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Graph-based feature selection for object-oriented classification in VHR airborne imagery / Tianen Chen in IEEE Transactions on geoscience and remote sensing, vol 49 n° 1 Tome 2 (January 2011)  

Public [article]  inIEEE Transactions on geoscience and remote sensing > vol 49 n° 1 Tome 2 (January 2011) . - pp 353 - 365 Titre : Graph-based feature selection for object-oriented classification in VHR airborne imagery Type de document : Article/Communication Auteurs : Tianen Chen, Auteur ; Tian Fang, Auteur ; H. Huo, Auteur ; D. Li, Auteur Année de publication : 2011 Article en page(s) : pp 353 - 365 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Traitement d'image [Termes IGN] classification dirigée [Termes IGN] classification orientée objet [Termes IGN] extraction de traits caractéristiques [Termes IGN] graphe [Termes IGN] image à ultra haute résolution [Termes IGN] image aérienne [Termes IGN] Kappa de Cohen [Termes IGN] matrice [Termes IGN] pondération [Termes IGN] similitude [Termes IGN] voisinage (relation topologique) Résumé : (Auteur) Linearly nonseparability and class imbalance of very high resolution (VHR) imagery make feature selection for object-oriented classification quite challenging, while such characteristics, especially class imbalance, have usually been ignored in open literature. To cope with the challenges, this paper proposes a new graph-based feature selection method named locally weighted discriminating projection (LWDP). First, the popular graph-based criteria of feature selection are reformulated to present linear or nonlinear mapping in feature space. Second, weight matrices of graphs characterize dissimilarity rather than similarity between pairwise neighbors, to well-preserved local structure when the difference of distance between a sample and its neighbors is large. Finally, LWDP provides a new perspective to alleviate class imbalance at both global and local levels, by restricting the pairwise relationships in the weight matrices. Specifically, neighborhood unions are introduced to employ the local class distribution and class size to constrain pairwise relationships in the weight matrices when classifying unbalanced sample sets. To evaluate the performances of LWDP in low dimensions, a holistic scoring scheme is proposed to stress the performances under low dimensions. In addition, overall accuracy curves and Kappa Index of Agreement (KIA) curves, which exhibit KIA in dimensions, are also used. The experimental results show that LWDP and its kernel extension outperform the other classic or latest methods in processing unbalanced sample set of VHR airborne imagery. Numéro de notice : A2011-051 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1109/TGRS.2010.2054832 Date de publication en ligne : 12/08/2010 En ligne : https://doi.org/10.1109/TGRS.2010.2054832 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=30832 [article]

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A rigorous laboratory calibration method for interior orientation of an airborne linear push-broom camera / Tianen Chen in Photogrammetric Engineering & Remote Sensing, PERS, vol 73 n° 4 (April 2007)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 73 n° 4 (April 2007) . - pp 369 - 374 Titre : A rigorous laboratory calibration method for interior orientation of an airborne linear push-broom camera Type de document : Article/Communication Auteurs : Tianen Chen, Auteur ; Ryosuke Shibasaki, Auteur ; Z. Lin, Auteur Année de publication : 2007 Article en page(s) : pp 369 - 374 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] étalonnage de chambre métrique [Termes IGN] étalonnage radiométrique [Termes IGN] étalonnage spectral [Termes IGN] image à haute résolution [Termes IGN] limite de résolution géométrique [Termes IGN] orientation interne Résumé : (Auteur) The linear push-broom camera is one of the most important imaging systems in modern photogrammetry and remote sensing to collect high-resolution digital panchromatic and multispectral images for comprehensive evaluation of natural resources and environmental conditions. Most commercial high-resolution satellites such as SPOT-5, Ikonos-2, and QuickBird use similar sensors. Airborne sensors such as the ADS40 and STARIMAGER® also use the push-broom approach to collect multi-channel, seamless image strips for linear objects such as roads, railways, rivers, seashores, electric power lines, pipe lines, and high-rise building areas. Other commercial hyperspectral sensors also use the push-broom approach to collect digital images for remote sensing applications. High performance linear cameras require high resolution geometric, spectral, and radiometric calibration. This topic has not been covered in the scientific literature. Although the self-calibration is successful to compute the calibration parameters of frame camera, it is denied in our tests since the linear camera’s calibrated parameters are dependent on the accuracy of on-board GPS/IMU position and attitude data. In this paper, a rigorous calibration method is presented. This approach has been successfully used in our developed airborne three-line scanner (TLS) imaging system STARIMAGER® in the last five years. The method can accurately compute TLS’s focal length, principle point location, lens distortion, CCD pixel size, CCD curve deformation, and convergence angles between each CCD line sensor on the focal plane. Without any modification, it can be directly applied to single linear sensors and multi-linear sensors. Copyright ASPRS Numéro de notice : A2007-141 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.73.4.369 En ligne : https://doi.org/10.14358/PERS.73.4.369 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=28504 [article]

A wavelet transform based for road centerline extraction / Tianen Chen in Photogrammetric Engineering & Remote Sensing, PERS, vol 70 n° 12 (December 2004)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 70 n° 12 (December 2004) . - pp 1423 - 1431 Titre : A wavelet transform based for road centerline extraction Type de document : Article/Communication Auteurs : Tianen Chen, Auteur ; Jing Wang, Auteur ; K. Zhang, Auteur Année de publication : 2004 Article en page(s) : pp 1423 - 1431 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Photogrammétrie numérique [Termes IGN] axe médian [Termes IGN] données localisées 2D [Termes IGN] extraction automatique [Termes IGN] extraction du réseau routier [Termes IGN] image à haute résolution [Termes IGN] magnitude [Termes IGN] transformation en ondelettes Résumé : (Auteur) This paper introduces a new wavelet transform based method of road centerline extraction from high resolution remote sensing images. In the one dimensional case, we characterize different kinds of sudden changes of signals by comparing f the magnitudes of the local extreme values of the wavelet transforms under different dilation scales of the same wavelet. The platform-like signals, which come from cross sections of roads, can be characterized through the evolution of the wavelet transform across scales. A two-dimensional wavelet transform of an image consists of two components, each component is a one dimensional wavelet transform in one coordinate direction followed by a smoothing process in the perpendicular direction. The road edges can be characterized through the evolution of the two-dimensional wavelet transform across different scales. Edges of the main roads can then be extracted using these characterizations, and the road centerlines can be obtained by proper post-processing. Numéro de notice : A2004-504 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.70.12.1423 En ligne : https://doi.org/10.14358/PERS.70.12.1423 Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=27021 [article]

Development and calibration of the airborne three-line scanner (TLS) imaging system / Tianen Chen in Photogrammetric Engineering & Remote Sensing, PERS, vol 69 n° 1 (January 2003)  

Public [article]  inPhotogrammetric Engineering & Remote Sensing, PERS > vol 69 n° 1 (January 2003) . - pp 71 - 78 Titre : Development and calibration of the airborne three-line scanner (TLS) imaging system Type de document : Article/Communication Auteurs : Tianen Chen, Auteur ; Ryosuke Shibasaki, Auteur ; M. Shunji, Auteur Année de publication : 2003 Article en page(s) : pp 71 - 78 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Vedettes matières IGN] Acquisition d'image(s) et de donnée(s) [Termes IGN] capteur aérien [Termes IGN] capteur en peigne [Termes IGN] capteur optique [Termes IGN] chambre DTC [Termes IGN] étalonnage de capteur (imagerie) [Termes IGN] étalonnage radiométrique [Termes IGN] hélicoptère [Termes IGN] image optique [Termes IGN] modélisation géométrique de prise de vue Résumé : (Auteur) The Airborne Three-Line-Scanner (TLS) imaging system has provided proof of the concept of stereo and multispectral mapping using the pushbroom mode because frame digital imaging systems with comparable coverage and resolution have not been available and are not likely to be available in the future. A prototype of the TLS system, the STARIMAGER, was developed jointly in 2000 by the STARLABO Corporation of japan and the University of Tokyo and is introduced in this paper. A laboratory method and algorithm to evaluate the optical characteristics of STARIMAGER are presented. The principle is to measure the object-space angles of a sufficient number of CCD elements in two directions as seen through the optics. These angular measurements reflect the real camera geometry of both the optics and the GCD arrays. A mathematical model based on the central perspective projection has been constructed to estimate the focal length, principle point, and lens distortion of the optics and the alignment errors of the CCD sensors in the focal plane. These calibration parameters have been used in several real test flights, and ground point determination accuracies from 0,03 to 0.08-m (0.5- to 1.5-pixels) in planimetry and from 0.06- to 0.15-m (1.2 to 3-pixels) in elevation from a flying height of 500 m were attained. Numéro de notice : A2003-003 Affiliation des auteurs : non IGN Thématique : IMAGERIE Nature : Article DOI : 10.14358/PERS.69.1.71 En ligne : https://doi.org/10.14358/PERS.69.1.71 Format de la ressource électronique : URL article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=22301 [article]