Centre de documentation
scientifique

Dépouillements

Sensor modeling, self-calibration and accuracy testing of panoramic cameras and laser scanners / J. Amiri Parian in ISPRS Journal of photogrammetry and remote sensing, vol 65 n° 1 (January - February 2010)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 65 n° 1 (January - February 2010) . - pp 60 - 76 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 terrestre Résumé : (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 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
081-2010011	SL	Revue	Centre de documentation	Revues en salle	Disponible

Seam-line determination for image mosaicking: a technique minimizing the maximum local mismatch and the global cost / J. Chon in ISPRS Journal of photogrammetry and remote sensing, vol 65 n° 1 (January - February 2010)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 65 n° 1 (January - February 2010) . - pp 86 - 92 Titre : Seam-line determination for image mosaicking: a technique minimizing the maximum local mismatch and the global cost Type de document : Article/Communication Auteurs : J. Chon, Auteur ; H. Kim, Auteur ; C. Lin, Auteur Année de publication : 2010 Article en page(s) : pp 86 - 92 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] algorithmique [Termes IGN] mosaïquage d'images [Termes IGN] recherche du chemin optimal, algorithme de Résumé : (Auteur) This paper presents a novel algorithm that selects seam-lines for mosaicking image patches. This technique uses Dijkstra’s algorithm to find a seam-line with the minimal objective function. Since a segment of seam-line with significant mismatch, even if it is short, is more visible than a lengthy one with small differences, a direct summation of the mismatch scores is inadequate. Limiting the level of the maximum difference along a seam-line should be part of the objective in the seam-line selection process. Our technique first determines this desired level of maximum difference, then applies Dijkstra’s algorithm to find the best seam-line. A quantitative measure to evaluate a seam-line is proposed. The measure is defined as the sum of a fixed number of top mismatch scores. The proposed algorithm is compared with other techniques quantitatively and visually about various types of images. Numéro de notice : A2010-231 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2009.09.001 En ligne : https://doi.org/10.1016/j.isprsjprs.2009.09.001 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30425 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
081-2010011	SL	Revue	Centre de documentation	Revues en salle	Disponible

Terrestrial laser scanner self-calibration: correlation sources and their mitigation / Derek D. Lichti in ISPRS Journal of photogrammetry and remote sensing, vol 65 n° 1 (January - February 2010)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 65 n° 1 (January - February 2010) . - pp 93 - 102 Titre : Terrestrial laser scanner self-calibration: correlation sources and their mitigation Type de document : Article/Communication Auteurs : Derek D. Lichti, Auteur Année de publication : 2010 Article en page(s) : pp 93 - 102 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] acquisition de données [Termes IGN] auto-étalonnage [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] étalonnage d'instrument [Termes IGN] télémètre laser terrestre Résumé : (Auteur) Instrument calibration is recognised as an important process to assure the quality of data captured with a terrestrial laser scanner. While the self-calibration approach can provide optimal estimates of systematic error parameters without the need for specialised equipment or facilities, its success is somewhat hindered by high correlations between model variables. This paper presents the findings of a detailed study into the sources of correlation in terrestrial laser scanner self-calibration for a basic additional parameter set. Several pertinent outcomes, resulting from experiments conducted with simulated data, and 12 real calibration datasets captured with a Faro 880 terrestrial laser scanner, are presented. First, it is demonstrated that panoramic-type scanner self-calibration from only two instrument locations is possible so long as the scans have orthogonal orientation in the horizontal plane. Second, the importance of including scanner tilt angle observations in the adjustment for parameter de-correlation is demonstrated. Third, a new network measure featuring an asymmetric distribution of object points that does not rely upon a priori observation of the instrument position is proposed. It is shown to be an effective means to reduce the correlation between the rangefinder offset and the scanner position parameters. Fourth, the roles of several other influencing variables on parameter correlation are revealed. The paper concludes with a set of recommended design measures to reduce parameter correlation in terrestrial laser scanner self-calibration. Numéro de notice : A2010-232 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2009.09.002 En ligne : https://doi.org/10.1016/j.isprsjprs.2009.09.002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30426 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
081-2010011	SL	Revue	Centre de documentation	Revues en salle	Disponible

Modelling vertical error in LiDAR-derived digital elevation models / F. Aguilar in ISPRS Journal of photogrammetry and remote sensing, vol 65 n° 1 (January - February 2010)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 65 n° 1 (January - February 2010) . - pp 103 - 110 Titre : Modelling vertical error in LiDAR-derived digital elevation models Type de document : Article/Communication Auteurs : F. Aguilar, Auteur ; Jon Mills, Auteur ; J. Delgado, Auteur ; et al., Auteur Année de publication : 2010 Article en page(s) : pp 103 - 110 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] données lidar [Termes IGN] données localisées 3D [Termes IGN] interpolation inversement proportionnelle à la distance [Termes IGN] lasergrammétrie [Termes IGN] modèle d'erreur [Termes IGN] modèle numérique de surface Résumé : (Auteur) A hybrid theoretical–empirical model has been developed for modelling the error in LiDAR-derived digital elevation models (DEMs) of non-open terrain. The theoretical component seeks to model the propagation of the sample data error (SDE), i.e. the error from light detection and ranging (LiDAR) data capture of ground sampled points in open terrain, towards interpolated points. The interpolation methods used for infilling gaps may produce a non-negligible error that is referred to as gridding error. In this case, interpolation is performed using an inverse distance weighting (IDW) method with the local support of the five closest neighbours, although it would be possible to utilize other interpolation methods. The empirical component refers to what is known as “information loss”. This is the error purely due to modelling the continuous terrain surface from only a discrete number of points plus the error arising from the interpolation process. The SDE must be previously calculated from a suitable number of check points located in open terrain and assumes that the LiDAR point density was sufficiently high to neglect the gridding error. For model calibration, data for 29 study sites, 200*200 m in size, belonging to different areas around Almeria province, south-east Spain, were acquired by means of stereo photogrammetric methods. The developed methodology was validated against two different LiDAR datasets. The first dataset used was an Ordnance Survey (OS) LiDAR survey carried out over a region of Bristol in the UK. The second dataset was an area located at Gador mountain range, south of Almería province, Spain. Both terrain slope and sampling density were incorporated in the empirical component through the calibration phase, resulting in a very good agreement between predicted and observed data (R2=0.9856;p Numéro de notice : A2010-233 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2009.09.003 En ligne : https://doi.org/10.1016/j.isprsjprs.2009.09.003 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30427 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
081-2010011	SL	Revue	Centre de documentation	Revues en salle	Disponible

Assessment of terrain elevation derived from satellite laser altimetry over mountainous forest areas using airborne lidar data / Q. Chen in ISPRS Journal of photogrammetry and remote sensing, vol 65 n° 1 (January - February 2010)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 65 n° 1 (January - February 2010) . - pp 111 - 122 Titre : Assessment of terrain elevation derived from satellite laser altimetry over mountainous forest areas using airborne lidar data Type de document : Article/Communication Auteurs : Q. Chen, Auteur Année de publication : 2010 Article en page(s) : pp 111 - 122 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Lasergrammétrie [Termes IGN] décomposition de Gauss [Termes IGN] données altimétriques [Termes IGN] données ICEsat [Termes IGN] données lidar [Termes IGN] forêt [Termes IGN] modèle numérique de surface [Termes IGN] montagne Résumé : (Auteur) Gaussian decomposition has been used to extract terrain elevation from waveforms of the satellite lidar GLAS (Geoscience Laser Altimeter System), on board ICESat (Ice, Cloud, and land Elevation Satellite). The common assumption is that one of the extracted Gaussian peaks, especially the lowest one, corresponds to the ground. However, Gaussian decomposition is usually complicated due to the broadened signals from both terrain and objects above over sloped areas. It is a critical and pressing research issue to quantify and understand the correspondence between Gaussian peaks and ground elevation. This study uses not, vert, similar2000 km2 airborne lidar data to assess the lowest two GLAS Gaussian peaks for terrain elevation estimation over mountainous forest areas in North Carolina. Airborne lidar data were used to extract not only ground elevation, but also terrain and canopy features such as slope and canopy height. Based on the analysis of a total of not, vert, similar500 GLAS shots, it was found that (1) the lowest peak tends to underestimate ground elevation; terrain steepness (slope) and canopy height have the highest correlation with the underestimation, (2) the second to the lowest peak is, on average, closer to the ground elevation over mountainous forest areas, and (3) the stronger peak among the lowest two is closest to the ground for both open terrain and mountainous forest areas. It is expected that this assessment will shed light on future algorithm improvements and/or better use of the GLAS products for terrain elevation estimation. Numéro de notice : A2010-234 Affiliation des auteurs : non IGN Thématique : FORET/IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2009.09.004 En ligne : https://doi.org/10.1016/j.isprsjprs.2009.09.004 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30428 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
081-2010011	SL	Revue	Centre de documentation	Revues en salle	Disponible

Augmented reality and photogrammetry: a synergy to visualize physical and virtual city environments / Cristina Portales in ISPRS Journal of photogrammetry and remote sensing, vol 65 n° 1 (January - February 2010)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 65 n° 1 (January - February 2010) . - pp 134 - 142 Titre : Augmented reality and photogrammetry: a synergy to visualize physical and virtual city environments Type de document : Article/Communication Auteurs : Cristina Portales, Auteur ; L. Lerma, Auteur ; S. Navarro, Auteur Année de publication : 2010 Article en page(s) : pp 134 - 142 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] appareil portable [Termes IGN] modèle 3D de l'espace urbain [Termes IGN] monde virtuel [Termes IGN] photogrammétrie métrologique [Termes IGN] réalité augmentée [Termes IGN] temps réel [Termes IGN] ville Résumé : (Auteur) Close-range photogrammetry is based on the acquisition of imagery to make accurate measurements and, eventually, three-dimensional (3D) photo-realistic models. These models are a photogrammetric product per se. They are usually integrated into virtual reality scenarios where additional data such as sound, text or video can be introduced, leading to multimedia virtual environments. These environments allow users both to navigate and interact on different platforms such as desktop PCs, laptops and small hand-held devices (mobile phones or PDAs). In very recent years, a new technology derived from virtual reality has emerged: Augmented Reality (AR), which is based on mixing real and virtual environments to boost human interactions and real-life navigations. The synergy of AR and photogrammetry opens up new possibilities in the field of 3D data visualization, navigation and interaction far beyond the traditional static navigation and interaction in front of a computer screen. In this paper we introduce a low-cost outdoor mobile AR application to integrate buildings of different urban spaces. High-accuracy 3D photo-models derived from close-range photogrammetry are integrated in real (physical) urban worlds. The augmented environment that is presented herein requires for visualization a see-through video head mounted display (HMD), whereas user’s movement navigation is achieved in the real world with the help of an inertial navigation sensor. After introducing the basics of AR technology, the paper will deal with real-time orientation and tracking in combined physical and virtual city environments, merging close-range photogrammetry and AR. There are, however, some software and complex issues, which are discussed in the paper. Numéro de notice : A2010-235 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2009.10.001 En ligne : https://doi.org/10.1016/j.isprsjprs.2009.10.001 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30429 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
081-2010011	SL	Revue	Centre de documentation	Revues en salle	Disponible

Automatic change detection of buildings in urban environment from very high spatial resolution images using existing geodatabase and prior knowledge / M. Bouziani in ISPRS Journal of photogrammetry and remote sensing, vol 65 n° 1 (January - February 2010)  

Public [article]  inISPRS Journal of photogrammetry and remote sensing > vol 65 n° 1 (January - February 2010) . - pp 143 - 153 Titre : Automatic change detection of buildings in urban environment from very high spatial resolution images using existing geodatabase and prior knowledge Type de document : Article/Communication Auteurs : M. Bouziani, Auteur ; Kalifa Goïta, Auteur ; D. He, Auteur Année de publication : 2010 Article en page(s) : pp 143 - 153 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Télédétection [Termes IGN] base de données cartographiques [Termes IGN] détection automatique [Termes IGN] détection de changement [Termes IGN] détection du bâti [Termes IGN] image à très haute résolution [Termes IGN] image Ikonos [Termes IGN] image Quickbird [Termes IGN] milieu urbain [Termes IGN] Québec (Canada) [Termes IGN] Rabat (Maroc) Résumé : (Auteur) The updating of geodatabases (GDB) in urban environments is a difficult and expensive task. It may be facilitated by an automatic change detection method. Several methods have been developed for medium and low spatial resolution images. This study proposes a new method for change detection of buildings in urban environments from very high spatial resolution images (VHSR) and using existing digital cartographic data. The proposed methodology is composed of several stages. The existing knowledge on the buildings and the other urban objects are first modelled and saved in a knowledge base. Some change detection rules are defined at this stage. Then, the image is segmented. The parameters of segmentation are computed thanks to the integration between the image and the geodatabase. Thereafter, the segmented image is analyzed using the knowledge base to localize the segments where the change of building is likely to occur. The change detection rules are then applied on these segments to identify the segments that represent the changes of buildings. These changes represent the updates of buildings to be added to the geodatabase. The data used in this research concern the city of Sherbrooke (Quebec, Canada) and the city of Rabat (Morocco). For Sherbrooke, we used an Ikonos image acquired in October 2006 and a GDB at the scale of 1:20,000. For Rabat, a QuickBird image acquired in August 2006 has been used with a GDB at the scale of 1:10,000. The rate of good detection is 90%. The proposed method presents some limitations on the detection of the exact contours of the buildings. It could be improved by including a shape post-analysis of detected buildings. The proposed method could be integrated into a cartographic update process or as a method for the quality assessment of a geodatabase. It could be also be used to identify illegal building work or to monitor urban growth. Numéro de notice : A2010-236 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1016/j.isprsjprs.2009.10.002 En ligne : https://doi.org/10.1016/j.isprsjprs.2009.10.002 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30430 [article]

Exemplaires(1)

Code-barres	Cote	Support	Localisation	Section	Disponibilité
081-2010011	SL	Revue	Centre de documentation	Revues en salle	Disponible