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Influence of Image Fusion Approaches on Classification Accuracy – A Case Study

Colditz, Rene and Wehrmann, Thilo and Bachmann, Martin and Steinnocher, Klaus and Schmidt, Michael and Strunz, Guenter and Dech, Stefan (2006) Influence of Image Fusion Approaches on Classification Accuracy – A Case Study. International Journal of Remote Sensing, 27 (15), pp. 3311-3335. Taylor and Francis. DOI: 10.1080/01431160600649254. ISSN 0143-1161.

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Abstract

While many studies in the field of image fusion of remotely sensed data aim towards deriving new algorithms for visual enhancement, there is little research on the influence of image fusion on other applications. One major application in earth science is land cover mapping. The concept of sensors with multiple spatial resolutions provides a potential for image fusion. It minimises errors of geometric alignment and atmospheric or temporal changes. This study focuses on the influence of image fusion on spectral classification algorithms and their accuracy. A Landsat 7 ETM+ image was used, where six multispectral bands (30 m) were fused with the corresponding 15m panchromatic channel. The fusion methods comprise rather common techniques like Brovey, hue-saturation-value transform, and principal component analysis, and more complex approaches, including adaptive image fusion, multisensor multiresolution image fusion technique, and wavelet transformation. Image classification was performed with supervised methods, e.g. maximum likelihood classifier, object-based classification, and support vector machines. The classification was assessed with test samples, a clump analysis, and techniques accounting for classification errors along land cover boundaries. It was found that the adaptive image fusion approach shows best results with low noise content. It resulted in a major improvement when compared with the reference, especially along object edges. Acceptable results were achieved by wavelet, multisensor multiresolution image fusion, and principal component analysis. Brovey and hue-saturationvalue image fusion performed poorly and cannot be recommended for classification of fused imagery.

Document Type:Article
Title:Influence of Image Fusion Approaches on Classification Accuracy – A Case Study
Authors:
AuthorsInstitution or Email of Authors
Colditz, ReneUNSPECIFIED
Wehrmann, ThiloUNSPECIFIED
Bachmann, MartinUNSPECIFIED
Steinnocher, KlausARC systems research
Schmidt, MichaelUNSPECIFIED
Strunz, GuenterUNSPECIFIED
Dech, StefanUNSPECIFIED
Date:10 August 2006
Journal or Publication Title:International Journal of Remote Sensing
Refereed publication:Yes
In ISI Web of Science:Yes
Volume:27
DOI:10.1080/01431160600649254
Page Range:pp. 3311-3335
Publisher:Taylor and Francis
ISSN:0143-1161
Status:Published
Keywords:Image fusion; Image analysis; Image classification; Classification accuracy; Land cover
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W EO - Erdbeobachtung
DLR - Research area:Space
DLR - Program:W EO - Erdbeobachtung
DLR - Research theme (Project):W - Vorhaben Geowissenschaftl. Fernerkundungs- und GIS-Verfahren (old)
Location: Oberpfaffenhofen
Institutes and Institutions:German Remote Sensing Data Center > Environment and Security > Environment and Geoinformation
Deposited By: Rene Colditz
Deposited On:04 Sep 2006
Last Modified:27 Apr 2009 13:03

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