title: A Weighted Spatial-Spectral Kernel RX Algorithm and Efficient Implementation on GPUs.
abstract: The kernel RX (KRX) detector proposed by Kwon and Nasrabadi exploits a kernel function to obtain a better detection performance. However, it still has two limits that can be improved. On the one hand, reasonable integration of spatial-spectral information can be used to further improve its detection accuracy. On the other hand, parallel computing can be used to reduce the processing time in available KRX detectors. Accordingly, this paper presents a novel weighted spatial-spectral kernel RX (WSSKRX) detector and its parallel implementation on graphics processing units (GPUs). The WSSKRX utilizes the spatial neighborhood resources to reconstruct the testing pixels by introducing a spectral factor and a spatial window, thereby effectively reducing the interference of background noise. Then, the kernel function is redesigned as a mapping trick in a KRX detector to implement the anomaly detection. In addition, a powerful architecture based on the GPU technique is designed to accelerate WSSKRX. To substantiate the performance of the proposed algorithm, both synthetic and real data are conducted for experiments.
authors.affiliation: College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China. zhaochunhui@hrbeu.edu.cn.
authors.forename: Chunhui
authors.initials: C
authors.lastname: Zhao
authors.affiliation: College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China. hgcljw@gmail.com.
authors.forename: Jiawei
authors.initials: J
authors.lastname: Li
authors.affiliation: College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China. meilingmeng@hrbeu.edu.cn.
authors.forename: Meiling
authors.initials: M
authors.lastname: Meng
authors.affiliation: College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China. xf.yao1020@gmail.com.
authors.forename: Xifeng
authors.initials: X
authors.lastname: Yao
keywords: anomaly detection; graphics processing units (GPUs); hyperspectral imaging; kernel mapping; parallel processing; spatial-spectral information