Wavelet based spatial — Spectral hyperspectral image classification technique using Support Vector Machines

摘要

Classifying the heterogeneous classes present in the hyper spectral image is one of the recent research issues in the field of remote sensing. The classification accuracy can be improved if and only if both the feature extraction and classifier selection are proper. As the classes present in the hyper spectral image are having different textures, textural classification is entertained. Wavelet based textural feature extraction is entailed. As hyper spectral images are having dozen numbers of bands, few bands are selected and wavelet transform is applied. For each of the sub band Gray Level Co-occurrence Matrix (GLCM) are calculated. From GLCMs co-occurrence features are derived for individual pixels. Apart from Co-occurrence features, statistical features are also calculated. Addition of statistical and co-occurrence features of individual pixels at other individual bands form new features. By the process of adding these new features of approximation band and individual sub-bands at the pixel level, Combined Features are derived. These Combined Features are used for classification. Support Vector Machines with Binary Hierarchical Tree (BHT) classifier is developed to classify the data by One Against All(OAA) methodology. Airborne Visible Infra Red Imaging Sensor (AVIRIS) image of Cuprite — Nevada field is inducted for the experiment and the results are compared with the ground truth and with the maximum likelihood classifier output which available in HIAT toolbox.