  Hyperspectral image (HSI) classification is an important task in many
applications, such as environmental monitoring, medical imaging, and land
use/land cover (LULC) classification. Due to the significant amount of spectral
information from recent HSI sensors, analyzing the acquired images is
challenging using traditional Machine Learning (ML) methods. As the number of
frequency bands increases, the required number of training samples increases
exponentially to achieve a reasonable classification accuracy, also known as
the curse of dimensionality. Therefore, separate band selection or
dimensionality reduction techniques are often applied before performing any
classification task over HSI data. In this study, we investigate recently
proposed subspace learning methods for one-class classification (OCC). These
methods map high-dimensional data to a lower-dimensional feature space that is
optimized for one-class classification. In this way, there is no separate
dimensionality reduction or feature selection procedure needed in the proposed
classification framework. Moreover, one-class classifiers have the ability to
learn a data description from the category of a single class only. Considering
the imbalanced labels of the LULC classification problem and rich spectral
information (high number of dimensions), the proposed classification approach
is well-suited for HSI data. Overall, this is a pioneer study focusing on
subspace learning-based one-class classification for HSI data. We analyze the
performance of the proposed subspace learning one-class classifiers in the
proposed pipeline. Our experiments validate that the proposed approach helps
tackle the curse of dimensionality along with the imbalanced nature of HSI
data.
