching method developed at IGP, initially for automatic DSM generation. Different aspects like number, distribution and accuracy of the tie points are analysed, as well number of rays per tie point. The second part of the paper focuses on automatic DSM generation. Although digital cameras offer characteristics, like better image quality, that could be used favourably in automated DSM generation, almost all commercial systems employ matching methods with limitations, like no support of multi-image matching. In these investigations, we briefly introduce the above mentioned IGP multi-image matching and present the matching results. Initial results with other digital cameras and images with large forward and side overlap have shown that this matching approach can produce DSMs at least as dense as those produced by airborne laser scanning and almost as accurate, preserving also very well surface discontinuities. The processing and DSM control was performed by IGP using lidar data provided by ICC, while ICC made an independent control of the aerial triangulation using the software programs at ICC. Copyright SFPT Numéro de notice : A2006-630 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : sans Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28353 [article]

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Geometric validation of imagery and products from a high performance airborne digital sensor / Jon P. Mills in Revue Française de Photogrammétrie et de Télédétection, n° 183 (Septembre 2006)  

Public [article]  inRevue Française de Photogrammétrie et de Télédétection > n° 183 (Septembre 2006) . - pp 81 - 85 Titre : Geometric validation of imagery and products from a high performance airborne digital sensor Type de document : Article/Communication Auteurs : Jon P. Mills, Auteur ; S. Alhamlan, Auteur ; et al., Auteur Année de publication : 2006 Conférence : ISPRS 2006, Commission 1 Symposium, From sensors to imagery 03/07/2006 06/07/2006 Champs-sur-Marne [Paris Marne-la-Vallée] France OA ISPRS Archives Article en page(s) : pp 81 - 85 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] ADS40 [Termes IGN] ALTM [Termes IGN] compensation par bloc [Termes IGN] compensation par faisceaux [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] géoréférencement [Termes IGN] image aérienne [Termes IGN] modèle numérique de surface [Termes IGN] point d'appui [Termes IGN] précision géométrique (imagerie) [Termes IGN] qualité géométrique (image) Résumé : (Auteur) This paper describes a geometric evaluation of the photogrammetric workflow resulting from an experimental aerial survey performed using a Leica Airborne Digital Sensor (ADS40) system. Imagery of a 13 km2 study area in the United Kingdom was captured using an ADS40. The study area was flown with the ADS40 at four different altitudes with resulting imagery at ground sampled distances of 15, 20, 25 and 30 cm. Ground points, comprising natural features distributed throughout the study area, were surveyed using GPS methods. In addition, RC30 film imagery and data from a lidar survey conducted using an Optech ALTM 2050 airborne laser scanner was also available for use in validation. The ADS40 imagery of the study area was processed using standard commercial software and a number of tests were conducted to geometrically assess the photogrammetric performance of imagery from the sensor at various stages throughout the photogrammetric workflow. Experiments examined the influence of ground control points (GCPs) in bundle block adjustment and the performance of digital elevation models (DEMs) resulting from the processing of ADS40 imagery. This independent research has permitted a series of initial conclusions to be drawn and preliminary recommendations to be made for optimum deployment of the ADS40 sensor under certain operational conditions. For example, it is shown that, despite advances made in direct positioning and orientation using integrated satellite and inertial surveying, the importing of GCPs into the block adjustment process remains a critical issue influencing the achievable accuracy during photogrammetric measurement. Copyright SFPT Numéro de notice : A2006-631 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueNat DOI : sans En ligne : https://www.isprs.org/proceedings/XXXVI/part1/Papers/PS3-34.pdf Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28354 [article]

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