Impacts of Noise on the Accuracy of Hyperspectral Image Classification by SVM

Peijun Du 1 +, Xiaomei Wang 1, Kun Tan 1 and Giles M. Foody 2 
1 China University of Mining and Technology, Xuzhou City, Jiangsu Province, 221116, China 
2  University of Nottingham, University Park, Nottingham NG7 2RD, UK

Abstract. The support vector machine (SVM) has become a popular tool for image classification recently. The performance of SVM for hyperspectral image classification has been examined from a range of perspectives, but the impacts of noise, errors and uncertainties have attracted less attention. This paper aims to evaluate the impacts of noise on SVM classification. The research is undertaken using real imagery acquired by the OMIS hyperspectral sensor. To assess the sensitivity and reduction capacity of SVM classifier to different types of noise a simulation study is undertaken using two types of noise. The first type of noise is striping, in which some rows or columns of the image have markedly abnormal signals. The second type of noise is caused by some uncertain factors that may impact upon one band, one pixel or one line. This noise may be evaluated by introducing salt and pepper noise. A variety of datasets containing different types of noise are generated and classified  using a SVM. The results of  the classifications, with particular regard to their accuracy, are compared  against a classification of the original dataset and comparative analyses obtained using traditional classifiers including the spectral angle mapper (SAM) and binary encoding (BE). The results indicate that the SVM  is more effective to alleviate the effects of noise than SAM and BE. 

Keywords: support vector machine (SVM), hyperspectral remote sensing, classification, noise.

In: Wan, Y. et al. (eds) Proceeding of the 8th international symposium on spatial accuracy assessment in natural resources and environmental sciences, World Academic Union (Press).

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