13 August 2014 Hyperspectral band selection based on parallel particle swarm optimization and impurity function band prioritization schemes
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Abstract
In recent years, satellite imaging technologies have resulted in an increased number of bands acquired by hyperspectral sensors, greatly advancing the field of remote sensing. Accordingly, owing to the increasing number of bands, band selection in hyperspectral imagery for dimension reduction is important. This paper presents a framework for band selection in hyperspectral imagery that uses two techniques, referred to as particle swarm optimization (PSO) band selection and the impurity function band prioritization (IFBP) method. With the PSO band selection algorithm, highly correlated bands of hyperspectral imagery can first be grouped into modules to coarsely reduce high-dimensional datasets. Then, these highly correlated band modules are analyzed with the IFBP method to finely select the most important feature bands from the hyperspectral imagery dataset. However, PSO band selection is a time-consuming procedure when the number of hyperspectral bands is very large. Hence, this paper proposes a parallel computing version of PSO, namely parallel PSO (PPSO), using a modern graphics processing unit (GPU) architecture with NVIDIA’s compute unified device architecture technology to improve the computational speed of PSO processes. The natural parallelism of the proposed PPSO lies in the fact that each particle can be regarded as an independent agent. Parallel computation benefits the algorithm by providing each agent with a parallel processor. The intrinsic parallel characteristics embedded in PPSO are, therefore, suitable for parallel computation. The effectiveness of the proposed PPSO is evaluated through the use of airborne visible/infrared imaging spectrometer hyperspectral images. The performance of PPSO is validated using the supervised K-nearest neighbor classifier. The experimental results demonstrate that the proposed PPSO/IFBP band selection method can not only improve computational speed, but also offer a satisfactory classification performance.
© 2014 Society of Photo-Optical Instrumentation Engineers (SPIE)
Yang-Lang Chang, Yang-Lang Chang, Jin-Nan Liu, Jin-Nan Liu, Yen-Lin Chen, Yen-Lin Chen, Wen-Yen Chang, Wen-Yen Chang, Tung-Ju Hsieh, Tung-Ju Hsieh, Bormin Huang, Bormin Huang, } "Hyperspectral band selection based on parallel particle swarm optimization and impurity function band prioritization schemes," Journal of Applied Remote Sensing 8(1), 084798 (13 August 2014). https://doi.org/10.1117/1.JRS.8.084798 . Submission:
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