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Approximate computing for onboard anomaly detection from hyperspectral images

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Abstract

Interest on anomaly detection for hyperspectral images has increasingly grown during the last decades due to the diversity of applications that benefit from this technique. However, the high computational cost inherent to this detection procedure seriously limits its processing efficiency, especially for onboard application scenarios. In this paper, a novel spectral and spatial approximate computing approach, named SSAC is proposed for onboard anomaly detection from hyperspectral images. To efficiently design the proposed approach, two preliminary aspects have been deeply analyzed in this work. First, data correlation in hyperspectral images in both spectral and spatial dimensions has been analyzed. The high data correlation in both spectral and spatial dimensions is considered to be one of the cornerstones of the SSAC approach. Second, the error resilience of a popular hyperspectral anomaly detection algorithm in both data level and algorithm level has been analyzed, which is considered to be another cornerstone of the SSAC approach. Based on the outcomes of this analysis, the processing of spectrally and spatially degraded images has been employed for reducing computation complexity in onboard hyperspectral anomaly detection scenarios in this work. Performance assessment tools such as ROC curves, Cost curves, and computing times have been used for evaluating the computing accuracy and efficiency of our proposal. The results obtained with a nonlinear anomaly detector for hyperspectral imagery, such as the well-known kernel RX-algorithm, show that the proposed SSAC approach greatly improves anomaly detection efficiency compared to the traditional method with negligible degeneration in accuracy. This is an important achievement to meet the restrictions of onboard hyperspectral anomaly detection scenarios.

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Acknowledgements

This work was supported by the Natural Science Foundation of China under Grants 91638201 and 41301384, and the National Key Research and Development Program of China under Grant 2016YFB0500304.

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Authors and Affiliations

  1. Key Laboratory of Digital Earth Science, Institute of Remote Sensing and Digital Earth, Chinese Academy of Sciences, Beijing, China

    Yuanfeng Wu, Bing Zhang & Lianru Gao

  2. Institute for Applied Microelectronics, University of Las Palmas de Gran Canaria, Campus of Tafira, Las Palmas de Gran Canaria, Spain

    Sebastián López

  3. Department of Electronic Engineering, Tsinghua University, Beijing, China

    Fei Qiao

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  1. Yuanfeng Wu
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  2. Sebastián López
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  3. Bing Zhang
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  4. Fei Qiao
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  5. Lianru Gao
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Correspondence to Lianru Gao.

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Wu, Y., López, S., Zhang, B. et al. Approximate computing for onboard anomaly detection from hyperspectral images. J Real-Time Image Proc 16, 99–114 (2019). https://doi.org/10.1007/s11554-018-0797-5

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