A New Spectral-Spatial Algorithm Method for Hyperspectral Image Target Detection
WANG Cai-ling1,2, WANG Hong-wei3, HU Bing-liang1, WEN Jia4, XU Jun5，LI Xiang-juan2
1. Xi’an Institute of Optics and Precision Mechanics of Chinese Academy of Sciences，Key Lab of Spectral Imaging, Xi’an 710119, China 2. Xi’an Shiyou University, School of Computer Science, Xi’an 710065, China 3. Engineering University of the Chinese People’s Armed Police Force，Xi’an 710086, China 4. Institute of Software of Chinese Academy of Sciences, Beijing 100080, China 5. School of Information Engineering, East China Jiaotong Univeristy, Nanchang 330013, China
Abstract：With high-resolution spatial information and continuous spectrum information, hyperspectral remote sensing image -has a unique advantage in the field of target detection. Traditional hyperspectral remote sensing image target detection methods emphasis on using spectral information to determine deterministic algorithm and statistical algorithms. Deterministic algorithms find the target by calculating the distance between the target spectrum and detected spectrum however, they are unable to detect sub-pixel target and are easily affected by noise. Statistical methods which calculate background statistical characteristics to detect abnormal point as target. It can detect subpixel target targets and small targets better thanbig size target,. With the spatial resolution increasing, subpixel target detection target has gradually grown to a single pixel and multi-pixel target. At this point, hyperspectral image usually has large homogeneous regions where the neighboring pixels wihin the regions consist of the same type of materials and have a similar spectral characteristics, therefore, the spatial information should be needed to incorporate into the algorithm for targe detection. This paper proposes an algorithm for hyperspectral target detection combined spectrum characteristics and spatial characteristics. The algorithm is based on traditional target detection operator and combined neighborhood clustering statistics. Firstly, the algorithm uses target detection operator to divided hyperspectral image into a potential target region and background region. Then, it calculates the centroid of the potential target area. Finally, as the centroid for neighborhood clustering center to clust data in order to exclud background from potential target area, through iterative calculation to obtain the final results of the target detection. The traditional statistics algorithms defines the total image as background area in order to extract background statistics features, and the algorithm propsed devided the total image into background part and potential target part, which cut off the target interference for background statistics feature extraction. Compared with CEM operators and ACE operators, the algorithm proposed outperforms than traditional operators in big target detection .
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