Improved classification of remote sensing imagery using image fusion techniques
Görüntü kaynaştırma yöntemleri kullanarak uzaktan algılanmış görüntülerin sınıflandırmalarının iyileştirilmesi
- Tez No: 715872
- Danışmanlar: PROF. DR. ALIN ACHIM, PROF. DR. NISHAN CANAGARAJAH
- Tez Türü: Doktora
- Konular: Jeodezi ve Fotogrametri, Geodesy and Photogrammetry
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 2013
- Dil: İngilizce
- Üniversite: University of Bristol
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Elektrik ve Elektronik Mühendisliği Ana Bilim Dalı
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: 163
Özet
Özet yok.
Özet (Çeviri)
Remote sensing is a quick and inexpensive way of gathering information about Earth. It enables one to constantly get updated information from satellite images for real-time local and global mapping of environmental changes. Current classification methods used for extracting relevant knowledge from this huge information pool are not very efficient because of the limited training samples and high dimensionality of the images. Information fusion is often used in order to improve the classification accuracy prior or after performing classification. However, these techniques cannot always successfully overcome the aforementioned issues. Therefore, in this thesis, new methods are introduced in order to increase the classification accuracy of remotely sensed data by means of information fusion techniques. This thesis is structured in three parts. In the first part, a novel pixel based image fusion is introduced to fuse optical and SAR image data in order to increase classification accuracy. Fused images obtained via conventional fusion methods may not contain enough information for subsequent processing such as classification or feature extraction. The proposed method aims to keep the maximum contextual and spatial information from the source data by exploiting the relationship between spatial domain cumulants and wavelet domain cumulants. The novelty of the method consists in integrating the relationship between spatial and wavelet domain cumulants of the source images into an image fusion process as well as in employing these wavelet cumulants for optimisation of weights in a Cauchy convolution based image fusion scheme. In the second part, a novel feature based image fusion method is proposed in order to increase the classification accuracy of hyperspectral images. An application of Empirical Mode Decomposition (EMD) to wavelet based dimensionality reduction is presented with an aim to generate the smallest set of features that leads to better classification accuracy compared to single techniques. Useful spectral information for hyperspectral image classification can be obtained by applying the Wavelet Transform (WT) to each hyperspectral signature. As EMD has the ability to describe short term spatial changes in frequencies, it helps to get a better understanding of the spatial information of the signal. In order to take advantage of both spectral and spatial information, a novel dimensionality reduction method is introduced, which relies on using the wavelet transform of EMD features. This leads to better class separability and hence to better classification. Finally, in the last part of the thesis, a novel decision based fusion is performed in order to increase the classification accuracy of previously introduced feature based image fusion method for hyperspectral image data sets. Each feature is independently classified by Support Vector Machines, creating a multiclassifier system. Then, classification results are fused using a decision fusion criterion to produce one final classification. The proposed method further increases the overall classification accuracy by independent classifiers when reduced number of features are employed compared to single stage classification.
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